Decibel Limits: Altadena vs El Monte
How do decibel limits rules compare between Altadena, CA and El Monte, CA?
Altadena and El Monte 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 →El Monte, CA
Los Angeles County
El Monte Municipal Code Chapter 8.36 (Noise Control) establishes exterior noise standards. The city L50 standard is 65 dB daytime (7 AM-10 PM) and 60 dB nighttime (10 PM-7 AM) for residential zones. Noise exceeding ambient by more than 5 dBA for 15 cumulative minutes is a violation.
View full El Monte rules →Key Facts Comparison
| Fact | Altadena | El Monte |
|---|---|---|
| Code Section | LA County 12.08.390 | EMMC Ch. 8.36 |
| 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 | - | 65 dBA (7 AM–10 PM) |
| Residential Night | - | 60 dBA (10 PM–7 AM) |
| Ambient +5 Rule | - | May not exceed ambient +5 dBA for 15 min |
| Measurement | - | A-weighted at property line |
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.
El Monte FAQ
What are El Monte's residential noise limits?
65 dBA during daytime (7 AM-10 PM) and 60 dBA at night (10 PM-7 AM) under Chapter 8.36. Noise exceeding ambient by more than 5 dBA for 15 cumulative minutes is a violation.
How is noise measured in El Monte?
Using A-weighted sound level meters at the receiving property line, as specified in Chapter 8.36.
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