Decibel Limits: Altadena vs West Covina
How do decibel limits rules compare between Altadena, CA and West Covina, CA?
Altadena and West Covina have similar restriction levels.
Altadena, CA
Los Angeles County
Exterior noise in Altadena's residential zones is capped at 50 dBA daytime / 45 dBA nighttime (single-family); 55/50 dBA (multi-family); 60/55 dBA commercial; 70 dBA all hours industrial.
View full Altadena rules →West Covina, CA
Los Angeles County
West Covina Municipal Code Article IV (Sections 15-91 through 15-97) prohibits loud, unnecessary, or unusual noise in residential zones. Noise plainly audible at 50 feet from the property line is presumed a violation. Standards are reduced by 5 dB for tones, repetitive noise, music, or speech.
View full West Covina rules →Key Facts Comparison
| Fact | Altadena | West Covina |
|---|---|---|
| Code Section | LA County 12.08.390 | - |
| R-1 Day Limit | 50 dBA | - |
| R-1 Night Limit | 45 dBA | - |
| Multi-family Day/Night | 55 / 50 dBA | - |
| Commercial Day/Night | 60 / 55 dBA | - |
| Audibility Test | - | 50 ft from property line |
| Tone/Music Penalty | - | -5 dB reduction |
| Engine Curfew | - | 8 PM – 8 AM |
| Code | - | WCMC Art. IV §15-91–97 |
Highlighted rows indicate differences between cities.
Altadena FAQ
What's the legal decibel limit at my Altadena property line?
50 dBA day / 45 dBA night for single-family residential under LA County Code 12.08.390.
West Covina FAQ
How is a noise violation determined in West Covina?
If noise is plainly audible at 50 feet from the property line, it is presumed a violation under Section 15-94. For tonal, repetitive, music, or speech content, the threshold is reduced by 5 dB.
Can I run a leaf blower at night in West Covina?
No. Between 8 PM and 8 AM, operating gasoline-powered engines like leaf blowers, mowers, or chain saws within a residential zone or within 500 feet is unlawful under Section 15-95.
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