Nuisance

Parts I through VIII of this volume have been concerned with the internal architecture of ownership: what interests may exist in land, who holds them, how they are created, how they are shared, and how they are transferred. Part IX turns outward. It asks how the law constrains the exercise of an owner's rights in the interest of neighbours and of the public. Nuisance is the oldest of those constraints and the only one that is purely judicial in origin; zoning and the law of regulatory takings, treated in Chapters 29 and 30, are the public-law successors that grew up alongside it.

The subject of this chapter is therefore the conflict of lawful uses. Chapter 21 established that an easement gives one owner an affirmative right in the land of another, and Chapter 23 established that a covenant may restrict how land is used by private agreement. Nuisance operates where there is neither easement nor covenant: it supplies a default law of neighbourhood, imposed by courts, that limits what an owner may do on his own land when the consequences travel across the boundary.

1. Private nuisance protects use and enjoyment, not possession. Trespass redresses an invasion of the right of exclusive possession; nuisance redresses a non-trespassory interference with the use and enjoyment of land. Restatement (Second) of Torts § 821D.
2. The interference must be both substantial and unreasonable. Substantiality is measured by the effect on a normal person in the community; unreasonableness is a separate inquiry, and neither element alone establishes liability. Restatement (Second) of Torts § 822.
3. Substantiality is judged by an objective standard. The hypersensitive plaintiff and the unusually delicate use recover nothing that an ordinary occupant of ordinary land would not recover — the doctrine sometimes called the rule against protecting “extraordinary sensitiveness.”
4. Liability rests on intent, negligence, or abnormally dangerous activity. “Intentional” in nuisance means only that the actor knows the invasion results or is substantially certain to result from his conduct; it does not require a desire to harm. Restatement (Second) of Torts § 825.
5. An intentional invasion is unreasonable when the gravity of the harm outweighs the utility of the conduct. Restatement (Second) of Torts §§ 826(a), 827, 828 supply the factors on each side of the balance.
6. The Restatement adds an independent “serious harm and feasible compensation” test. Under § 826(b) an invasion may be unreasonable, though the conduct's utility exceeds the harm, where the harm is serious and the financial burden of compensating for it would not make the activity infeasible. Not every jurisdiction has adopted § 826(b).
7. Locality matters. What is a nuisance in a residential quarter may be no nuisance in an industrial one; the character of the locality informs both substantiality and unreasonableness, but it is a factor and not a licence.
8. Public nuisance is a different wrong with a different plaintiff. It is an unreasonable interference with a right common to the general public, historically a criminal offence and now defined by Restatement (Second) of Torts § 821B; it need not involve land at all.
9. A private plaintiff suing on a public nuisance must show special injury. The harm must differ in kind, not merely in degree, from that suffered by the public generally. Restatement (Second) of Torts § 821C.
10. The same facts may constitute both a private and a public nuisance. The categories are not exclusive, and pleading both is ordinary practice where the interference affects both a particular occupant and the public at large.
11. Coming to the nuisance is a factor, not a defence. Priority of occupation is evidence bearing on reasonableness and on the equities of injunctive relief; the majority rule rejects it as an absolute bar. Restatement (Second) of Torts § 840D.
12. A prescriptive right to maintain a private nuisance may be acquired. The invasion must be actual, open, notorious, continuous, and adverse for the limitations period, on the principles developed in Chapter 21; no prescriptive right may be acquired to maintain a public nuisance.
13. Compliance with a zoning ordinance or permit does not immunize a nuisance. Public regulation sets a floor, not a ceiling; only an express legislative authorization of the very activity in the very manner conducted supplies the defence of legislative authority, and even then generally only as to injunctive relief.
14. The injunction is not automatic. Equity balances the equities and may withhold an injunction where the hardship to the defendant and the public grossly exceeds the benefit to the plaintiff, awarding permanent damages instead. Boomer v. Atlantic Cement Co., 257 N.E.2d 870 (N.Y. 1970).
15. Permanent damages measure the diminution in market value caused by the continuing invasion. An award of permanent damages ordinarily bars future actions for the same continuing nuisance and operates in substance as a compulsory servitude.
16. Temporary nuisances are compensated by lost rental or use value. The distinction between a temporary and a permanent nuisance controls both the measure of damages and the running of the statute of limitations.
17. A court may enjoin a nuisance yet require the plaintiff to indemnify the defendant. Spur Industries, Inc. v. Del E. Webb Development Co., 494 P.2d 700 (Ariz. 1972), is the leading American authority for the compensated injunction.
18. Nuisance liability may attach without any physical invasion. Noise, odour, vibration, light, and the fear generated by an adjoining use may all support liability, whereas obstruction of light, air, or view generally does not in American law absent an easement or statute.

1. Define private nuisance and distinguish it from trespass to land, from negligence, and from the covenants and servitudes treated in Chapters 21 through 23.
2. State the two elements of a private nuisance — substantial interference and unreasonableness — and explain why each is independently necessary.
3. Classify a defendant's conduct as intentional, negligent, reckless, or abnormally dangerous for the purposes of Restatement (Second) of Torts § 822, and explain the distinctive meaning of intent in nuisance.
4. Apply the gravity-utility balance of §§ 826(a), 827, and 828 to a conflict of neighbouring uses, identifying the factors on each side.
5. Distinguish the § 826(a) balancing test from the § 826(b) serious-harm test and identify the practical consequence of adopting one or both.
6. Analyze the role of locality, priority of occupation, and social value in determining unreasonableness.
7. Define public nuisance under § 821B and identify the circumstances in which a private party has standing under the special-injury rule of § 821C.
8. Trace the historical development of nuisance from the assize of nuisance and the action on the case to the modern Restatement formulation.
9. Evaluate the defences of prescription, legislative authority, statutory compliance, right-to-farm protection, and consent, and identify the limits of each.
10. Compare the remedial options — injunction, permanent damages, temporary damages, self-help abatement, and the compensated injunction — and predict which a court will select.
11. Distinguish temporary from permanent nuisances and apply the distinction to damages and to limitations.
12. Identify the interaction between nuisance and public land use regulation, and explain why compliance with zoning does not extinguish nuisance liability.
13. Analyze the relationship among nuisance, the law of servitudes, and the takings doctrine treated in Chapter 30, including the role of nuisance in the Lucas background-principles inquiry.

