Pacifica, CA Noise Ordinances: Vehicle Noise (2026)
Key Facts
- Horn rule
- Only as danger warning permitted
- Exhaust rule
- Effective muffler required
- Defective vehicle rule
- No loud grating, grinding, rattling
- Enumeration status
- Illustrative, not exclusive (§ 5-10.02)
- Default penalty
- Misdemeanor up to $1,000 / 6 months
Summary
In the City of Pacifica, sounding a vehicle horn except as a danger warning, running an exhaust without an effective muffler, and driving a vehicle so out of repair or loaded that it grates, grinds or rattles loudly are each declared unlawful disturbing noises under Pacifica Municipal Code § 5-10.03(a), (g) and (h).
(a)Vehicle horns and signaling devices.(1)The sounding of any horn or signaling device on any automobile, motorcycle, streetcar, or other vehicle on any street or public place of the City except as a danger warning; ... (g)Exhausts. The discharge into the open air of the exhaust of any steam engine, stationary internal combustion engine, motorboat, or motor vehicle, except through a muffler or other device which will effectively prevent loud or explosive noises therefrom;(h)Defective or loaded vehicles. The use of any automobile, motorcycle, or vehicle so out of repair, so loaded, or in such manner as to create loud and unnecessary grating, grinding, rattling, or other noise;
Full Breakdown
03 of the city's noise ordinance enumerates specific vehicle-related noises as violations. Subsection (a) restricts horns and signaling devices, prohibiting sounding one except as a danger warning, creating an unreasonably loud or harsh sound with one, sounding one for an unreasonable period, using anything other than a hand- or electric-operated device, using a horn or whistle powered by engine exhaust, or sounding one when traffic is simply delayed. Subsection (g) requires that exhaust from any steam engine, stationary internal combustion engine, motorboat or motor vehicle pass through a muffler or other device that effectively prevents loud or explosive noise.
Subsection (h) separately targets defective or overloaded vehicles, making it a violation to operate an automobile, motorcycle or other vehicle that is so out of repair, or so loaded, that it creates loud and unnecessary grating, grinding, rattling or other noise. audible at 50 feet. 02's general prohibition, any other loud or unusual vehicle noise not specifically enumerated, such as a modified or straight-piped exhaust, can still be cited as a disturbing noise even where it does not fit neatly into subsection (g).
Violations & Fines
No separate fine schedule applies to Chapter 10, so a vehicle-noise citation under Section 5-10.03 is enforced under the Code's general penalty in Section 1-2.01: a misdemeanor carrying up to a $1,000 fine and six months in county jail, or, at the City Attorney's discretion, an infraction starting at $100 for a first offense, $200 for a second within a year, and $500 for a third or later offense.
Frequently Asked Questions
Can I honk my horn in Pacifica if I'm just annoyed at traffic?
Does Pacifica require a muffler on my car's exhaust?
Can a beat-up, rattling car get a noise citation in Pacifica?
Sources & Official References
Other rules in Pacifica
California rules heatmap·Compare Pacifica to another location·View the California noise ordinances overview
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Vehicle Noise in Nearby Cities
How other cities in San Mateo County handle vehicle noise.