Decibel Limits: Lancaster vs Pomona
How do decibel limits rules compare between Lancaster, CA and Pomona, CA?
Pomona has fewer restrictions than Lancaster.
Lancaster, CA
Los Angeles County
LA County Code Section 12.08.390 establishes tiered exterior noise standards by zone for unincorporated areas. Residential limits are 50 dBA day and 45 dBA night. Commercial zones allow 60/55 dBA and industrial zones allow 70 dBA at all times.
View full Lancaster rules →Pomona, CA
Los Angeles County
Pomona City Code Chapter 18, Article VII (Noise and Vibration Control) establishes exterior noise standards measured in dBA. Residential zones have a daytime limit of 60 dBA (7 AM-10 PM) and nighttime limit of 50 dBA (10 PM-7 AM) at the property line.
View full Pomona rules →Key Facts Comparison
| Fact | Lancaster | Pomona |
|---|---|---|
| Code Section | §12.08.390 | Ch. 18, Art. VII, §§18-301–18-315 |
| Residential Day | 50 dBA | 60 dBA (7 AM–10 PM) |
| Residential Night | 45 dBA | 50 dBA (10 PM–7 AM) |
| Commercial Day | 60 dBA | 70 dBA (7 AM–10 PM) |
| Industrial | 70 dBA always | - |
| Measurement | - | A-weighted, slow response |
Highlighted rows indicate differences between cities.
Lancaster FAQ
What are the decibel limits in unincorporated LA County?
Residential areas are limited to 50 dBA during the day and 45 dBA at night. Commercial zones allow 60 dBA daytime and 55 dBA nighttime. Industrial zones permit 70 dBA at all times.
How are noise violations measured in LA County?
Noise is measured at the property line of the affected party using the A-weighted decibel scale. Duration matters too — exceeding limits for more than 30 minutes per hour triggers Standard No. 1.
Pomona FAQ
What are Pomona's residential noise limits?
Under Section 18-311, single-family residential zones allow 60 dBA during daytime (7 AM-10 PM) and 50 dBA at night (10 PM-7 AM), measured at the property line.
How are noise levels measured in Pomona?
All measurements use A-weighted sound level meters at slow response, per Section 18-301 definitions.
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