• Restatement (Second) of Torts §§ 821A–821F (definitions; public and private nuisance; standing) (Am. L. Inst. 1979).
• Restatement (Second) of Torts §§ 822, 825, 826, 827, 828, 829, 829A, 831 (basis of liability; unreasonableness) (Am. L. Inst. 1979).
• Restatement (Second) of Torts §§ 840C–840E (contributory conduct; coming to the nuisance; prescription) (Am. L. Inst. 1979).
• Restatement (Second) of Torts §§ 930, 933, 941 (permanent damages; injunctions; balancing) (Am. L. Inst. 1979).
• Restatement (Third) of Property: Servitudes §§ 1.2, 3.1 (Am. L. Inst. 2000) (private ordering as an alternative to nuisance).
• Statute of Westminster II, 13 Edw. 1, c. 24 (1285) (Eng.) (in consimili casu; the action on the case).
• Aldred's Case, 77 Eng. Rep. 816 (K.B. 1610).
• St. Helen's Smelting Co. v. Tipping, 11 Eng. Rep. 1483 (H.L. 1865).
• Sturges v. Bridgman, (1879) 11 Ch. D. 852 (Eng. C.A.).
• Bamford v. Turnley, 122 Eng. Rep. 27 (Ex. Ch. 1862).
• Rylands v. Fletcher, (1868) L.R. 3 H.L. 330 (Eng.).
• Georgia v. Tennessee Copper Co., 206 U.S. 230 (1907).
• Madison v. Ducktown Sulphur, Copper & Iron Co., 83 S.W. 658 (Tenn. 1904).
• Estancias Dallas Corp. v. Schultz, 500 S.W.2d 217 (Tex. Civ. App. 1973).
• Boomer v. Atlantic Cement Co., 257 N.E.2d 870 (N.Y. 1970).
• Spur Industries, Inc. v. Del E. Webb Development Co., 494 P.2d 700 (Ariz. 1972).
• Prah v. Maretti, 321 N.W.2d 182 (Wis. 1982).
• Fontainebleau Hotel Corp. v. Forty-Five Twenty-Five, Inc., 114 So. 2d 357 (Fla. Dist. Ct. App. 1959).
• Morgan v. High Penn Oil Co., 77 S.E.2d 682 (N.C. 1953).
• Village of Euclid v. Ambler Realty Co., 272 U.S. 365 (1926) (nuisance as the conceptual origin of zoning).
• Lucas v. South Carolina Coastal Council, 505 U.S. 1003 (1992) (background principles of nuisance and property law).
• State right-to-farm statutes (all fifty states; contents vary materially).

• Sir Edward Coke, The First Part of the Institutes of the Laws of England §§ 200–201 (Co. Litt. 56a–57a) (nuisance and the assize).
• 3 William Blackstone, Commentaries on the Laws of England *216–*222 (private wrongs: nuisance).
• 3 James Kent, Commentaries on American Law *438–*441 (nuisance in the American reception).
• 2 Frederick Pollock & Frederic William Maitland, The History of English Law Before the Time of Edward I, bk. II, ch. IX (2d ed. 1898).
• Sir John Baker, An Introduction to English Legal History chs. 21–22 (5th ed. 2019).
• A. W. B. Simpson, Victorian Law and the Industrial Spirit (1995); Leading Cases in the Common Law ch. 7 (1995).
• 6 Herbert Thorndike Tiffany, The Law of Real Property §§ 693–712 (3d ed. 1939).
• 9 Richard R. Powell, Powell on Real Property ch. 64 (Michael Allan Wolf ed.).
• Stoebuck & Whitman, The Law of Property §§ 7.2–7.5 (3d ed. 2000).
• W. Page Keeton et al., Prosser and Keeton on the Law of Torts §§ 86–91 (5th ed. 1984).
• Guido Calabresi & A. Douglas Melamed, Property Rules, Liability Rules, and Inalienability: One View of the Cathedral, 85 Harv. L. Rev. 1089 (1972).
• Ronald H. Coase, The Problem of Social Cost, 3 J.L. & Econ. 1 (1960).

Every parcel of land is bounded, but the consequences of using land are not. Smoke, noise, odour, vibration, water, dust, and light cross boundaries as a matter of physical necessity, and the activities that generate them are, considered in isolation, lawful exercises of ownership. The law of nuisance exists because the exercise of ownership by one is capable of destroying the value of ownership by another, and because the maxim sic utere tuo ut alienum non laedas, standing alone, decides nothing: it states the problem in the form of a conclusion.

Nuisance therefore performs a function that no other doctrine in this volume performs. Servitudes, treated in Part VII, allocate use rights between neighbours by private agreement or by conduct amounting to prescription or implication; where the parties have created an easement or a covenant, that instrument governs. Nuisance supplies the law that applies when they have not. It is the default law of neighbourhood, imposed by courts, and it is for that reason both indispensable and irreducibly evaluative.

Two features distinguish nuisance from the doctrines already studied. First, it is relational in the strong sense: the wrong consists not in the defendant's conduct considered alone but in the relation between that conduct and the plaintiff's use of nearby land. The identical activity may be actionable in one location and unimpeachable in another. Second, it is remedial in a way that ordinary property doctrine is not: the court determines not only whether a right has been infringed but what the appropriate remedial response is, and it may conclude that the right exists and that the defendant may nevertheless continue on payment.

This chapter treats nuisance as a property subject rather than as a chapter of tort law, though it belongs to both. The property emphasis is deliberate: nuisance determines the practical content of ownership at the boundary, it supplies the background principles against which regulatory takings are measured under Lucas, and it furnished the conceptual justification on which comprehensive zoning was upheld in Euclid. Chapters 29 and 30 develop those points.

The earliest remedy was the assize of nuisance, a real action available to a freeholder against the freeholder of neighbouring land who had erected or maintained something to the injury of the plaintiff's free tenement. Pollock and Maitland trace the assize to the twelfth century and emphasize its close structural affinity with the assize of novel disseisin: both were possessory, both protected seisin, and the assize of nuisance addressed injuries falling short of dispossession — the diverted watercourse, the obstructed way, the raised dam, the encroaching wall.

The limits of the assize were jurisdictional rather than conceptual. It lay only between freeholders, only where the parties held of neighbouring tenements, and only for a nuisance to the free tenement itself. Lessees, licensees, and those injured by activities on distant land had no remedy. The judgment was likewise limited: abatement of the nuisance and damages, with the sheriff empowered to remove the offending structure.

The Statute of Westminster II (1285), which authorized the clerks in Chancery to frame writs in consimili casu, supplied the mechanism by which the action on the case for nuisance developed. By the sixteenth century the action on the case had substantially displaced the assize, because it was available to a wider class of plaintiffs, was not confined to injuries to the free tenement, and did not require the technical apparatus of a real action. Baker describes the transition as a characteristic instance of the migration of medieval real actions into the flexible framework of case.

Aldred's Case, 77 Eng. Rep. 816 (K.B. 1610), marks the maturity of the older law. The plaintiff complained of a hog-sty erected near his house, whose stench rendered the dwelling unusable. The court held the action lay, rejecting the defendant's argument that the law protects only tangible interests: “it is not necessary that the air be corrupted, but it is sufficient that it be made less wholesome.” In the same case the court held that an action would not lie for the mere obstruction of a prospect, a holding whose modern American descendant is the rule denying protection to light, air, and view discussed at § 28.13.

