Industrial Noise: Chino vs Ontario
How do industrial noise rules compare between Chino, CA and Ontario, CA?
Chino and Ontario have similar restriction levels.
Chino, CA
San Bernardino County
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.
View full Chino rules →Ontario, CA
San Bernardino County
Ontario controls industrial and warehouse noise through zoning-based exterior sound limits and the nuisance ordinance. Noise crossing into residential zones faces daytime limits and stricter nighttime limits.
View full Ontario rules →Key Facts Comparison
| Fact | Chino | Ontario |
|---|---|---|
| Primary code | Chino Municipal Code Chapter 9.40 NOISE — §§9.40.020 (measurement), 9.40.040 (exterior standards) | - |
| Baseline exterior standard | 65 dBA (residential receiving zone) | - |
| Day/night thresholds | Daytime 7 a.m.–10 p.m.; Nighttime 10 p.m.–7 a.m. | - |
| Equipment-specific limits | Mechanical/electrical equipment: CMC §§9.40.030–9.40.060 | - |
| Worker exposure | Cal/OSHA 8 CCR §5095 (separate from CMC) | - |
| Enforcement contact | Code Enforcement Division — (909) 334-3263 | - |
| Code | - | OMC 5-29.07 and Development Code |
| Night Limits | - | Stricter 10 PM to 7 AM |
| Measurement | - | At residential property line |
| Truck Idling | - | 5-minute state limit |
| Regulator | - | City plus SCAQMD coordination |
Highlighted rows indicate differences between cities.
Chino FAQ
My house backs up to an industrial yard with a loud cooling tower running at 2 a.m. — what's the limit?
At a residential property line during nighttime hours (10 p.m.–7 a.m.), the CMC §9.40.040 standard is 55 dBA. File a complaint with Chino Code Enforcement (909-334-3263); they will measure with an ANSI Type 2 sound level meter per CMC §9.40.020 methodology. If exceedance is documented, the industrial operator receives a notice to comply followed by administrative citation.
Does Cal/OSHA take over industrial noise enforcement?
No — Cal/OSHA (8 CCR §5095) regulates worker exposure inside the facility (90 dBA 8-hour TWA action level, hearing-protection program at 85 dBA). External community noise impacts on neighbors remain a local-ordinance matter governed by CMC §9.40.
Ontario FAQ
Who enforces warehouse noise in Ontario?
Ontario Code Enforcement and Planning staff handle land-use-based complaints. SCAQMD handles idling and diesel emission rules that often overlap with noise complaints.
Are there truck idling rules?
Yes. California limits truck idling to 5 minutes and SCAQMD Rule 2305 adds warehouse indirect-source requirements that push operators toward low-idle yard operations.
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