Quiet Hours: Altadena vs El Monte
How do quiet hours rules compare between Altadena, CA and El Monte, CA?
Altadena and El Monte have similar restriction levels.
Altadena, CA
Los Angeles County
Altadena is unincorporated, so LA County Title 12 Chapter 12.08 (Noise Control) applies. Nighttime exterior limits run 10:00 p.m. to 7:00 a.m. with stricter dB caps; daytime runs 7:00 a.m. to 10:00 p.m.
View full Altadena rules →El Monte, CA
Los Angeles County
El Monte regulates noise under Chapter 8.36 (Noise Control). Daytime hours are 7 AM–10 PM; nighttime is 10 PM–7 AM. Noise may not exceed ambient levels by more than 5 dB for 15 cumulative minutes at property lines.
View full El Monte rules →Key Facts Comparison
| Fact | Altadena | El Monte |
|---|---|---|
| Code Section | LA County Code Ch. 12.08 (Title 12) | EMMC §8.36.040 |
| Nighttime Window | 10:00 p.m. – 7:00 a.m. | - |
| Residential Night Limit | 45 dBA (R-1) | - |
| Residential Day Limit | 50 dBA (R-1) | - |
| Ambient Exceedance Rule | +5 dB over ambient | - |
| Quiet Hours | - | 10:00 PM – 7:00 AM |
| Noise Limit | - | Ambient + 5 dB for 15 min |
| Interior Standard | - | Multi-family included |
Highlighted rows indicate differences between cities.
Altadena FAQ
What are Altadena's quiet hours?
10 p.m. to 7 a.m. under LA County Code Ch. 12.08 — Altadena is unincorporated so LA County's noise ordinance applies.
How loud can my backyard be at night?
Single-family residential exterior noise is capped at 45 dBA from 10 p.m. to 7 a.m. per Section 12.08.390.
El Monte FAQ
What are the quiet hours in El Monte?
El Monte regulates noise under Chapter 8.36 (Noise Control). Daytime hours are 7 AM–10 PM; nighttime is 10 PM–7 AM. Noise may not exceed ambient levels by more than 5 dB for 15 cumulative minutes at property lines.
What happens if I violate the noise ordinance in El Monte?
Quiet Hours: 10:00 PM – 7:00 AM. Noise Limit: Ambient + 5 dB for 15 min. Interior Standard: Multi-family included. Code Section: EMMC §8.36.040.
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