Daly City Municipal Code § 9.22.010 and § 9.22.030 regulate industrial noise under a qualitative public-nuisance standard rather than fixed decibel limits. Between 10:00 p.m. and 6:00 a.m., no industrial operation may emit noise audible beyond the property line. During daytime hours, industrial noise that disturbs the public peace is prohibited under § 9.22.010 regardless of decibel level.
Unlike many California cities, Daly City does not adopt a numeric dB(A) industrial noise table. Chapter 9.22 (Disturbing the Peace) is the city's primary noise authority and is enforced by the Daly City Police Department. Section 9.22.010 broadly prohibits any noise, disorder, or tumult that disturbs the public peace on any premises within the city. Section 9.22.030 imposes a strict nighttime quiet rule: between 10:00 p.m. and 6:00 a.m. no person may cause noise that may be heard beyond the property line. Industrial operations in M-1 and M-2 zones (per Title 14 Zoning) must comply with both Chapter 9.22 and California Code of Regulations Title 24 (building/mechanical noise insulation standards for shared-wall worker-occupied spaces). The General Plan Noise Element identifies industrial noise as a localized source primarily affecting commercial corridors along Mission Street, Geneva Avenue, and the Bayshore/SR-101 frontage. Cal/OSHA (8 CCR § 5095-5100) governs in-facility worker noise exposure (90 dBA 8-hr permissible exposure limit).
Misdemeanor under § 9.22.010 (per Daly City Code Title 1 general penalty). Code enforcement typically issues administrative citations first; repeat offenders may receive cease-and-desist orders or have their business license reviewed under Title 5.
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