Norwalk vs Santa Monica
How do decibel limits rules compare between Norwalk, CA and Santa Monica, CA?
Norwalk and Santa Monica have similar restriction levels.
Norwalk, 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 Norwalk rules →Santa Monica, CA
Los Angeles County
Santa Monica Municipal Code Section 4.12.060 establishes three noise zones with specific dBA limits. Residential Zone I limits are 50 dBA nighttime and 60 dBA daytime (15-minute Leq). Non-residential Zone II is 60/65 dBA. Industrial Zone III is 70 dBA at all times. A 5 dBA penalty applies for tonal, impulsive, music, or speech content.
View full Santa Monica rules →Key Facts Comparison
| Fact | Norwalk | Santa Monica |
|---|---|---|
| Code Section | §12.08.390 | - |
| Residential Day | 50 dBA | - |
| Residential Night | 45 dBA | - |
| Commercial Day | 60 dBA | - |
| Industrial | 70 dBA always | - |
| Zone I Day | - | 60 dBA (15-min Leq) |
| Zone I Night | - | 50 dBA (15-min Leq) |
| Zone II Day | - | 65 dBA (15-min Leq) |
| Code | - | SMMC §4.12.060 |
Highlighted rows indicate differences between cities.
Norwalk 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.
Santa Monica FAQ
What are the noise limits in Santa Monica residential areas?
Noise Zone I (residential) limits are 60 dBA during the day (7 AM–10 PM weekdays, 8 AM–10 PM weekends) and 50 dBA at night, measured as a 15-minute equivalent noise level. These are reduced by 5 dBA for tonal noise, music, or speech.
How is noise measured in Santa Monica?
Using A-weighted decibels (dBA) as a 15-minute equivalent noise level (Leq) and a 5-minute continuous noise level. Measurements are taken at the property line of the affected property.
Compare other topics
See how Norwalk and Santa Monica 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