Santa Rosa, CA Noise from Specific Sources: HVAC & Mechanical Noise (2026)
Key Facts
- Covered equipment
- Machinery, pumps, fans, air-conditioning apparatus
- Noise threshold
- More than 5 dB above ambient base level
- Measurement point
- Property line of the affected property
- Meter standard
- A-weighted sound level meter (Section 17-16.020)
- Penalty
- Misdemeanor; continuing violation is a nuisance
Summary
Running an air conditioner, pump, fan, or other mechanical equipment loud enough to push noise at a neighbor's property line more than five decibels above the ambient base level is illegal in Santa Rosa. Municipal Code Section 17-16.120 names air-conditioning apparatus specifically, tying HVAC noise to the same decibel table used for the rest of Chapter 17-16.
§ 17-16.120. Machinery and equipment. It is unlawful for any person to operate any machinery, equipment, pump, fan, air-conditioning apparatus or similar mechanical device in any manner so as to create any noise which would cause the noise level at the property line of any property to exceed the ambient base noise level by more than five decibels.
Full Breakdown
030. That table sets the baseline HVAC noise is measured against: a condenser running next to an R1 or R2 home can't push the property-line reading past roughly 50 decibels overnight (45 dB ambient plus the 5 dB margin) or past 60 decibels during the day (55 dB ambient plus 5 dB). Multi-family, commercial, and industrial zones use the correspondingly higher ambient figures from the same table. 010 definitions, excluding isolated identifiable sources like the equipment being tested. The rule applies to both residential and commercial HVAC installations and to other continuously operating mechanical equipment, such as pool pumps and fans, not just central air conditioners.
Because the standard is a decibel differential rather than a flat number, resolving a noisy condenser complaint near a shared lot line requires an actual sound-level reading to confirm the unit exceeds the ambient-plus-five-decibel ceiling before code enforcement can act.
Violations & Fines
A violation of Section 17-16.120 is a misdemeanor under Section 17-16.050, with each day the excess noise continues after a notice to desist counted as a separate offense. The equipment's operation can also be declared a public nuisance under Section 17-16.060, letting a court issue a summary restraining order or injunction against continued use of the noisy machinery.
Frequently Asked Questions
Is my air conditioner allowed to run loud at night in Santa Rosa?
Does the HVAC noise rule apply to businesses too?
What proof does code enforcement need to cite a loud condenser?
Sources & Official References
Other rules in Santa Rosa
California rules heatmap·Compare Santa Rosa to another location·View the California noise from specific sources overview
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