CIV § 3479

Nuisance defined: harm to health or property | CIV § 3479

Under California CIV § 3479, a nuisance is anything injurious to health, offensive to senses, or obstructing property use, public parks, streets, or waters.

Official text CIV § 3479 — California

Anything which is injurious to health, including, but not limited to, the illegal sale of controlled substances, or is indecent or offensive to the senses, or an obstruction to the free use of property, so as to interfere with the comfortable enjoyment of life or property, or unlawfully obstructs the free passage or use, in the customary manner, of any navigable lake, or river, bay, stream, canal, or basin, or any public park, square, street, or highway, is a nuisance.

Text as published in the 2026 snapshot of the code.

Source: Vaquill Open US Law, compiled from official state publishers (huggingface.co), reproduced under license CC BY 4.0.

Read this provision at the official source →

What it actually says

Section 3479 is the definition every neighbour dispute in California runs through, and it is broader than most readers expect. Four things are a nuisance: anything injurious to health, including but not limited to the illegal sale of controlled substances; anything indecent or offensive to the senses; anything that is an obstruction to the free use of property, so as to interfere with the comfortable enjoyment of life or property; and anything that unlawfully obstructs the free passage or customary use of a navigable waterway or a public park, square, street or highway.

The qualifier that matters is attached to the third limb: "so as to interfere with the comfortable enjoyment of life or property". That phrase is what stops the definition swallowing every irritation. The section does not ask whether the neighbour's conduct is unusual or unneighbourly; it asks whether it interferes with comfortable enjoyment. Courts read that objectively — the test is not the sensitivity of the particular complainant — and take account of the character of the locality, so the same generator is a different case on a farm and in a terrace of flats.

What the section does not do is distinguish who may sue. That division comes immediately afterwards: § 3480 defines a public nuisance as one affecting an entire community or neighbourhood or a considerable number of persons at once, and § 3481 makes every nuisance not within that definition private. A private nuisance is actionable by the person whose use and enjoyment of land is affected; a public nuisance is generally the business of public authorities unless a private claimant has suffered special injury. Section 3479 also sets no threshold in decibels, hours or units of anything: whether a particular noise, smell or obstruction crosses the line is a question of fact about frequency, duration, time of day and the locality, and is worth putting to a lawyer before anything is filed.

When it applies

  • A neighbour's dog barking through the night, week after week
  • Fryer or extraction smells from a restaurant reaching flats above
  • A generator, pool pump or air conditioning unit running against a shared wall
  • Rubbish piled against a boundary, attracting rats and flies
  • Amplified music at 3am every weekend
  • A neighbour's structure or vehicle blocking access you have always used

What this section does not say

  • It sets no numeric limit. There are no decibels, no quiet hours and no distances in this section; those come from local ordinances, which are enforced separately and can give a different answer.
  • It does not say who may sue. That is the public/private division in §§ 3480 and 3481, and a nuisance affecting a whole neighbourhood is generally a matter for public authorities unless the claimant suffered special injury.
  • It is not about being annoyed. The third limb requires interference with the comfortable enjoyment of life or property, tested objectively, and an unusually sensitive complainant does not lower that bar.
  • It does not cover a view or an outlook. A neighbour's ugly extension, a blocked vista or lost privacy are not within "injurious to health", "offensive to the senses" or obstruction of the free use of your property in the sense this section uses.
  • It does not reach what the law expressly authorises. Section 3482 removes from the definition anything done or maintained under the express authority of a statute.

Worked examples

Invented situations, written to show how the wording bites. They are not real cases, not judgments and not precedent, and nothing here predicts what would happen in yours.

Illustrative example

A neighbour runs a generator for much of the day against a shared wall, and it is clearly audible in the bedroom on the other side. Two conversations have changed nothing.

How the wording applies

Section 3479 covers anything offensive to the senses or interfering with the comfortable enjoyment of life or property, tested objectively rather than by the complainant's sensitivity. What the outcome turns on is duration and timing rather than volume alone, since an hour on a weekday afternoon and a run from early morning to late evening are different facts under the same words. The section sets no decibel limits, which come from local ordinances instead.

How the parties settled it

The generator is moved away from the shared wall and housed in an acoustic enclosure, and its use is confined to agreed hours on weekdays.

Illustrative example

A restaurant's extraction outlet discharges close to the windows of the flats above, and frying smells fill the rooms every evening.

How the wording applies

Smell is squarely within the words offensive to the senses, and the fact this hinges on is the position and height of the flue rather than the cooking itself. A permit or a licence for the restaurant does not answer the claim, because section 3482 requires the express authority of a statute, which an operating permit is not.

How the parties settled it

The restaurant extends and redirects the flue to an agreed specification within a fixed period and services the filters monthly, and the residents agree to raise any further complaint in writing first.

Illustrative example

A dog is left alone in a yard and barks for hours most days. The owner says the dog is entitled to be in its own garden.

