Noise from Specific Sources in Orange County, CA (2026)

2 county-level rules, plus city-specific rules for 8 cities in Orange County, California.

Verified from official government sources

Note: These county rules apply to unincorporated areas of Orange County. If you live within an incorporated city, that city's own rules apply: see the city list below.

HVAC & Mechanical Noise

In unincorporated Orange County, air conditioners and other equipment noise sources must stay within the county's Noise Zone 1 limits: 55 dB(A) daytime and 50 dB(A) nighttime on neighboring residential property, enforced by the Sheriff and Building Official.

Orange County HVAC Equipment Noise Limits

Some Restrictions

Orange County Codified Ordinances § 4-6-5

1 55 dB(A) 7:00 a.m.—10:00 p.m. 50 dB(A) 10:00 p.m.— 7:00 a.m. ... It shall be unlawful for any person at any location within the unincorporated area of the County to create any noise, or to allow the creation of any noise on property owned, leased, occupied, or otherwise controlled by such person, when the foregoing causes the noise level, when measured on any other residential property, eithe...

Full ordinance details →Official source ↗

Generator Noise

In unincorporated Orange County, portable and standby generators are classified as fixed noise sources under Division 6 and must meet the 55/50 dB(A) exterior noise limits set for Noise Zone 1.

Orange County Generator Noise Limits (Unincorporated)

Some Restrictions

Orange County Codified Ordinances § 4-6-2

Fixed noise source shall mean a stationary device which creates sounds while fixed or motionless, including but not limited to industrial and commercial machinery and equipment, pumps, fans, compressors, generators, air conditioners and refrigeration equipment.

Full ordinance details →Official source ↗