The doctrine acquired its modern shape in the nineteenth century, when industrial production placed heavy manufacturing beside residential settlement on a scale the older law had never contemplated. Two English decisions define the resulting framework.

Bamford v. Turnley, 122 Eng. Rep. 27 (Ex. Ch. 1862), rejected the proposition that the public benefit of an activity is a defence to liability for the harm it inflicts on a particular neighbour. Baron Bramwell's opinion articulated what has become the standard justification of nuisance liability: an activity is properly regarded as beneficial only if it can bear the cost of the harm it causes, and “the public consists of all the individuals of it,” so that the profitable enterprise must compensate those on whom its costs fall. The reasoning anticipates by a century the analysis of Calabresi and Melamed and of Coase.

St. Helen's Smelting Co. v. Tipping, 11 Eng. Rep. 1483 (H.L. 1865), supplied the distinction that has governed ever since. The Lord Chancellor separated nuisances producing “material injury to property” from those producing mere “personal discomfort.” In the former class the character of the locality is no answer; in the latter it is central, for a person who lives in a manufacturing district must accept the ordinary incidents of that district. The distinction survives in American law, chiefly as a rule of emphasis: physical damage to land is very difficult to justify by reference to locality, while intangible interference is evaluated against local conditions.

Sturges v. Bridgman, (1879) 11 Ch. D. 852, completed the framework by holding that the plaintiff physician's construction of a consulting room adjacent to the defendant confectioner's long-established mortars did not deprive him of relief, and that no prescriptive right had been acquired because the noise had not been actionable — and therefore had not been adverse — until the consulting room was built. The case is the classical source of the American rule that coming to the nuisance is not a bar, and of the proposition that a prescriptive right can be acquired only by conduct that was actionable throughout the period.

American courts absorbed this learning with a distinctive emphasis on the economics of development. Madison v. Ducktown Sulphur, Copper & Iron Co., 83 S.W. 658 (Tenn. 1904), refused an injunction against copper smelting that had destroyed the vegetation of an entire valley, on the ground that the value of the plaintiffs' farms was trivial beside the value of the industry and the livelihood of the community; damages alone were awarded. Georgia v. Tennessee Copper Co., 206 U.S. 230 (1907), reached the opposite conclusion at the suit of a sovereign State asserting a quasi-sovereign interest in its forests and air, Justice Holmes holding that a State “has the last word as to whether its mountains shall be stripped of their forests.” The pairing illustrates the enduring tension in the remedial law of nuisance.

Restatement (Second) of Torts § 821D defines a private nuisance as “a nontrespassory invasion of another's interest in the private use and enjoyment of land.” Each element of that definition carries weight. The invasion must be nontrespassory, which distinguishes nuisance from trespass; it must affect the use and enjoyment of land, which distinguishes it from personal injury simpliciter; and the interest invaded must be private, which distinguishes it from public nuisance.

The interest protected belongs to the possessor. A tenant in possession may sue, and indeed is the ordinary plaintiff; the reversioner may sue only where the injury is of a permanent character affecting the value of the reversion. This allocation follows directly from the leasehold analysis of Chapters 25 and 27: the leasehold is an estate, the tenant holds the present possessory interest, and the interference is with that interest. A licensee or a mere occupant without a possessory interest generally has no standing in private nuisance, though a family member of the possessor may recover for personal harms as a derivative matter in many jurisdictions.

The kinds of interference recognized are diverse and are limited only by the requirement of substantiality. Odour, smoke, dust, noise, vibration, artificial light, heat, insects, water, and the deposit of particulate matter are the classical categories. Interferences that are purely aesthetic, or that consist in the emotional response of neighbours to a lawful use, are actionable in a minority of jurisdictions and only where the response is that of a normal person and the effect on marketability is demonstrable.

Liability is not confined to owners. The person who creates the nuisance is liable; so is the possessor who maintains or permits its continuation after knowledge; and a landlord may be liable where the nuisance was contemplated by the lease or existed at the commencement of the term. A vendor who conveys land on which a nuisance exists remains liable for a reasonable period after conveyance, until the vendee has had opportunity to discover and abate it.

The classical distinction is between an invasion of the right of exclusive possession, which is trespass, and an interference with the use and enjoyment of land, which is nuisance. Trespass requires an intentional entry, is actionable per se without proof of damage, and is subject to a mechanical rather than an evaluative standard of liability. Nuisance requires substantial harm, requires unreasonableness, and calls for judgment rather than measurement.

Modern cases have complicated the distinction by permitting trespass claims for microscopic particulates and for intangibles such as sound waves and electromagnetic radiation. The better and majority view requires, for trespass, an invasion by something with mass that causes actual and substantial damage; a claim for airborne particulates that causes no measurable physical damage sounds in nuisance and not in trespass. The distinction matters for four practical reasons: the requirement of damage, the applicable limitations period, the availability of nominal damages, and the treatment of the plaintiff's sensitivity.

The distinction also matters for the character of the right. Trespass vindicates the boundary as such and expresses the exclusion principle established in Chapter 3. Nuisance vindicates a quality of the enjoyment of land and necessarily accepts some level of mutual interference as the price of neighbourhood — the notion of “give and take, live and let live” in the English cases, and of ordinary use in the Restatement's treatment of substantiality.

Substantiality is the threshold element and is objective. Restatement (Second) of Torts § 821F confines liability to invasions causing “significant harm, of a kind that would be suffered by a normal person in the community or by property in normal condition and used for a normal purpose.” The doctrine performs the function of screening out the trivial and the idiosyncratic before any balancing occurs.

Two corollaries follow. The first is the rule against protecting extraordinary sensitiveness: the plaintiff whose particular medical condition, unusually delicate manufacturing process, or exceptionally sensitive equipment renders him vulnerable to an interference that would not trouble an ordinary occupant recovers nothing. The classical illustration is the drive-in cinema whose screen is impaired by ordinary street lighting, and the modern one is the sensitive electronic instrument disturbed by an ordinary industrial field.

The second is the rule that substantiality is measured against the community. The inquiry is not what this plaintiff finds objectionable but what an ordinary member of the community, occupying this land for an ordinary purpose, would find materially disruptive. Evidence of the reactions of other neighbours is therefore admissible and often decisive, and the absence of any complaint from other occupants is powerful evidence that the threshold is unmet.

Substantiality is not the same as unreasonableness, and the two must not be collapsed. An interference may be plainly substantial — a smelter that destroys vegetation for miles — and the question of unreasonableness remains open, as Madison v. Ducktown demonstrates. Conversely an interference may be unreasonable in the sense of being pointless or malicious and yet fall below the threshold of substantiality, in which case there is no nuisance, though the spite-fence statutes discussed at § 28.13 may supply an independent remedy.