How the wording applies

The claim is about interference with the comfortable enjoyment of the neighbouring property, which does not depend on the dog being anywhere it should not be. It turns on the pattern, meaning how long, how often and at what hours, recorded as it happens, because a dated log is the difference between a nuisance claim and an assertion of annoyance.

How the parties settled it

The owner arranges a midday walk and daytime company for the dog and brings it indoors before an agreed hour, and the neighbours keep a shared log for a trial period.

How courts have read it

Decisions construing this provision. The question and the summary are ours; the quoted sentence is the court's own words, taken from the published opinion. These are the decisions in our corpus, not every decision there is, and nothing here predicts any other case. Reported 1991 to 2017.

Adams v. MHC Colony Park Ltd. Partnership, 224 Cal. App. 4th 601 (2014)

Court of Appeal

What the court had to decide

Did the trial court err by instructing the jury on the common law definition of public nuisance under Civil Code section 3479 as additional elements for a statutory public nuisance claim under Civil Code section 798.87?

What it held

The trial court erred by adding elements of a common law public nuisance (as defined in Civil Code section 3479) to the statutory public nuisance created by Civil Code section 798.87, but the error was not prejudicial.

In the court's words
Therefore, we agree with plaintiffs that the instructions and the special verdict form for public nuisance contained legal error in that they added elements of a common law public nuisance to the two types of public nuisance created by subdivisions (a) and (b) of Civil Code section 798.87.

People ex rel. Trutanich v. Joseph, 204 Cal. App. 4th 1512 (2012)

Court of Appeal

What the court had to decide

Does the illegal sale of controlled substances at a storefront business establish a public nuisance under Civil Code section 3479?

What it held

The illegal sale of controlled substances at Orgánica's premises constituted a nuisance per se under Civil Code section 3479, as the statute expressly includes such activity.

In the court's words
Such violations constitute nuisances per se under Civil Code section 3479.

Frieman v. San Rafael Rock Quarry, Inc., 116 Cal. App. 4th 29 (2004)

Court of Appeal

What the court had to decide

Whether the trial court erred in denying class certification for a nuisance cause of action under Civil Code section 3479.

What it held

The trial court did not err; its denial of class certification was proper because common questions did not predominate and individual issues of special injury required individualized proof.

In the court's words
We determine that the trial court used appropriate factual criteria and legal assumptions in ruling on the certification motion and affirm for the following reasons.

People ex rel. Gallo v. Acuna, 14 Cal. 4th 1090 (1997)

Supreme Court of California

What the court had to decide

Whether the gang activities described in the complaint fall within the statutory definition of a public nuisance under Civil Code section 3479.

What it held

The court held that the gang activities constitute a public nuisance within the statutory definition, but emphasized that the courts lack power to extend the definition beyond what the Legislature has enacted.

In the court's words
the ultimate legal authority to declare a given act or condition a public nuisance rests with the Legislature; the courts lack power to extend the definition of the wrong or to grant equitable relief against conduct not reasonably within the ambit of the statutory definition of a public nuisance

Beck Development Co. v. Southern Pacific Transportation Co., 44 Cal. App. 4th 1160 (1996)

Court of Appeal

What the court had to decide

Whether the subsurface contamination of Beck's property constituted a nuisance under Civil Code section 3479.

What it held

The court reversed the judgment against Southern Pacific, effectively holding that the nuisance claim was not viable, likely because the nuisance was permanent and the statute of limitations had expired.

In the court's words
Finally, we shall reverse the judgment in favor of Beck and against Southern Pacific and remand with directions to enter judgment in favor of Southern Pacific.

City of San Diego v. United States Gypsum Co., 30 Cal. App. 4th 575 (1994)

Court of Appeal

What the court had to decide

Whether the broad statutory definition of nuisance in Civil Code section 3479 allows recovery for a defective product under a nuisance cause of action.

What it held

The court held that nuisance is not an appropriate theory for recovery for a defective product like asbestos; the city's claim was essentially a products liability action, not a nuisance action.

In the court's words
City cites no California decision, however, that allows recovery for a defective product under a nuisance cause of action.

Source: Caselaw Access Project, CC0 1.0 Universal (public domain dedication).

The same problem elsewhere

The other legal systems in this collection answer the same everyday problem with their own provisions.

The comparison and these one-line summaries are in English.

Noise from the neighbours: what the law says in seven countries

Read the full comparison →

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We copy this text from the official publisher and re-check it against that source on every page load, but we cannot guarantee it is complete, current or free of error, and we accept no liability for any reliance on it. An amendment can take effect before a consolidation catches up. The publisher's own copy is linked below; where the two differ, it is the official one that counts.

This page reproduces the text of CIV § 3479 in force at the date shown and explains it in general terms. It is not legal advice and takes no account of the circumstances of your case, which can change the answer completely. For a live dispute, for limitation periods, and before taking any step in court, consult a qualified lawyer in California.

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