Decibel Limits: Castro Valley vs San Leandro
How do decibel limits rules compare between Castro Valley, CA and San Leandro, CA?
Castro Valley and San Leandro have similar restriction levels.
Castro Valley, CA
Alameda County
Alameda County Noise Element sets tiered decibel limits by zoning and time of day: 60 dBA daytime and 50 dBA nighttime in residential areas, with higher limits in commercial and industrial zones.
View full Castro Valley rules →San Leandro, CA
Alameda County
San Leandro Municipal Code Title 4 (Public Welfare), Chapter 4-1, Article 11 regulates noise based on a relative standard rather than fixed absolute dBA limits. Radio, television, audio equipment, drums, and similar devices are unlawful when they exceed the ambient noise level on adjacent property by more than five (5) decibels.
View full San Leandro rules →Key Facts Comparison
| Fact | Castro Valley | San Leandro |
|---|---|---|
| Residential day | 60 dBA Leq | - |
| Residential night | 50 dBA Leq | - |
| Commercial day | 65 dBA | - |
| Industrial | 70 dBA at line | - |
| Tonal penalty | Add 5 dBA | - |
| Code Section | - | SLMC Title 4, Chapter 4-1, Article 11 |
| Standard | - | Ambient + 5 dB at receiving property line |
| Residential Planning Threshold | - | 60 dBA Ldn (General Plan Noise Element) |
| Measurement Location | - | Property line of complainant |
| First-offense Fine | - | Up to $100 (infraction) |
Highlighted rows indicate differences between cities.
Castro Valley FAQ
What is CNEL?
Community Noise Equivalent Level, a 24-hour average weighted to penalize evening and nighttime noise. Used for land use planning, not direct enforcement.
Are construction activities exempt?
Yes, during permitted hours (7am to 7pm weekdays, 8am to 6pm Saturdays). Sundays and holidays typically require special permission.
San Leandro FAQ
What is the decibel limit in San Leandro?
San Leandro does not publish a single fixed dBA limit. Under SLMC Title 4 Chapter 4-1 Article 11, amplified sound or musical instruments are unlawful if they exceed the existing ambient noise level on adjacent property by more than 5 decibels measured at the receiving property line.
How does San Leandro measure noise complaints?
Police officers use either a calibrated Type 2 sound level meter or apply the 'plainly audible' test from the property line. If the noise is more than 5 dB above background, it is a violation under SLMC Article 11.
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