Restatement (Second) of Torts § 822 provides that liability for a private nuisance attaches where the invasion is either (a) intentional and unreasonable, or (b) unintentional and otherwise actionable under the rules governing negligent, reckless, or abnormally dangerous conduct. Nuisance is therefore not a distinct basis of liability but a distinct kind of harm, to which the ordinary bases of tort liability are applied.

Intent in this context bears a special and frequently misunderstood meaning. Under § 825 an invasion is intentional if the actor acts for the purpose of causing it or knows that it is resulting or is substantially certain to result from his conduct. A factory operator who has been notified that his emissions are settling on a neighbour's land, and who continues to operate, is intentionally invading, however blameless his motives and however carefully he operates. Morgan v. High Penn Oil Co., 77 S.E.2d 682 (N.C. 1953), states the point squarely: the oil refinery's continued operation after complaint made the invasion intentional, and the absence of negligence was immaterial.

The practical consequence is that nearly all litigated nuisance cases involving continuing activity are intentional-invasion cases, because notice arrives with the plaintiff's first complaint. The unintentional branch of § 822 is therefore reserved chiefly for single-episode invasions — the escape of a chemical, the collapse of an embankment, the isolated release — where the plaintiff must prove negligence, recklessness, or the abnormally dangerous character of the activity.

The relation between nuisance and Rylands v. Fletcher, (1868) L.R. 3 H.L. 330, belongs here. Rylands, decided as a case about a non-natural user of land whose escape caused damage, is the ancestor of the American doctrine of strict liability for abnormally dangerous activities. Where such an activity produces a continuing interference with neighbouring land, both doctrines are available, and the plaintiff who proceeds in nuisance under § 822(b) takes the benefit of the strict-liability standard without proof of unreasonableness in the balancing sense.

Where the invasion is intentional, liability turns on unreasonableness, and § 826(a) supplies the primary test: the invasion is unreasonable if the gravity of the harm outweighs the utility of the actor's conduct. The inquiry is comparative and is conducted on the facts as they stand, not in the abstract.

Section 827 enumerates the factors bearing on the gravity of the harm: the extent of the harm; its character, physical damage weighing more heavily than discomfort; the social value of the use invaded; the suitability of that use to the character of the locality; and the burden on the person harmed of avoiding the harm. Section 828 enumerates the factors bearing on utility: the social value of the actor's conduct; the suitability of the conduct to the character of the locality; and the impracticability of preventing or avoiding the invasion.

Two of these factors deserve emphasis. Suitability to locality appears on both sides of the balance, which is the Restatement's method of expressing the St. Helen's Smelting insight in modern form: a use that is out of place is disadvantaged whichever party maintains it. Impracticability of avoidance is the factor that most often decides commercial cases, because a defendant who can abate at modest cost will rarely be found to be acting reasonably in declining to do so, whatever the utility of the underlying activity.

Section 826(b) adds a second and independent route to unreasonableness. An invasion is unreasonable, even where the utility of the conduct exceeds the gravity of the harm, if the harm is serious and the financial burden of compensating for this and similar harms to others would not make the continuation of the conduct infeasible. This provision converts the inquiry from whether the activity should continue into whether it should pay, and it is the doctrinal foundation of the permanent-damages remedy adopted in Boomer. It is important to state accurately that § 826(b) is not universal American law: a substantial number of jurisdictions apply the § 826(a) balance alone, and in those jurisdictions a defendant whose utility exceeds the plaintiff's harm prevails outright.

Section 829A supplies a related rule of considerable practical importance: an intentional invasion is unreasonable if the harm is severe and greater than the plaintiff should be required to bear without compensation. Section 829 provides that an invasion is unreasonable where the actor's sole purpose is to cause harm or where the conduct is contrary to common standards of decency, and it is the Restatement's expression of the spite-nuisance principle.

The character of the locality is the single most influential contextual factor in the law of nuisance, and it operates at three points: in determining whether the interference is substantial to a normal occupant, in weighing the suitability of each party's use, and in shaping the remedy. A foundry in a foundry district is in its place; the same foundry beside a residential terrace is not.

The locality principle is nevertheless bounded. St. Helen's Smelting confines it to interferences producing discomfort rather than physical damage, and American courts have preserved that limitation in substance: physical injury to land or to crops is rarely excused by the industrial character of a district. Nor does the locality principle permit the defendant to define the locality by his own operations; the relevant character is that established by the general pattern of use, not by the defendant's own contribution to it.

Priority of occupation is a distinct question, though it is often confused with locality. That the defendant's activity preceded the plaintiff's arrival is relevant evidence — it bears on the suitability of each use to the district and on the equities of an injunction — but under Restatement (Second) of Torts § 840D it is not a bar. Sturges v. Bridgman is the classical authority and the reasoning is instructive: if priority were a defence, the first occupant of every district would acquire by mere occupation a perpetual power to determine the permissible uses of all surrounding land, without paying for it and without the notice that recording provides.

The doctrine known in the American cases as “coming to the nuisance” is therefore properly stated as a factor. Where the plaintiff has purchased at a price discounted for the existing condition, where the defendant's activity is well established and heavily capitalized, and where the district is genuinely characterized by that activity, courts commonly deny an injunction while allowing damages, or grant an injunction on terms. Spur Industries, treated at § 28.20, is the leading illustration of relief conditioned upon the plaintiff's indemnification of a defendant who was there first.

Public nuisance is a wrong of a different order. Restatement (Second) of Torts § 821B defines it as “an unreasonable interference with a right common to the general public,” and it originated not in the law of property but in the criminal law: the purpresture and the common nuisance were offences against the Crown, prosecuted because they injured the public rather than any identifiable proprietor.

Because the right invaded is public, the wrong need not involve land at all, and the plaintiff need own none. Obstruction of a public highway or navigable waterway, pollution of a public water supply, the keeping of a disorderly house, the storage of explosives in a populated area, and the maintenance of a condition dangerous to public health are the classical instances. Section 821B(2) identifies the circumstances bearing on unreasonableness: whether the conduct significantly interferes with public health, safety, peace, comfort, or convenience; whether it is proscribed by statute or regulation; and whether it is of a continuing nature and has produced a permanent or long-lasting effect that the actor knows or should know is significant.

The ordinary plaintiff is a public officer or public body suing on behalf of the community, and the ordinary remedy is abatement or injunction, frequently supplemented by statutory penalties. Many jurisdictions declare particular conditions to be public nuisances by statute, and such a declaration ordinarily establishes the interference conclusively while leaving remedy and standing to the general law.

Public nuisance has become the vehicle for a substantial body of modern mass litigation — actions concerning firearms, opioids, lead paint, and climate change — and the results have been sharply divided. The recurring objections are that the interference alleged is not with a right common to the public in the traditional sense, that the defendant lacks control over the instrumentality at the time of the harm, and that the theory displaces the law of products liability. This litigation lies outside the property law of the subject, but the practitioner should not assume that the traditional doctrine extends to it.

