10 county-level rules, plus city-specific rules for 11 cities in Orange County, California.
Verified from official government sources
Unincorporated Orange County does not set a single citywide curfew clock. Instead, Division 6 of Title 4 of the Codified Ordinances sets quieter nighttime exterior noise limits from 10:00 p.m. to 7:00 a.m. (50 dB(A)) than during the day (55 dB(A)), so the practical 'quiet hours' run overnight.
In unincorporated Orange County, construction, repair, remodeling, and grading are exempt from the noise limits only if they do NOT take place between 8:00 p.m. and 7:00 a.m. on weekdays including Saturday, or at any time on Sunday or a Federal holiday, under Codified Ordinances Section 4-6-7(e).
Unincorporated Orange County regulates barking dogs through OC Animal Care, not the dB-based noise code. A 'barking dog' is one that barks, bays, cries, or howls for an extended period disturbing any person: incessantly for 30 minutes or more, or intermittently totaling 60 minutes or more, in any 24-hour period.
Unincorporated Orange County has no separate leaf-blower ordinance. Leaf blowers fall under the County noise code's property-maintenance hours (Sec. 4-6-7(i)), and statewide California law (AB 1346 / CARB) now bars sales of new gas-powered leaf blowers and other small off-road engines.
California AB 1346 (Berman, 2021) — Air pollution: small off-road engines (Health & Safety Code § 43018.11)
(a) The Legislature finds and declares all of the following: (1) Small off-road engines (SORE), which are used primarily in lawn and garden equipment, emit high levels of air pollutants, including oxides of nitrogen (NOx), reactive organic gases (ROG), and particulate matter (PM). NOx and ROG together contribute to formation of ozone, a criteria pollutant with a national ambient air quality sta...
In unincorporated Orange County, amplified music is treated harshly under the noise code: because music is an enumerated noise type, the exterior limits in Section 4-6-5 drop by 5 dB(A) to 50 dB(A) by day and 45 dB(A) at night. Public dances and shows need a County license.
Aircraft noise is not regulated by Orange County's local noise code. The County ordinance defers to preempting State and Federal law (Sec. 4-6-7(j)), and aircraft and airspace noise is controlled by the FAA, while California regulates airport-proprietor noise standards.
Industrial and commercial machinery in unincorporated Orange County is regulated as a 'fixed noise source' under the Codified Ordinances. Such equipment must keep noise at neighboring residential property within the Section 4-6-5 limits (55 dB(A) day, 50 dB(A) night), with graduated duration allowances.
Unincorporated Orange County uses a dB(A)-based noise code. Exterior residential limits are 55 dB(A) (7 a.m.-10 p.m.) and 50 dB(A) (10 p.m.-7 a.m.); interior limits are 55 dB(A) day and 45 dB(A) night, with graduated time allowances under Codified Ordinances Sections 4-6-5 and 4-6-6.
Outdoor music in unincorporated Orange County must meet the music-reduced noise limits (about 50 dB(A) day, 45 dB(A) night at neighboring homes), and organized outdoor gatherings, public dances, and shows are exempt only when conducted under a County license per Codified Ordinances Section 4-6-7(b).
Vehicle noise on public roads in unincorporated Orange County is governed mainly by California state law, not the County code. The California Vehicle Code requires adequate mufflers, bars modified or amplified exhaust, and treats a sound level over 95 dB(A) for light vehicles as non-compliant.
11 cities in Orange County have their own noise ordinances rules. Each link goes to that city's dedicated page with code citations.
9 verified rules • Aircraft Noise, Amplified Music & Events
9 verified rules • Aircraft Noise, Amplified Music & Events
9 verified rules • Aircraft Noise, Amplified Music & Events
9 verified rules • Aircraft Noise, Amplified Music & Events
9 verified rules • Aircraft Noise, Amplified Music & Events
9 verified rules • Aircraft Noise, Amplified Music & Events
7 verified rules • Aircraft Noise, Amplified Music & Events
9 verified rules • Aircraft Noise, Amplified Music & Events
9 verified rules • Aircraft Noise, Amplified Music & Events
9 verified rules • Aircraft Noise, Amplified Music & Events
1 verified rule • Quiet Hours
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