Noise Ordinances in Hercules, CA (2026)
2 verified noise ordinances for Hercules, California, sourced directly from the municipal code and official government pages.
Verified from official government sources
Decibel Limits
New residential projects in Hercules must be designed to keep outdoor noise at or below Ldn 60 dBA and indoor noise in new units at or below Ldn 45 dBA. The City Council can allow up to 65 dBA at small decks when mitigation can't reach 60, and bedrooms face an added 50 dBA instantaneous cap.
Hercules Sets 60 dBA Outdoor Noise Standard
Some RestrictionsHercules Municipal Code § 13-31.300(11)(A)
The maximum acceptable noise levels in residential areas is a Ldn of 60 dBA. This level shall guide the design and location of future development, and is a goal for the reduction of noise in existing development. ... Where the City determines that providing a Ldn of 60 dBA or lower cannot be achieved after the application of feasible mitigations, a Ldn of 65 dBA may be permitted at the small de...
Vehicle Noise
Hercules Municipal Code Section 4-5.05 requires motorcycles, motor-driven cycles, motorized bicycles and off-highway vehicles operating off improved streets to run an adequate, properly maintained muffler meeting state Vehicle Code Section 38280, with cutouts and bypass devices banned outright.
Hercules Off-Road Vehicle Muffler Rule
Some RestrictionsHercules Municipal Code Sec. 4-5.05
Sec. 4-5.05. Mufflers. It shall be unlawful for any person to drive, ride or use a motorcycle, motor-driven cycle, motorized bicycle or off-highway motor vehicle as such vehicles are defined in Sections 400, 405, 406 and 38012, respectively, of the Vehicle Code of the State of California upon any public or private property which is not an improved public street or highway or an improved private...
Looking for Contra Costa County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Hercules city rules.
Noise Ordinances in Contra Costa County →