10 rules for unincorporated Mendocino County, California.
Verified from official government sources
Until 2026 unincorporated Mendocino County had no general noise ordinance. The Board of Supervisors adopted Ordinance No. 4558, adding Chapter 8.100 (Noise Control Regulations) to the County Code on April 7, 2026. It sets nighttime quiet hours of 10:00 p.m. to 7:00 a.m. countywide in unincorporated areas.
Mendocino County's new Chapter 8.100 noise ordinance (adopted April 2026) focuses on nighttime quiet hours of 10:00 p.m. to 7:00 a.m. and does not set out a separate, detailed construction-hours schedule in published reporting. Reported coverage does not confirm specific permitted construction times for the unincorporated county.
Under the county's new Chapter 8.100 noise ordinance, barking dogs are typically referred to Animal Control rather than handled as a general noise infraction by the Sheriff. Animal noise in unincorporated Mendocino County is addressed through animal control and nuisance channels rather than a decibel standard.
Unincorporated Mendocino County has no special leaf-blower ban or dedicated gas-blower restriction in published sources. Leaf-blower noise falls under the general Chapter 8.100 noise rules adopted in 2026, which set nighttime quiet hours of 10:00 p.m. to 7:00 a.m.
Mendocino County's Chapter 8.100 noise ordinance (Ordinance 4558, adopted April 7, 2026) specifically targets amplified sound. Between 10:00 p.m. and 7:00 a.m., sound from radios, sound amplifiers and musical devices or instruments may not exceed 60 decibels (continuous) or 75 decibels (intermittent) measured from an adjacent residential property.
Mendocino County cannot regulate aircraft-in-flight noise. