Amplified Music & Events: Altadena vs South Gate
How do amplified music & events rules compare between Altadena, CA and South Gate, CA?
Altadena has fewer restrictions than South Gate.
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 →South Gate, CA
Los Angeles County
South Gate has explicit, numeric limits on amplified music. Under SGMC §7.44.020.02(b), any radio, television, record player, tape or video recorder, or other electronic entertainment device that can be heard more than 225 feet from the source is an 'offensive portable noise emission' and a misdemeanor. The same section sets a decibel scale: 70 dB at 10 feet, 68 dB at 15 ft, 65 dB at 20 ft, 62 dB at 25 ft, 60 dB at 30 ft, 58 dB at 35 ft. A separate 'loud party' rule under §7.44.020.02(c) makes any gathering of two or more people audible 30 feet beyond the property boundary unlawful.
View full South Gate rules →Key Facts Comparison
| Fact | Altadena | South Gate |
|---|---|---|
| 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 | - |
| Plain-audibility limit | - | 225 ft from source (SGMC §7.44.020.02(b)) |
| Decibel limit at 25 ft | - | 62 dB max (slowed response) |
| Decibel limit at 35 ft | - | 58 dB max (slowed response) |
| Loud-party rule | - | 2+ people audible 30 ft past property line (§7.44.020.02(c)) |
| Penalty | - | Misdemeanor; each hour a separate offense (§7.44.050) |
| Equipment scope | - | Includes Bluetooth speakers and fixed home stereos |
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.
South Gate FAQ
Can South Gate police shut down my backyard party?
Yes. Under §7.44.020.02(c), if two or more people's noise can be heard 30 feet beyond your property line, the gathering is an offensive portable noise emission and police can order it shut down. Continued operation can be charged as a misdemeanor with each hour a separate count under §7.44.050(a).
What is the actual decibel limit for outdoor music in South Gate?
§7.44.020.02(b) sets a sliding scale: 70 dB measured at 10 feet from the source, 65 dB at 20 ft, 62 dB at 25 ft, 60 dB at 30 ft, and 58 dB at 35 ft, on a slow-response meter. Independently, if the sound is plainly audible more than 225 feet from the source, that alone is a violation.
Do these rules apply during the day too?
Yes. Chapter 7.44 does not specify quiet-hours windows — the audibility, decibel, and 30-foot party limits apply 24 hours a day. Time of day can affect the reasonable-person analysis under §7.44.020.02(a) for borderline cases, but the bright-line distance and decibel limits in (b) and (c) are time-independent.
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