Decibel Limits: Mountain View vs San Jose
How do decibel limits rules compare between Mountain View, CA and San Jose, CA?
Mountain View has fewer restrictions than San Jose.
Mountain View, CA
Santa Clara County
Mountain View Chapter 21 sets specific decibel thresholds varying by zoning district and time of day, measured at property lines with standardized equipment.
View full Mountain View rules →San Jose, CA
Santa Clara County
San Jose enforces numeric decibel limits under Municipal Code Chapter 20.100, with residential zones capped at 55 dBA daytime and 50 dBA nighttime measured at the receiving property line. Commercial and industrial zones carry higher ceilings. Exceedances of 5 dBA for any 15-minute period trigger violation, and sustained exceedances prompt Code Enforcement action.
View full San Jose rules →Key Facts Comparison
| Fact | Mountain View | San Jose |
|---|---|---|
| Residential day | 55 dBA | - |
| Residential night | 45 dBA | - |
| Commercial day | 65 dBA | - |
| Industrial day | 70 dBA | - |
| Meter standard | ANSI Type 1 or 2 | - |
| - | - |
Highlighted rows indicate differences between cities.
Mountain View FAQ
How do I know if something exceeds the limit?
Use a calibrated sound meter app for a rough estimate, then request a formal measurement from Code Enforcement for enforcement action.
Are short loud noises okay?
Short peaks are measured against an Lmax threshold about 10 to 15 dBA above the baseline limit.
San Jose FAQ
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