Industrial Noise: Carson vs Downey
How do industrial noise rules compare between Carson, CA and Downey, CA?
Carson and Downey have similar restriction levels.
Carson, CA
Los Angeles County
Carson adopts LA County Code Title 12 Chapter 12.08 by reference (Carson Municipal Code Art. 4, Ch. 5). Under §12.08.390 and the Noise Zone designations in §12.08.380, industrial property (Zone III / M zones) has an exterior noise standard of 70 dBA at all hours, measured at the property line of the receiving property. The standard may not be exceeded by more than 5 dBA for any 15-minute cumulative period or more than 8 dBA for any 5-minute period (per the graduated overage table in §12.08.390). Where industrial sites abut residential zones (Zone I / R), the more restrictive residential standard (50 dBA day / 45 dBA night) applies at the residential receptor's property line. Stationary source air emissions from Marathon Carson and Phillips 66 LA Refinery are separately regulated by South Coast AQMD Rule 402 (Nuisance) and Rule 401 (Visible Emissions), and the SCAQMD complaint line (1-800-CUT-SMOG) handles refinery and industrial nuisance noise complaints.
View full Carson rules →Downey, CA
Los Angeles County
Industrial noise in Downey must not exceed established ambient levels by more than 5 dBA at the receiving property line. Corrective factors apply during daytime hours (7 AM - 10 PM).
View full Downey rules →Key Facts Comparison
| Fact | Carson | Downey |
|---|---|---|
| Adopting ordinance | CMC Art. 4 Ch. 5 (adopts LA County Code Title 12 Ch. 12.08) | - |
| Industrial exterior limit | 70 dBA at all hours (Zone III, LA County Code §12.08.390) | - |
| Measurement point | Property line of receiving property | - |
| Industrial-to-residential | 50 dBA day / 45 dBA night applies at residential receptor | - |
| 5-min exceedance cap | +15 dBA above base standard | - |
| Air-emission nuisance rule | SCAQMD Rule 402 (Public Nuisance) | - |
| Complaint lines | Carson Code Enforcement (310-952-1768); SCAQMD 1-800-CUT-SMOG (1-800-288-7664) | - |
| Worker noise | Cal/OSHA 8 CCR §5096 — 85 dBA TWA action level | - |
| Limit | - | Ambient +5 dBA at property line |
| Daytime | - | 7 AM - 10 PM with corrective factors |
| Nighttime | - | Stricter limits 10 PM - 7 AM |
| Enforcement | - | Code Enforcement |
Highlighted rows indicate differences between cities.
Carson FAQ
What is the industrial noise limit in Carson at night?
70 dBA at all hours when measured at another industrial property line, but only 45 dBA if the receiving property is residential (Zone I) between 10 p.m. and 7 a.m., per LA County Code §12.08.390 (adopted by Carson).
Where do I complain about refinery noise?
For air-emission-related nuisance noise (flaring, hissing, steam venting at Marathon or Phillips 66), call South Coast AQMD at 1-800-CUT-SMOG (1-800-288-7664). For mechanical or vehicle-related industrial noise, contact Carson Code Enforcement (310-952-1768) or the LA County Sheriff's Carson Station (310-830-1123).
Do warehouse and logistics operations have setback rules near homes?
Yes — AB 98 (2024, Cal. Gov. Code §65913.5 et seq.) sets statewide minimum setbacks for new logistics-use buildings near sensitive receptors. Carson zoning (CMC Art. IX Ch. 1) governs M-zone siting; new warehousing also triggers CEQA noise study requirements.
Are industrial property owners liable for noise from their tenants?
Yes — LA County Code §12.08.010 imposes liability on the person owning, operating, or controlling the noise source. The Health Officer or city may issue cease-and-abate notices to both tenant and property owner.
Downey FAQ
What are the industrial noise limits in Downey?
Industrial and commercial operations must stay below 70 dBA during the day and 60 dBA at night, measured at the nearest residential property line.
How do I report industrial noise in Downey?
File a complaint with Downey Code Enforcement. They may conduct sound level measurements to determine if the source exceeds permitted levels.
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