Castro Valley, CA Noise Ordinances: Vehicle Noise (2026)
Key Facts
- Repair Hours
- 7 a.m.-7 p.m. residential only
- Exhaust dB Limit
- 95 dB(A) per VC §27151
- Engine Brake
- Restricted in posted areas
Summary
Alameda County Code §6.60.050 prohibits repairing, rebuilding, modifying or testing vehicles in residential areas between 7 p.m. and 7 a.m. if it produces sound plainly audible at 50 feet. State Vehicle Code adds modified-exhaust and engine-brake limits.
Repairing, rebuilding, modifying or testing of vehicles in residential areas between 7 p.m. and 7 a.m. if it produces sound plainly audible at 50 feet from the vehicle.
Full Breakdown
Section 6.60.050 explicitly bans residential-area vehicle work between 7 p.m. and 7 a.m. when sound is plainly audible at 50 feet from the vehicle. California Vehicle Code §27150 prohibits any vehicle without an adequate muffler; §27151 bans modified exhaust louder than 95 dB(A). Engine brakes ('Jake brakes') on Castro Valley Boulevard / I-580 are restricted in posted areas. Loud motorcycles routinely cited under Cal. VC §27151.
Violations & Fines
Vehicle work outside allowed hours: §6.60 violation, $100-$500 admin citation or misdemeanor. Modified exhaust: VC §27150 fix-it ticket, $25 plus correction; refusal to correct escalates to $200+.
Frequently Asked Questions
Can I work on my car in the driveway after dinner?
Sources & Official References
Other rules in Castro Valley
California rules heatmap·Compare Castro Valley to another location·View the California noise ordinances overview
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Vehicle Noise in Nearby Cities
How other cities in Alameda County handle vehicle noise.