A private person may recover damages for a public nuisance only on proof of harm “of a kind different from that suffered by other members of the public exercising the right common to the general public that was the subject of interference.” Restatement (Second) of Torts § 821C(1). The rule is ancient and its rationale is administrative: without it, a single obstruction of a highway would generate an indefinite multiplicity of actions by everyone inconvenienced.

The requirement is one of difference in kind, not degree. That the plaintiff was delayed longer than others, or suffered a larger share of the general inconvenience, does not suffice. Physical harm to the person, physical damage to chattels or to land, and pecuniary loss peculiar to the plaintiff's business — the classical case being the riparian commercial fisherman whose livelihood is destroyed by a pollutant that merely inconveniences the public — do suffice. Loss of custom by a shop rendered inaccessible by an obstruction is the standard American illustration of pecuniary special injury.

Section 821C(2) states the position as to injunctive relief: a private person may maintain a proceeding to enjoin a public nuisance if he can recover damages under subsection (1), or has authority as a public official or public agency, or has standing to sue as a representative of the general public, as a citizen in a citizen's action, or as a member of a class in a class action. Statutory citizen-suit provisions in environmental legislation have made the third route the practically important one in many jurisdictions.

Where the same facts injure both the public and a particular occupant of land, the plaintiff ordinarily pleads both public and private nuisance. The two theories are not exclusive, and the private count avoids the special-injury requirement altogether, since it rests on the invasion of the plaintiff's own interest in the use and enjoyment of land.

Courts frequently distinguish a nuisance per se — an activity or condition that is a nuisance at all times and in all circumstances, regardless of location or manner of operation — from a nuisance per accidens, or nuisance in fact, which is a nuisance only by reason of its location, surroundings, or manner of conduct. The distinction is procedural in effect: a nuisance per se is established as a matter of law, while a nuisance per accidens requires the evidentiary inquiry set out in Part II.

The category of nuisance per se is narrow and consists largely of activities unlawful in themselves and of conditions declared to be nuisances by statute or ordinance. Lawful businesses conducted in a lawful manner are, with rare exception, not nuisances per se, however unwelcome they may be to neighbours; the funeral home, the quarry, the feedlot, and the refinery are all in the second category and must be evaluated on the facts.

The distinction is worth stating because it is frequently misapplied. A determination that an activity is not a nuisance per se decides nothing about whether it is a nuisance in fact, and a defendant who establishes the lawfulness of his enterprise has not thereby established a defence. Conversely, a statutory declaration that a condition constitutes a nuisance does not automatically confer standing on a private plaintiff, who must still satisfy the special-injury rule if the declared nuisance is public.

American law has generally declined to protect access to light, air, and prospect through the law of nuisance. The rule descends from the holding in Aldred's Case that no action lies for a mere obstruction of a view, and from the American refusal to receive the English doctrine of ancient lights, which permitted an easement of light to be acquired by prescription. Chapter 21 explained the reasoning: an easement of light acquired by mere passage of time would burden every parcel adjoining an established building and would obstruct development without compensation or record notice.

Fontainebleau Hotel Corp. v. Forty-Five Twenty-Five, Inc., 114 So. 2d 357 (Fla. Dist. Ct. App. 1959), is the leading modern American statement. The court refused to enjoin the construction of a tower that would cast a winter shadow across a neighbouring hotel's swimming pool, holding that a landowner has no legal right to the free flow of light and air across adjoining land, and that the defendant's alleged spite was immaterial where the structure served a useful purpose.

Prah v. Maretti, 321 N.W.2d 182 (Wis. 1982), marks the principal American departure. The Wisconsin Supreme Court held that the obstruction of sunlight reaching a neighbour's solar collectors could constitute a private nuisance to be evaluated under the ordinary Restatement standard, reasoning that the policies underlying the old rule — the priority of unimpeded development and the treatment of sunlight as merely aesthetic — had been displaced by the energy value of solar access. Prah remains a minority position, and several courts have expressly declined to follow it; a number of States have addressed the subject instead by solar-access statutes and by permitting solar easements to be created and recorded under the servitudes principles of Chapter 21.

Two qualifications complete the picture. First, spite fences and structures erected solely to injure a neighbour are actionable in most jurisdictions, either at common law under the principle of § 829 or under spite-fence statutes limiting the height of boundary structures erected without utility. Second, purely aesthetic objections — to the appearance of a building, to a colour scheme, to the accumulation of unattractive but harmless materials — are ordinarily not actionable in nuisance, and are the proper subject of the private servitudes of Chapter 23 or the public regulation of Chapter 29.

Because liability in nuisance turns on an evaluative standard, most matters raised as “defences” are in truth arguments bearing on the elements. Locality, priority, the social utility of the enterprise, and the plaintiff's ability to avoid the harm all operate within the balance rather than outside it. Four matters, however, operate as true defences: prescription, consent, legislative authority, and, in a qualified way, statutory immunity of the right-to-farm type.

Contributory conduct occupies an intermediate position. Under Restatement (Second) of Torts § 840B, contributory negligence is a defence only where the plaintiff's claim rests on the negligence branch of § 822(b); it is no defence to an intentional invasion. Assumption of risk is likewise available only in the corresponding circumstances, and the general adoption of comparative fault has diminished the significance of both.

A defendant may acquire by prescription the right to maintain what would otherwise be a private nuisance. The requirements are those developed in Chapter 21 for prescriptive easements: the invasion must be actual, open and notorious, continuous, and adverse, and must persist for the statutory limitations period applicable to actions for the recovery of land.

Two features are distinctive. First, the invasion must have been actionable throughout the prescriptive period. Sturges v. Bridgman holds that time does not run while the interference causes no legal injury, because there is then nothing the plaintiff could have sued upon and nothing adverse to his rights; the confectioner's decades of noise availed him nothing once the consulting room made the noise actionable. Second, the prescriptive right is measured by the invasion actually maintained. A right acquired by twenty years of operating a two-furnace foundry does not authorize a ten-furnace foundry, and an intensification of the invasion is a fresh nuisance.

No prescriptive right may be acquired to maintain a public nuisance. The rationale is that the public cannot lose its rights by the laches of its officers, and the rule is uniform. Where a condition is both a public and a private nuisance, prescription may bar the private claim while leaving the public claim entirely unaffected.

Consent is a complete defence to the extent of the consent given. It may be express, as in a lease or a recorded agreement permitting a specified operation, or implied from the plaintiff's conduct. Where the consent is intended to be permanent and to bind successors, the proper instrument is a servitude created and recorded under the principles of Chapters 21 and 23; a bare oral consent binds only the consenting party and is revocable as a licence.

