Outdoor Music: Altadena vs Downey
How do outdoor music rules compare between Altadena, CA and Downey, CA?
Downey has fewer restrictions than Altadena.
Altadena, CA
Los Angeles County
LA County Code Chapter 12.08 restricts amplified sound and outdoor music in unincorporated areas to the same exterior noise standards by zone. Loudspeakers and amplified devices are specifically regulated under Section 12.08.450.
View full Altadena rules →Downey, CA
Los Angeles County
Downey Municipal Code Section 4600 prohibits noise from radios, musical instruments, loudspeakers, or amplified sound that disturbs neighboring residents, particularly between 10 PM and 7 AM in residential zones.
View full Downey rules →Key Facts Comparison
| Fact | Altadena | Downey |
|---|---|---|
| Code Section | §12.08.450 | DMC §4600 |
| Residential Limit | 50 dBA day / 45 dBA night | - |
| Measurement | At property line | - |
| Fine | Up to $1,000 | - |
| Night Restriction | - | 10 PM–7 AM in residential zones |
| Threshold | - | 100 dBA at 25 ft (prima facie) |
| Standard | - | Disturbing neighboring inhabitants |
| Report | - | Downey PD: (562) 861-0771 |
Highlighted rows indicate differences between cities.
Altadena FAQ
Can I play amplified music outdoors in unincorporated LA County?
Yes, but the sound cannot exceed exterior noise standards at the neighboring property line — 50 dBA during the day and 45 dBA at night in residential zones under Section 12.08.450.
Do I need a permit for an outdoor event with music?
Large outdoor events with amplified sound in unincorporated LA County may require a temporary use permit from the Department of Regional Planning, especially if attendance exceeds normal gathering sizes.
Downey FAQ
Can I play music outside in Downey?
Outdoor music is allowed but must not disturb neighboring residents. Between 10 PM and 7 AM, amplified sound in residential zones is particularly restricted under Section 4600.
What if my neighbor plays loud music at night?
Contact the Downey Police Department non-emergency line at (562) 861-0771 to file a noise complaint. Officers can issue citations for violations of Section 4600.
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