Carson Municipal Code Art. 4 Ch. 5 adopts LA County Code Title 12 Ch. 12.08 by reference. Section 12.08.390 sets exterior decibel standards by Noise Zone (defined in §12.08.380). Residential (Zone I): 50 dBA daytime 7 a.m.–10 p.m. / 45 dBA nighttime 10 p.m.–7 a.m. Commercial (Zone II): 65 dBA day / 60 dBA night. Industrial (Zone III): 70 dBA at all hours. The standards are measured at the property line of the receiving property. Graduated exceedance allowances (§12.08.390): base standard for 30+ min/hour; +5 dBA for 15–30 min/hr; +10 dBA for 5–15 min/hr; +15 dBA for 1–5 min/hr; +20 dBA for less than 1 min/hr; never above ambient + 20 dBA in any case. If the ambient L50 already exceeds the table value, ambient L50 becomes the baseline. Plainly-audible-from-100-feet (residential) and similar nuisance standards under §12.08.560 also apply for amplified sound, animals, and parties.
Adoption mechanism: Carson is a contract city that incorporated in 1968; CMC Art. 4 Ch. 5 §6500 expressly adopts 'Chapter 12.08 of Title 12 of the Los Angeles County Code as amended and in effect' as the city's noise ordinance, with the Los Angeles County Health Officer designated as enforcement authority alongside the Sheriff's Carson Station and Carson Code Enforcement. Measurement: §12.08.220 / §12.08.230 require an ANSI Type 1 or Type 2 sound level meter, A-weighted, slow response, microphone at least 4 feet above ground, at the property line of the affected receiver (or, inside a multi-family unit, 4 feet from the noisiest wall). Indoor standards (§12.08.400) apply when noise enters an inhabited dwelling: 45 dBA day / 40 dBA night for multi-family from another unit. Interior limits cap +5 dBA daytime exceedance, +0 nighttime. Special prohibitions (§12.08.400 & .560): amplified sound audible to a person of normal hearing at 50 feet from the source in a residential zone is per se a violation; loudspeakers facing residential zones from commercial property are limited; vehicle sound systems plainly audible at 50 ft violate Cal. Vehicle Code §27007. Construction noise (§12.08.440) limited to 7 a.m.–7 p.m. weekdays; no Sunday/holiday construction except by Health Officer variance. Variances (§12.08.580): Health Officer may grant short-term variances for events, demolition, emergency. Exclusions (§12.08.020): aircraft in flight, emergency vehicles, school activities during school hours, official parades, certain agricultural operations.
Misdemeanor under LA County Code §12.08.030 (adopted by Carson): up to $1,000 fine and/or 6 months in jail. Practical enforcement: first complaint typically warning; second within 12 months — infraction citation; persistent — misdemeanor referral. Carson Code Enforcement issues administrative citations under CMC Art. 1 Ch. 6 starting at $100 / $200 / $500. Civil injunctive relief and nuisance abatement under Cal. Civ. Code §3479–3480 also available.
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