Martinez, CA Noise Ordinances: Vehicle Noise (2026)
Key Facts
- Note
- CVC §27150-27151 regulate exhaust noise (95 dB standard)
- Note
- Car stereo audible at 50+ feet is a violation
- Fine Range
- Up to $2,000 per individual offense
- Note
- Correctable violations can be reduced with referee certification
- Note
- Enforced by Martinez PD and CHP on major corridors
Summary
Vehicle noise in Martinez is regulated through California Vehicle Code sections enforced by Martinez Police, including prohibitions on modified exhaust systems, excessive engine revving, loud stereos audible from 50+ feet, and sustained horn use. Fines typically range from $200 to $500, with equipment violations requiring proof of correction through a certified referee inspection.
27150.
(a) Every motor vehicle equipped with an internal combustion engine and subject to registration shall at all times be equipped with an adequate muffler in constant operation and properly maintained to prevent any excessive or unusual noise, and no muffler or exhaust system shall be equipped with a cutout, bypass, or similar device.
(b) Except as provided in Division 16.5 (commencing with Section 38000) with respect to off-highway motor vehicles subject to identification, every passenger vehicle operated off the highways shall at all times be equipped with an adequate muffler in constant operation and properly maintained so as to meet the requirements of Article 2.5 (commencing with Section 27200), and no muffler or exhaust system shall be equipped with a cutout, bypass, or similar device.
27151.
(a) A person shall not modify the exhaust system of a motor vehicle in a manner which will amplify or increase the noise emitted by the motor of the vehicle so that the vehicle is not in compliance with the provisions of Section 27150 or exceeds the noise limits established for the type of vehicle in Article 2.5 (commencing with Section 27200). A person shall not operate a motor vehicle with an exhaust system so modified.
(b) For the purposes of exhaust systems installed on motor vehicles with a manufacturer's gross vehicle weight rating of less than 6,000 pounds, other than motorcycles, a sound level of 95 dbA or less, when tested in accordance with the most current SAE International standard, complies with this section. Motor vehicle exhaust systems or parts thereof include, but are not limited to, nonoriginal exhaust equipment.
Full Breakdown
Martinez Police enforce vehicle noise primarily under California Vehicle Code §27150 (adequate muffler required) and §27151 (modification of exhaust to amplify or increase noise prohibited). Aftermarket exhaust systems must meet SAE J1492 or J1169 standards, typically 95 decibels at 50 feet for passenger vehicles. Loud car stereos audible from 50 feet or more violate CVC §27007 and trigger citations. Motorcycle noise is a recurring complaint along Alhambra Avenue, Pacheco Boulevard, and Highway 4 corridors, where CHP and Martinez PD conduct periodic enforcement. Excessive engine revving, tire squealing, and exhibition of speed are prohibited under CVC §23109 and Martinez Municipal Code.
Semi-truck engine braking (jake brakes) is discouraged on city streets but not explicitly banned; signs are posted on key truck routes. Fines typically range from $200 for first offenses to $500+ for repeat violations. Equipment violations (loud exhaust) are correctable: drivers can reduce the fine by obtaining a referee station certification within 30 days. Commercial vehicle noise near the Martinez Marina, Amtrak station, and Shell Refinery access routes is regulated through operational permits.
Frequently Asked Questions
Are loud motorcycles legal in Martinez?
Can I report a loud car stereo?
Sources & Official References
Other rules in Martinez
California rules heatmap·Compare Martinez 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.