Generator Noise: Mountain View vs San Jose
How do generator noise rules compare between Mountain View, CA and San Jose, CA?
Mountain View has fewer restrictions than San Jose.
Mountain View, CA
Santa Clara County
Generators in Santa Clara County are allowed for emergency use during PSPS and outages, but routine testing must meet 55/45 dBA limits. Permanent standby units need building permits.
View full Mountain View rules →San Jose, CA
Santa Clara County
San Jose regulates generator noise under SJMC Chapter 10.16 general noise provisions. Portable and standby generators must not produce noise plainly audible past the property line during nighttime hours (10 PM–7 AM) or exceed 75 dB(A) at the property boundary in residential areas.
View full San Jose rules →Key Facts Comparison
| Fact | Mountain View | San Jose |
|---|---|---|
| Emergency Use | Exempt during outages and PSPS | Generally exempt |
| Routine Testing | Daytime only, 55 dBA limit | - |
| Permanent Install | Building and mechanical permits | - |
| Enclosure Standard | 60 dBA at 23 feet near property lines | - |
| Portable Units | Allowed during emergencies | - |
| Night Hours | - | 10 PM – 7 AM restricted |
| Limit | - | 75 dB(A) at property line |
| Code | - | SJMC Ch. 10.16, Title 20 |
Highlighted rows indicate differences between cities.
Mountain View FAQ
Can I run a generator all night during a PSPS?
Yes. The emergency exemption permits generator operation during an active utility outage.
Do I need a permit for a standby generator?
Yes, permanent installations require building, mechanical, and often electrical permits, plus compliance with noise limits.
San Jose FAQ
Can I run a generator at night in San Jose?
Generator noise must not be plainly audible past the property line between 10 PM and 7 AM or exceed 75 dB(A). Emergency use during power outages is generally exempt.
Where can I place a standby generator on my property?
Permanent generators must comply with residential zoning setbacks and be screened from view per Title 20 requirements.
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