Amplified Music & Events: Altadena vs Downey
How do amplified music & events rules compare between Altadena, CA and Downey, CA?
Altadena and Downey have similar restriction levels.
Altadena, CA
Los Angeles County
Amplified music and sound devices in unincorporated LA County are regulated under Chapter 12.08 (Noise Control). Residential areas: 45 dB nighttime (10 PM-7 AM), 50 dB daytime. Sound amplifying equipment in or within 500 ft of residential zones is restricted for commercial purposes.
View full Altadena rules →Downey, CA
Los Angeles County
Downey prohibits amplified music that exceeds ambient noise levels by more than 5 dBA at the property line. Quiet hours from 10 PM to 7 AM carry stricter limits.
View full Downey rules →Key Facts Comparison
| Fact | Altadena | Downey |
|---|---|---|
| Residential Night | 45 dB (10 PM-7 AM) | - |
| Residential Day | 50 dB (7 AM-10 PM) | - |
| Commercial Use | Restricted near residential | - |
| Reference | Title 12, Chapter 12.08 | - |
| Standard | - | Ambient +5 dBA at property line |
| Quiet Hours | - | 10 PM - 7 AM |
| Enforcement | - | Code Enforcement / Police |
| State Fallback | - | CA Penal Code 415 |
Highlighted rows indicate differences between cities.
Altadena FAQ
What are the noise hours for amplified music in LA County?
Amplified sound must not be audible beyond the property line between 10 PM and 7 AM weekdays, or 10 PM and 8 AM weekends. Daytime amplified sound cannot exceed 5 dB above ambient noise at the property line.
Do I need a permit for a party with amplified music?
Not for an occasional private party that stays within noise limits. Large events or recurring parties may require a Temporary Use Permit from the Department of Regional Planning at (213) 974-6411.
How do I file a noise complaint about amplified music?
Call the LA County Sheriff's non-emergency line at (323) 267-4800 for immediate noise disturbances. For ongoing issues, file a code enforcement complaint at (888) 756-2700.
Downey FAQ
Can I play amplified music at a Downey party?
Music must not be audible at 50 feet after 10 PM. Any noise exceeding 100 dB at 25 feet is an automatic violation at any time.
Are loudspeakers regulated in Downey?
Yes. Section 4603 specifically regulates loudspeakers and amplifiers used for advertising. Section 4604 covers outdoor paging systems.
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