Industrial Noise: Berkeley vs Castro Valley
How do industrial noise rules compare between Berkeley, CA and Castro Valley, CA?
Castro Valley has fewer restrictions than Berkeley.
Berkeley, CA
Alameda County
Industrial and commercial noise in Berkeley is limited to 65 dB daytime and 55 dB nighttime at adjacent residential property lines under BMC 13.40, with BAAQMD Reg 5 supplementing state rules.
View full Berkeley rules →Castro Valley, CA
Alameda County
Industrial and manufacturing noise in unincorporated Alameda County is regulated through zoning-based decibel limits, conditional use permits, and CEQA analysis. Stationary sources must not exceed 70 dBA at industrial property lines or intrude into adjacent residential zones.
View full Castro Valley rules →Key Facts Comparison
| Fact | Berkeley | Castro Valley |
|---|---|---|
| Daytime limit | 65 dBA at residential line | - |
| Nighttime limit | 55 dBA at residential line | - |
| Industrial zone | West Berkeley | - |
| Supplemental rule | BAAQMD Regulation 5 | - |
| Remedies | Acoustic studies required | - |
| Industrial limit | - | 70 dBA property line |
| At residential boundary | - | 60 day / 50 night dBA |
| CEQA metric | - | Ldn and CNEL |
| Permit tool | - | Conditional Use Permit |
| Enforcement | - | Environmental Health and Sheriff |
Highlighted rows indicate differences between cities.
Berkeley FAQ
Can a business run 24-hour HVAC in Berkeley?
Only if rooftop and exterior equipment meets the 55 dBA nighttime limit at the nearest residential property line.
What if I live next to a compliant business that is still loud?
Even compliant businesses may be required to install additional attenuation if a pattern of complaints is documented.
Castro Valley FAQ
Do 24/7 operations need special approval?
Yes. Round-the-clock industrial operations adjacent to residential zones typically require a conditional use permit with specific nighttime noise conditions.
How is compliance measured?
With a calibrated Type 1 or Type 2 sound level meter at the receiving property line, using one-hour Leq or short-term maximums depending on the standard.
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