Legislative authority is a narrow defence. Where a legislature has expressly authorized the very activity complained of, and has authorized it in the manner in which it is conducted, the activity may not be enjoined as a nuisance, on the principle that a court will not enjoin what the legislature has directed. The defence has traditionally been asserted by railroads, public utilities, and municipal undertakings. Its limits are important: it does not extend to negligent operation, it does not extend to consequences beyond those necessarily incident to the authorized activity, and in the United States it does not generally bar an action for damages, since to allow a public undertaking to inflict uncompensated harm would raise the takings questions treated in Chapter 30.

Compliance with a zoning ordinance, permit, or environmental standard is not a defence. This is among the most frequently misunderstood propositions in the subject, and it must be stated without qualification: a public regulatory regime prescribes a minimum standard of conduct and does not confer a private licence to injure a neighbour. A rendering plant operating in a district zoned for heavy industry, holding every permit its emissions require, remains liable in nuisance if its odours substantially and unreasonably interfere with the use of neighbouring land. The permit is evidence bearing on the reasonableness of the operation and on the suitability of the use to the locality; it is not immunity.

The converse proposition is equally settled: a violation of a zoning ordinance or an environmental standard does not establish a nuisance. It is evidence of unreasonableness under § 821B(2)(b) for public nuisance and is relevant to the private balance, but the plaintiff must still prove substantial interference with his own use and enjoyment. The two systems of control are related and independent, and Chapter 29 develops the point from the public-law side.

Every American State has enacted legislation limiting nuisance liability for agricultural operations. The statutes were a response to suburban expansion into farming districts and to the perceived injustice of allowing later-arriving residents to displace long-established agriculture through litigation. In substance they convert the coming-to-the-nuisance factor into a statutory defence within defined limits.

The statutes differ materially and must be read individually. Recurring variables include the period of prior operation required before protection attaches, ordinarily one year; whether protection is lost by a substantial change in the nature or size of the operation; whether protection extends to operations that have expanded into new activities such as concentrated animal feeding; whether compliance with generally accepted agricultural practices is a condition; whether the statute bars injunctive relief, damages, or both; and whether the statute applies to public as well as private nuisance.

Constitutional challenges have divided the courts. Where a right-to-farm statute has been construed to extinguish a neighbour's pre-existing right to be free of a substantial interference, some courts have held that the statute effects a taking of an easement in the neighbour's land without compensation; others have upheld the statutes as ordinary adjustments of the relations between neighbours within the legislature's power. The practitioner must therefore verify both the statutory text and its constitutional treatment in the jurisdiction.

Analogous immunities exist for other activities: shooting ranges, motorsport facilities, airports, and industrial parks are protected by statute in various States, generally on the same structural pattern of prior operation, compliance with standards, and loss of protection on material change.

Nuisance is distinctive among the doctrines of this volume in that the determination of liability does not determine the remedy. A plaintiff who establishes a substantial and unreasonable interference has established a wrong; whether that wrong is redressed by an injunction terminating the activity, by damages leaving it in place, or by some combination is a further question decided in equity.

The analytical framework most commonly used to describe the choice is that of Calabresi and Melamed. An entitlement protected by a property rule may be taken from the holder only with his consent, and the injunction is its expression; an entitlement protected by a liability rule may be taken on payment of a judicially determined price, and damages are its expression. Four combinations are possible: the plaintiff protected by injunction, the plaintiff protected by damages, the defendant privileged outright, and the defendant privileged on payment of compensation to the plaintiff. All four appear in the American case law, the fourth in Spur Industries.

The traditional starting position in equity is that a plaintiff who proves a continuing nuisance and irreparable injury is entitled to an injunction; damages at law are inadequate where the interference is continuing, because they would require successive actions. That starting position is displaced where the balance of equities is grossly disproportionate.

Where an injunction is sought, courts balance the hardship the injunction would impose on the defendant and the public against the benefit to the plaintiff. Estancias Dallas Corp. v. Schultz, 500 S.W.2d 217 (Tex. Civ. App. 1973), states the requirement clearly and holds that the balancing must actually be conducted: the court affirmed an injunction against an apartment air-conditioning installation, noting that the cost of relocation, though substantial, was modest beside the destruction of the plaintiffs' residential enjoyment, and that no public interest in the continuation of the nuisance had been shown.

Madison v. Ducktown illustrates the opposite outcome. The Tennessee court refused an injunction that would have closed the copper industry of an entire region, awarding damages instead; the disproportion between the value of the plaintiffs' farms and the economic life of the community was treated as decisive. The decision is a standing warning that the injunction is discretionary, and that the plaintiff who declines a reasonable settlement in the confidence that equity must close the defendant's plant may recover far less than expected.

Where an injunction issues, its terms are frequently qualified rather than absolute. Courts commonly enjoin the manner rather than the activity — limiting hours of operation, requiring specified abatement equipment, prescribing buffer plantings and enclosures, capping emissions or noise at measured levels — and retain jurisdiction to supervise compliance. Such a decree is the ordinary and preferable disposition where the defendant's activity is socially valuable and the interference is capable of technical control.

A conditional or postponed injunction is a further variant: the court declares that the activity must cease by a stated date unless abatement is accomplished, leaving the defendant to choose between investment and closure. Boomer employed a variant of this technique before settling upon permanent damages.

Boomer v. Atlantic Cement Co., 257 N.E.2d 870 (N.Y. 1970), is the leading American authority on the substitution of damages for an injunction. Neighbouring landowners established that dust, smoke, and vibration from a cement plant representing an investment of some forty-five million dollars and employing over three hundred persons constituted a nuisance. The New York Court of Appeals accepted the finding of nuisance and the traditional rule that an injunction should follow, but declined to apply it, holding that the disparity between the plaintiffs' damages and the consequences of closure was too great. It granted an injunction to be vacated upon payment of permanent damages compensating the plaintiffs for the total economic loss to their property, present and future.

The court's reasoning was candid about the institutional limits of adjudication: the general problem of industrial air pollution required a legislative and regulatory solution, and a private lawsuit between particular neighbours was an unsuitable vehicle for imposing it. Judge Jasen's dissent objected that the majority had licensed a continuing wrong for a fee and had, in substance, granted the defendant a private power of eminent domain over the plaintiffs' land.

The consequence of an award of permanent damages should be stated precisely. The award compensates for all present and future injury from the continuing nuisance as conducted, and it bars further actions by the plaintiff and, in the usual formulation, by successors in title. It therefore operates as a servitude in substance: the defendant acquires the right to continue the invasion, and the burden runs with the plaintiff's land. Careful decrees provide for the recording of the judgment so that purchasers take with notice under the recording principles of Chapters 31 and 32.

Spur Industries, Inc. v. Del E. Webb Development Co., 494 P.2d 700 (Ariz. 1972), completes the remedial spectrum. A large cattle feedlot had operated in a rural area for years when a residential developer built a retirement community toward it, eventually placing thousands of residents within range of the flies and odour. The Arizona Supreme Court held the feedlot to be both a public and a private nuisance and enjoined it — but, because the developer had brought the population to the nuisance for its own profit, required the developer to indemnify the feedlot for the reasonable cost of moving or shutting down. The decision is the leading American example of the fourth Calabresi-Melamed rule and is the most explicit judicial recognition that the coming-to-the-nuisance factor may be given effect through the remedy rather than through liability.

