Decibel Limits: Mountain View vs Sunnyvale
How do decibel limits rules compare between Mountain View, CA and Sunnyvale, CA?
Mountain View and Sunnyvale have similar restriction levels.
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 →Sunnyvale, CA
Santa Clara County
Sunnyvale Chapter 19.48 sets exterior noise limits of 60 dBA day and 50 dBA night for residential, 65 dBA for commercial, and 70 dBA for industrial, measured at the receiving property line.
View full Sunnyvale rules →Key Facts Comparison
| Fact | Mountain View | Sunnyvale |
|---|---|---|
| Residential day | 55 dBA | - |
| Residential night | 45 dBA | - |
| Commercial day | 65 dBA | - |
| Industrial day | 70 dBA | - |
| Meter standard | ANSI Type 1 or 2 | - |
| Residential day/night | - | 60 / 50 dBA |
| Commercial day/night | - | 65 / 60 dBA |
| Industrial day/night | - | 70 / 65 dBA |
| Tonal noise penalty | - | 5 dBA adjustment |
| Measurement | - | Type 2 meter, 15 min |
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.
Sunnyvale FAQ
How does the city measure noise in practice?
A Code Enforcement officer uses a calibrated meter at the receiving property line and averages readings over 15 minutes, applying tonal or impulsive adjustments.
Which zone limits apply when sound crosses a boundary?
The receiving zone sets the limit. A commercial HVAC unit next to residential must meet the 60/50 dBA residential thresholds at that property line.
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