Dublin, CA Noise Ordinances: Vehicle Noise (2026)

For everyday vehicle noise, such as loud idling, revving, or sound systems on private property, Dublin relies on its general noise ordinance, Section 5.28.020, which prohibits loud, unnecessary, or habitual noise that disturbs a reasonable person of normal sensitivity, weighing time, place, and proximity to homes. On public roads, the controlling rules are state law. California Vehicle Code Section 27150 requires that every motor vehicle with an internal combustion engine and subject to registration be equipped at all times with an adequate muffler in constant operation and properly maintained to prevent excessive or unusual noise, and it bars cutouts, bypasses, or similar devices. Section 27151 prohibits modifying a vehicle's exhaust system in a manner that amplifies or increases noise beyond the limits in the Vehicle Code; for most passenger vehicles and light trucks, the applicable test reflects a 95 dBA standard. Because these are state statutes, they are enforced by Dublin Police Services (and the CHP) rather than under the Municipal Code, and a citation can require the vehicle to pass a referee inspection. Excessively loud aftermarket exhaust, engine revving, or amplified car audio that disturbs a neighborhood may therefore be addressed under either the local nuisance standard (on private property) or the Vehicle Code (on the road). Confirm current enforcement procedures with Dublin Police Services.