Quiet Hours: Altadena vs Pomona
How do quiet hours rules compare between Altadena, CA and Pomona, CA?
Altadena and Pomona 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 →Pomona, CA
Los Angeles County
Pomona enforces quiet hours from 10 PM to 7 AM under Chapter 18, Article VII. During quiet hours, stricter noise limits of 50 dBA apply in residential zones, and sound must not be audible beyond 50 feet.
View full Pomona rules →Key Facts Comparison
| Fact | Altadena | Pomona |
|---|---|---|
| Code Section | LA County Code Ch. 12.08 (Title 12) | §§18-311, 18-312 |
| 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 PM–7 AM |
| Residential Limit | - | 50 dBA nighttime |
| Audibility Rule | - | Not audible beyond 50 ft at night |
| Enforcement | - | Code Compliance: (909) 620-2374 |
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.
Pomona FAQ
What are Pomona's quiet hours?
Quiet hours run from 10 PM to 7 AM. During this time, noise must not exceed 50 dBA in residential zones and must not be audible beyond 50 feet from its source.
Can I do construction during quiet hours?
No. Construction is prohibited between 8 PM and 7 AM on weekdays and Saturdays, and all day on Sundays and federal holidays.
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