Industrial noise in Chino is governed primarily by Chino Municipal Code Chapter 9.40 (NOISE), §9.40.040 Exterior Noise Standards, with measurement methodology fixed in §9.40.020 (A-weighted, slow response, reference 20 micropascals). Per the city's General Plan Noise Element and CMC, the baseline exterior noise standard applied at the receiving property line is 65 dBA. Industrial sources (M-1 Light Industrial and M-2 General Industrial zones, including The Preserve specific-plan industrial areas, Chino Industrial Park along Edison Ave / Pine Ave, and the Auto Center) must not cause noise at adjoining residential property lines exceeding the residential standard (65 dBA daytime 7 a.m.–10 p.m. / 55 dBA nighttime 10 p.m.–7 a.m.). Mechanical and electrical equipment at industrial sites (cooling towers, compressors, dust collectors) is independently regulated under CMC §§9.40.030–9.40.060. Title 20 Zoning performance standards layer in vibration, glare, and noise limits enforced at the time of site-plan review.
Chino's industrial base — legacy dairies converting under The Preserve specific plan, auto-related businesses, distribution warehousing along the SR-71 / SR-60 corridor, and aerospace/defense suppliers near KCNO — means industrial-residential interfaces are common, especially where R-zoned parcels abut M-zoned land in the agricultural/equestrian transition. Chino enforces noise via the Code Enforcement Division (909-334-3263) and Planning Division. Industrial users typically receive a notice-to-comply before administrative citation; chronic offenders face conditional-use permit (CUP) review and revocation under Title 20. The CMC permits a 5 dBA upward adjustment for ambient noise levels that already exceed the standard; conversely, pure-tone or impulsive sources receive a 5 dBA penalty in measurement. California Labor Code §6307 and Cal/OSHA noise standards (8 CCR §5095 et seq., 90 dBA 8-hr TWA action level) apply separately to worker exposure inside industrial facilities.
Administrative citation under CMC §9.40 for exceedance of exterior noise standard at receiving property line: typical fines $100 first offense, $200 second, $500 third within 12 months (Chino's standard administrative citation schedule). Industrial CUP holders also face conditions-of-approval enforcement, with permit revocation as the ultimate remedy. Civil nuisance actions under Civil Code §3479 remain available to neighboring property owners.
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