Decibel Limits: Altadena vs Pomona
How do decibel limits rules compare between Altadena, CA and Pomona, CA?
Altadena and Pomona 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 →Pomona, CA
Los Angeles County
Pomona City Code Chapter 18, Article VII (Noise and Vibration Control) establishes exterior noise standards measured in dBA. Residential zones have a daytime limit of 60 dBA (7 AM-10 PM) and nighttime limit of 50 dBA (10 PM-7 AM) at the property line.
View full Pomona rules →Key Facts Comparison
| Fact | Altadena | Pomona |
|---|---|---|
| Code Section | LA County 12.08.390 | Ch. 18, Art. VII, §§18-301–18-315 |
| 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 | - |
| Residential Day | - | 60 dBA (7 AM–10 PM) |
| Residential Night | - | 50 dBA (10 PM–7 AM) |
| Commercial Day | - | 70 dBA (7 AM–10 PM) |
| Measurement | - | A-weighted, slow response |
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.
Pomona FAQ
What are Pomona's residential noise limits?
Under Section 18-311, single-family residential zones allow 60 dBA during daytime (7 AM-10 PM) and 50 dBA at night (10 PM-7 AM), measured at the property line.
How are noise levels measured in Pomona?
All measurements use A-weighted sound level meters at slow response, per Section 18-301 definitions.
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