The distinction between a temporary and a permanent nuisance controls both the measure of damages and the operation of the statute of limitations. A nuisance is temporary where it is abatable — where the interference may be discontinued or corrected at reasonable cost — and permanent where the condition is fixed, of indefinite duration, and not reasonably abatable.

For a temporary nuisance the measure is the loss of use during the period of the interference: the diminution in rental value of the premises, together with special damages such as the cost of repairs, lost profits proved with reasonable certainty, and compensation for discomfort and annoyance where the jurisdiction permits it. Each continuance is a fresh injury, so that a new cause of action accrues with each and the plaintiff may recover for the period within the limitations window however long the condition has existed.

For a permanent nuisance the measure is the diminution in the market value of the land, and the cause of action accrues once, when the permanent character of the invasion becomes apparent. The plaintiff who delays beyond the limitations period from that date is barred entirely. The rule creates a genuine trap, because the characterization is made by the court after the fact; the prudent course where the character of the condition is doubtful is to sue within the shorter period.

Damages for personal discomfort, annoyance, and inconvenience are recoverable in most jurisdictions in addition to the property measure, on the footing that they represent the very interference with use and enjoyment that the action protects; a minority confine recovery to the property measure. Punitive damages are available on the ordinary standard where the defendant persisted in the invasion with conscious disregard of the plaintiff's rights after notice.

The common law permitted a person injured by a nuisance to abate it himself, and the privilege survives in narrow form. Its conditions are strict: the abatement must be reasonably necessary, must be preceded by notice and a demand to abate except in cases of emergency, must be accomplished without a breach of the peace, and must inflict no more damage than the abatement requires. Entry upon the defendant's land for the purpose is privileged only within those limits.

The privilege is disfavoured in modern law for the same reasons that self-help repossession of leased premises is disfavoured, as Chapter 27 explained in connection with Berg v. Wiley: it invites violence and substitutes private judgment for adjudication in a matter that turns on an evaluative standard. A person who abates on a mistaken view that a condition is a nuisance is liable in trespass, and one who exceeds what abatement requires is liable for the excess.

The one setting in which self-help remains routine is the encroaching tree or root, where the majority rule permits an adjoining owner to cut back branches and roots to the boundary line at his own expense, without notice, provided he does not destroy the tree or enter the neighbour's land. A substantial number of jurisdictions have supplemented this with a rule permitting an action where the encroachment causes actual and substantial damage.

Three systems govern the use of land in relation to neighbours, and the practitioner must know which is engaged. Private servitudes, developed in Chapters 21 through 23, allocate use rights by agreement, are recorded, run with the land on stated conditions, and are enforced according to their terms. Nuisance operates by default where no servitude exists, is unrecorded and therefore unknowable in advance, and is enforced according to a standard rather than a rule. Public land use regulation, treated in Chapter 29, operates prospectively and generally, is administered rather than adjudicated, and is enforced by the municipality.

The systems differ most sharply in predictability. A recorded covenant tells a purchaser precisely what may and may not be done; a zoning ordinance tells him what the district permits; nuisance tells him only that he must not substantially and unreasonably interfere with his neighbours, a proposition whose application to his intended use he cannot know until it is litigated. This is the principal practical argument for private ordering and for regulation, and it explains why the developer of a subdivision imposes a covenant scheme rather than relying on the general law.

They also differ in who bears the burden of inaction. Under a covenant scheme the party who wishes to depart from the plan must obtain a release or a variance from the association; under nuisance the party who objects must sue. Under zoning the party who wishes to depart must apply to the municipality, and the objector's role is participatory rather than adjudicative.

Nuisance nevertheless retains functions the other systems cannot perform. It reaches harms that no draftsman anticipated and no ordinance addresses; it binds parties who never agreed and lands never brought within a scheme; and it supplies, under Lucas v. South Carolina Coastal Council, 505 U.S. 1003 (1992), the “background principles of the State's law of property and nuisance” against which a total regulatory deprivation of economic value is tested. Chapter 30 develops that function. A use that was always a nuisance under state law was never part of the owner's title, and its prohibition therefore takes nothing.

Each illustration identifies the interests involved, the governing doctrine, the common-law baseline, any statutory modification, the likely result, and the principal jurisdictional qualification.

Nuisance practice is dominated by evidence and by remedial strategy. The elements are evaluative, so the case is generally won by the party with the better record of measured facts and the better account of what abatement would cost.

• Measure before pleading. Retain a consultant to record decibel levels, particulate deposition, odour intensity by recognized panel methods, or vibration in accepted units, with contemporaneous logs and comparison to background conditions.
• Establish substantiality objectively. Assemble evidence from multiple neighbours and from ordinary uses; a claim resting on one unusually sensitive occupant is vulnerable under § 821F.
• Give written notice early. Notice converts an unintentional invasion into an intentional one under § 825 and starts the record for punitive exposure.
• Plead both private and public nuisance where the facts permit. The private count avoids the special-injury requirement; the public count reaches interferences unconnected with the plaintiff's own parcel.
• Price the abatement. Evidence of a feasible and affordable control measure is the most effective single item in the plaintiff's case, and the most effective answer for a defendant who can show that no such measure exists.
• Check the statutory landscape first. Right-to-farm, shooting-range, airport, and industrial-immunity statutes may dispose of the claim before any common-law analysis begins.
• Do not rely on the defendant's permits, and do not fear them. Compliance is not a defence and violation is not a cause of action; both are evidence.
• Characterize the nuisance for limitations purposes at the outset. Where the temporary or permanent character is doubtful, file within the shorter period.
• Plan the remedy from the first pleading. Decide whether the objective is closure, controlled operation, or capitalized compensation, and develop the valuation evidence that the chosen remedy requires.
• Record any permanent-damages judgment. Permanent damages create what is in substance a servitude; the judgment should appear in the chain of title so successors take with notice.
• Prefer private ordering where the future is foreseeable. A recorded easement or covenant under Chapters 21 and 23 gives certainty that nuisance cannot.
• Avoid self-help. Abatement by entry is privileged only within narrow limits and ordinarily converts the client from plaintiff to defendant.

