Quiet Hours: Altadena vs Lancaster
How do quiet hours rules compare between Altadena, CA and Lancaster, CA?
Altadena and Lancaster 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 →Lancaster, CA
Los Angeles County
Lancaster prohibits unnecessary loud, prolonged, or unusual noises that cause physical discomfort to neighborhood inhabitants under Sec. 8.24.030. Standard is qualitative (no fixed dBA), enforced by complaint.
View full Lancaster rules →Key Facts Comparison
| Fact | Altadena | Lancaster |
|---|---|---|
| Code Section | LA County Code Ch. 12.08 (Title 12) | - |
| 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 | - |
| Code | - | Sec. 8.24.030 |
| Standard | - | Qualitative — annoying |
| Enforcement | - | Complaint-based |
| Topic | - | Quiet Hours |
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.
Lancaster FAQ
What does Lancaster's noise ordinance prohibit?
Sec. 8.24.030 bars any unnecessary noise that is harsh, prolonged, unnatural, or unusual in time or place such that it causes physical discomfort to neighborhood inhabitants of ordinary sensitivity.
Does Lancaster have specific decibel limits?
Chapter 8.24 uses a qualitative standard rather than fixed decibel thresholds. Officers assess whether the noise is unreasonable in context, time, and location.
Compare other topics
See how Altadena and Lancaster compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool