Santa Clarita, CA Noise from Specific Sources: HVAC & Mechanical Noise (2026)
Key Facts
- Residential daytime limit
- 65 decibels at the property line
- Residential nighttime limit
- 55 decibels at the property line
- Covered equipment
- AC units, fans, pumps, refrigeration equipment
- Measuring point
- Property line, or inside a shared condo/rental unit
- Base violation class
- Misdemeanor unless charged as an infraction
Summary
Santa Clarita Municipal Code Section 11.44.070 makes it a violation to run air conditioning units, fans, pumps, or other mechanical or electrical equipment at a noise level that exceeds the ambient limits set in Section 11.44.040 at the property line, or inside a neighboring condo or rental unit. In a residential zone, that ceiling is 65 decibels by day and 55 decibels at night.
Any noise level from the use or operation of any machinery, equipment, pump, fan, air conditioning apparatus, refrigerating equipment, motor vehicle, or other mechanical or electrical device, or in repairing or rebuilding any motor vehicle, which exceeds the noise limits as set forth in Section 11.44.040 at any property line, or, if a condominium or rental units, within any condominium unit or rental unit within the complex, shall be a violation of this chapter.
Full Breakdown
070 covers noise from "any machinery, equipment, pump, fan, air conditioning apparatus, refrigerating equipment, motor vehicle, or other mechanical or electrical device," as well as noise from repairing or rebuilding a vehicle. The measuring point is the property line of the complaining property, or, for a condominium or rental building, inside the adjoining unit itself, which lets a tenant complain about a neighbor's rooftop AC condenser or pool pump even without a hard property-line measurement. 040: 65 dB during the day and 55 dB at night on residential land, and 80 dB day / 70 dB night on commercial and manufacturing land, with the quieter zone's limit controlling at a residential/commercial boundary line.
040(B) also lets those numeric limits shift for certain noise conditions, tightening the standard by five decibels for a repetitive impulsive noise or a steady whine, screech, or hum, which covers the cycling compressor noise many HVAC condensers and fans produce. 110 unless charged as an infraction, with each day of continuing excess noise counted as a separate offense that can also be abated as a public nuisance.
Violations & Fines
Operating air conditioning, refrigeration, or other mechanical equipment above the Section 11.44.040 noise limits at the property line is a misdemeanor under Section 11.44.110 unless the City charges it as an infraction. Each day the equipment keeps exceeding the limit is a separate offense, and the City may also abate the noise as a public nuisance through a court injunction under Section 11.44.120.
Frequently Asked Questions
How loud can my neighbor's air conditioner legally be?
Does a whining or humming AC unit get treated differently?
What happens if my HVAC noise complaint isn't resolved?
Sources & Official References
Other rules in Santa Clarita
California rules heatmap·Compare Santa Clarita to another location·View the California noise from specific sources overview
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