• Misconception: “If the activity complies with zoning and holds every permit, it cannot be a nuisance.” Correct rule: public regulation prescribes a minimum standard of conduct and confers no private licence to injure a neighbour; compliance is evidence bearing on reasonableness, not immunity.
• Misconception: “A zoning or environmental violation establishes a nuisance.” Correct rule: a violation is evidence of unreasonableness, and is expressly relevant to public nuisance under § 821B(2)(b), but the plaintiff must still prove a substantial interference with his own use and enjoyment.
• Misconception: “Nuisance requires a physical invasion of the plaintiff's land.” Correct rule: nuisance is by definition nontrespassory; odour, noise, vibration, and light are actionable without any tangible entry.
• Misconception: “Any interference with use and enjoyment is a nuisance.” Correct rule: the interference must be both substantial, judged by a normal person in the community, and unreasonable; either alone is insufficient.
• Misconception: “Intentional nuisance requires an intent to harm the neighbour.” Correct rule: under § 825 it is enough that the actor knows the invasion is resulting or is substantially certain to result; a notified defendant who continues is invading intentionally though entirely well-meaning.
• Misconception: “Coming to the nuisance defeats the claim.” Correct rule: priority of occupation is a factor bearing on reasonableness and on the equities of relief, not a bar; Sturges v. Bridgman and § 840D. Statutory right-to-farm immunity is a separate matter and must be checked independently.
• Misconception: “Long continuance of the activity gives a prescriptive right.” Correct rule: prescription runs only while the invasion is actionable, and the right acquired is measured by the invasion actually maintained; an intensification is a fresh nuisance.
• Misconception: “A prescriptive right may be acquired to maintain a public nuisance.” Correct rule: it may not; the public does not lose its rights through the passage of time or the inaction of its officers.
• Misconception: “Proving a nuisance entitles the plaintiff to an injunction.” Correct rule: injunctive relief is discretionary and subject to a balance of equities; Boomer and Madison v. Ducktown show that a plaintiff may establish the wrong and receive only damages.
• Misconception: “An award of damages leaves the plaintiff free to sue again next year.” Correct rule: permanent damages compensate all present and future harm from the continuing nuisance as conducted and bar further actions, ordinarily binding successors as well.
• Misconception: “The plaintiff always wins the remedy he asks for; the defendant never receives payment.” Correct rule: Spur Industries shows that a court may enjoin the defendant and simultaneously require the plaintiff to indemnify him where the plaintiff created the conflict.
• Misconception: “A landowner has a right to light, air, and view.” Correct rule: American law recognizes no such right absent an express easement or statute; Fontainebleau states the rule and Prah v. Maretti is a minority departure confined largely to solar access.
• Misconception: “Any private citizen may sue to abate a public nuisance for damages.” Correct rule: a private damages claim requires special injury different in kind from that suffered by the public; injunctive standing may be broader under § 821C(2) and under citizen-suit statutes.
• Misconception: “Public nuisance is simply a large private nuisance.” Correct rule: they are distinct wrongs. Public nuisance interferes with a right common to the general public, requires no interest in land, and originated in the criminal law.
• Misconception: “A lawful business cannot be a nuisance.” Correct rule: lawfulness merely removes the case from the narrow category of nuisance per se; a lawful business conducted lawfully is fully liable as a nuisance per accidens if its effects are substantial and unreasonable in its location.
• Misconception: “The defendant's greater economic value defeats liability.” Correct rule: disparity of value bears principally on the remedy. Bamford v. Turnley rejects utility as a defence to liability, and § 826(b) imposes liability where serious harm can feasibly be compensated.
• Misconception: “The injured party may simply abate the nuisance himself.” Correct rule: self-help abatement is privileged only where reasonably necessary, ordinarily after notice, without breach of the peace, and without excess damage; it is disfavoured and hazardous.
• Misconception: “A nuisance judgment transfers title or an easement of record automatically.” Correct rule: a judgment adjudicates rights between the parties; where permanent damages create a de facto servitude, its effect on purchasers depends on recording under the principles of Chapters 31 and 32, not on the judgment's mere existence.

Nuisance is the common law's default adjustment of conflicting uses of neighbouring land. A private nuisance is a nontrespassory invasion of the possessor's interest in the use and enjoyment of land that is both substantial, judged objectively against a normal occupant, and unreasonable, judged by the gravity-utility balance of § 826(a) or, in jurisdictions that have adopted it, by the serious-harm-and-feasible-compensation test of § 826(b). Intent bears its distinctive meaning: knowledge that the invasion results or is substantially certain to result, so that a defendant who continues after notice invades intentionally.

Public nuisance is a distinct wrong, historically criminal, consisting in an unreasonable interference with a right common to the general public; it requires no interest in land, and a private plaintiff seeking damages must show injury different in kind from that suffered by the public. Locality shapes both substantiality and unreasonableness; priority of occupation is a factor and not a bar; prescription may legitimate a private invasion but never a public one; and compliance with zoning or permitting confers no immunity.

The remedial law is the distinctive feature of the subject. Equity balances hardship before enjoining, frequently regulating the manner rather than prohibiting the activity, and may substitute permanent damages measured by diminution in market value — an award that operates in substance as a servitude and bars future actions — or, as in Spur Industries, enjoin the defendant on condition that the plaintiff indemnify him. Temporary and permanent characterizations control both the measure of damages and the running of limitations.

Chapter 29 remains within Part IX and takes up Zoning and the Police Power. It traces the movement from the case-by-case, retrospective adjudication of nuisance to the prospective, legislative allocation of uses by district — a movement whose constitutional foundation in Village of Euclid v. Ambler Realty Co. was built expressly upon the analogy of nuisance, and whose limits are set by the takings doctrine reserved to Chapter 30.

• Restatement (Second) of Torts §§ 821A–840E, 930, 933, 941 (Am. L. Inst. 1979).
• Boomer v. Atlantic Cement Co., 257 N.E.2d 870 (N.Y. 1970); Spur Industries, Inc. v. Del E. Webb Development Co., 494 P.2d 700 (Ariz. 1972).
• St. Helen's Smelting Co. v. Tipping, 11 Eng. Rep. 1483 (H.L. 1865); Bamford v. Turnley, 122 Eng. Rep. 27 (Ex. Ch. 1862); Sturges v. Bridgman, (1879) 11 Ch. D. 852.
• Guido Calabresi & A. Douglas Melamed, Property Rules, Liability Rules, and Inalienability, 85 Harv. L. Rev. 1089 (1972).
• Ronald H. Coase, The Problem of Social Cost, 3 J.L. & Econ. 1 (1960).
• 9 Richard R. Powell, Powell on Real Property ch. 64 (Michael Allan Wolf ed.); 6 Tiffany, The Law of Real Property §§ 693–712 (3d ed. 1939).
• Stoebuck & Whitman, The Law of Property §§ 7.2–7.5 (3d ed. 2000); Prosser and Keeton on the Law of Torts §§ 86–91 (5th ed. 1984).
• A. W. B. Simpson, Victorian Law and the Industrial Spirit (1995); Sir John Baker, An Introduction to English Legal History chs. 21–22 (5th ed. 2019).
• Real Law Society Press, Foundations of Property Law — Second Edition, Chapter 21 (Easements), Chapter 23 (Real Covenants and Equitable Servitudes), and Chapter 27 (Transfer of Leasehold Interests).