San Ramon, CA Noise Ordinances: Vehicle Noise (2026)
Key Facts
- Governing section
- Municipal Code § B6-91
- Nighttime test
- Plainly audible 50 feet, 10 p.m.-8 a.m.
- Covers
- Stereos, radios, audio devices in vehicles
- First-offense fine
- Up to $100
- Vehicle exhaust/muffler
- Governed by state Vehicle Code, not this section
Summary
San Ramon Municipal Code section B6-91 bans playing a car stereo or other sound equipment loud enough to disturb neighbors, and treats a vehicle stereo plainly audible 50 feet away between 10 p.m. and 8 a.m. as automatic proof of a violation. The rule reaches audio played in a vehicle as well as a home.
A. It is unlawful for a person to use, operate or permit to be played, used or operated a radio, receiving set, stereo, television set, jukebox, musical instrument, phonograph or other machine or device for the producing or reproduction of sound in such manner as to disturb the peace, quiet or comfort of the neighboring inhabitants or to do so with a louder volume than is necessary for convenient hearing for persons in the room, vehicle or chamber in which the device is operated. B. The operation of any such device specified in subsection A of this section between the hours of ten p.m. and eight a.m. in such a manner as to be plainly audible at a distance of fifty feet from the building, structure or vehicle in which it is located is prima facie evidence of a violation of this section.
Full Breakdown
Section B6-91(A) makes it "unlawful for a person to use, operate or permit to be played, used or operated a radio, receiving set, stereo, television set, jukebox, musical instrument, phonograph or other machine or device for the producing or reproduction of sound" louder than necessary for convenient hearing "for persons in the room, vehicle or chamber in which the device is operated," or in a manner that disturbs the peace, quiet or comfort of neighboring inhabitants. so it is "plainly audible at a distance of fifty feet from the building, structure or vehicle in which it is located" is treated as prima facie evidence of a violation, meaning the city does not need a decibel meter reading to cite a blasting car stereo overnight.
San Ramon's code has no separate muffler or exhaust-noise section for vehicles; loud mufflers and modified exhaust on a vehicle traveling on a public street fall under the California Vehicle Code's statewide equipment standards rather than a distinct city ordinance. Daytime stereo noise from a parked or idling vehicle is still reachable under the general B6-83 nuisance factors: volume, duration, whether it's recurring, and proximity to residential sleeping areas.
Violations & Fines
A vehicle stereo violation is an infraction under section B6-121, punished per section A1-32: up to $100 for a first offense, $200 for a second within a year, and $550 for each later violation in that same year. Section B6-122 lets the city treat a repeatedly loud vehicle sound system as a public nuisance subject to abatement by restraining order or injunction.
Frequently Asked Questions
Can San Ramon cite me for a loud car stereo?
Does San Ramon have its own loud muffler law for cars?
What's the fine for a vehicle noise violation in San Ramon?
Sources & Official References
Other rules in San Ramon
California rules heatmap·Compare San Ramon to another location·View the California noise ordinances overview
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Vehicle Noise in Nearby Cities
How other cities in Contra Costa County handle vehicle noise.