Mountain View's Noise Ordinances: The Rules That Matter

Every city handles noise ordinances a little differently. In Mountain View, California, there are 7 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.

Leaf Blower Rules

Mountain View was an early California city to ban gas-powered leaf blowers, aligning with AB 1346; only electric and battery units are permitted, with time restrictions on all blowers.

Key details: Gas blowers: Banned. Electric blowers: Permitted with limits. Weekday hours: 8am to 8pm. Weekend hours: 9am to 6pm. State law: AB 1346 alignment.

Construction Hours

Construction in Mountain View can only run 7 a.m. to 6 p.m., Monday through Friday, under City Code Sec. 8.06.05; no work is allowed on Saturdays, Sundays or recognized holidays without the chief building official's written approval. The rule covers any physical site activity, including material deliveries, and violating it is a code violation in its own right.

Key details: Weekday hours: 7:00 a.m. to 6:00 p.m., Monday-Friday. Weekend/holiday work: Barred without prior written approval. Covers: Any site activity, including material deliveries. Modification notice: 24 hours' written notice required. Emergency work: Allowed any hour, reported next business day.

Sec. 8.06.05(e) makes violating the allowed construction hours, or failing to post the required jobsite sign, a violation of the Mountain View Building Code in its own right, separate from any other code enforcement action. The chief building official can also revoke a previously approved hours modification, and neighbors or city staff can demand to see the written approval for any work happening outside the standard 7 a.m. to 6 p.m. weekday window.

Vehicle Noise

Mountain View bans operating any vehicle equipped with a sound-amplifying device on a public street if the sound carries onto private property or reaches other people using the street, under City Code Sec. 19.20. The rule covers loudspeakers and amplified car stereos alike, with no minimum decibel threshold to trigger it.

Key details: Governing section: City Code Sec. 19.20. Trigger: Sound reaches others or private property. Decibel limit: None specified in the code. First-offense fine: Up to $100 (Sec. 1.7). Repeat offense: Up to $500, then misdemeanor on 4th.

A Sec. 19.20 violation is charged as a citywide code violation under Sec. 1.7: a first offense is an infraction punishable by a fine up to $100, a second offense within a year up to $200, and a third or later offense within that year up to $500; a fourth violation in the same year can instead be prosecuted as a misdemeanor.

This is not one of those rules that cities tend to ignore. Mountain View actively enforces its vehicle noise requirements.

Barking Dogs

Mountain View makes it unlawful to keep a dog that disturbs neighbors with loud barking under City Code Sec. 5.62. "Loud barking" has a numeric definition: continuous barking for ten minutes, or intermittent barking for thirty minutes, that crosses a residential or commercial property line. A dog defending against a trespasser is exempt.

Key details: Continuous barking threshold: 10 minutes triggers a violation. Intermittent barking threshold: 30 minutes or more triggers a violation. Trespasser exception: Defensive barking is not "loud barking". Burden of proof: On the owner to prove the exception. Enforcement: Animal control officers cite under Penal Code Sec. 836.5.

A single loud-barking episode that meets the ten-minute continuous or thirty-minute intermittent threshold is a citable Chapter 5 violation. Animal control officers and peace officers, acting under Penal Code Sec. 836.5 as applied by Sec. 5.85, may issue a citation to the dog's owner or keeper. Repeated substantiated complaints can also support a public nuisance case under Sec. 5.11 or trigger the impoundment procedures in Article II of Chapter 5.

Decibel Limits

Mountain View caps stationary noise sources at 55 dB(A) daytime and 50 dB(A) between 10 p.m. and 7 a.m. as measured on any receiving residential property, City Code Sec. 21.26. Equipment exceeding the limit can keep running only with a conditional use permit from the zoning administrator, and building permit applications for such equipment must document expected noise levels.

Key details: Daytime limit: 55 dB(A) on receiving residential property. Nighttime limit: 50 dB(A), 10 p.m. to 7 a.m.. Measurement standard: ANSI S1.4-1971 Type 2 sound meter. Over-limit path: Conditional use permit from zoning administrator. Permit process: Runs through City Code Sec. 36.43.

Running stationary equipment above 55 dB(A) daytime or 50 dB(A) at night on a residential receiving property without a zoning administrator's conditional use permit violates Sec. 21.26. Because the section states that an initial equipment permit does not excuse later noncompliance, a property owner can be found in violation years after installation if measured levels exceed the standard, and equipment can be ordered brought into compliance or shut down through code enforcement.

Aircraft Noise

Any project in Mountain View that would put a new building where aircraft noise from Moffett Federal Airfield reaches CNEL 65 dB or louder must grant the U.S. Government and Santa Clara County an avigation easement before the city issues a building permit, under City Code Sec. 36.06.28, adopted January 27, 2026.

Key details: Noise threshold: CNEL 65 dB or greater. Easement grantees: U.S. Government and Santa Clara County. Timing: Required before any building permit. Adopted: Ordinance No. 2.2026, January 27, 2026. Source map: Moffett Federal Airfield CLUP.

Sec. 36.06.28 is a building permit precondition, not a standalone infraction: the city has no basis to issue a building permit for a qualifying project until the easement is granted and recorded. Proceeding with construction on a site the CLUP maps at CNEL 65 dB or higher without recording the required easement exposes the project to the same enforcement remedies as any other unpermitted construction under the zoning and building codes.

Amplified Music & Outdoor Sound

Mountain View restricts outdoor sound devices, such as loudspeakers or sound amplifiers used to advertise or draw attention to a building, to a 150-foot audibility limit and bars them within 100 yards of any hospital or library. Outside a narrow Christmas-season exception, anyone operating one on public streets must first obtain a sound amplification permit from the community services department under City Code Sec. 3.17.

Key details: Audibility limit: Not audible beyond 150 feet. Hospital/library buffer: 100 yards minimum. Christmas exception hours: 9 a.m.-10 p.m., Mon-Sat only. Permit lead time: 10 business days (90 for street closure). Enforcing agency: Community Services Department.

Operating a sound device without the required permit, exceeding the 150-foot audibility limit, running past 10:00 p.m., or broadcasting on a Sunday during the Christmas exception is enforced under the citywide penalty schedule in Sec. 1.7: up to a $100 fine for a first infraction, $200 for a second within a year, $500 for a third, and a fourth violation in the same year may be charged as a misdemeanor with fines and up to six months in jail.

The Bottom Line

Mountain View's noise ordinances rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Mountain View is broadly strict or permissive.

This guide is based on Mountain View's current municipal code. Local rules can and do change, so check the individual ordinance pages for the latest details, penalties, and FAQs.