Vehicle Noise: Antioch vs Martinez
How do vehicle noise rules compare between Antioch, CA and Martinez, CA?
Antioch and Martinez have similar restriction levels.
Antioch, CA
Contra Costa County
Antioch prohibits modified exhaust systems, excessive engine revving, squealing tires, and loud car stereos audible more than 50 feet from the vehicle. California Vehicle Code sections 27150-27151 also apply, with a statewide 95-decibel maximum for vehicle exhaust.
View full Antioch rules →Martinez, CA
Contra Costa County
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.
View full Martinez rules →Key Facts Comparison
| Fact | Antioch | Martinez |
|---|---|---|
| State Decibel Limit | 95 dB at 50 ft (CVC §27151) | - |
| Stereo Audibility | Prohibited beyond 50 ft | - |
| Typical Fine | $193+ for exhaust violations | - |
| Sideshow Penalty | Enhanced fines + impound | - |
| Enforcement | Antioch PD | - |
| - | - |
Highlighted rows indicate differences between cities.
Antioch FAQ
Are aftermarket exhausts legal in Antioch?
Only if they remain under 95 decibels measured per SAE J1492 and meet CARB requirements. 'Straight pipes' and modifications that remove catalytic converters are illegal under state law.
Can I be ticketed for a loud car stereo?
Yes. California Vehicle Code §27007 prohibits sound amplification audible more than 50 feet from the vehicle on public roads. Antioch enforces this actively.
Martinez FAQ
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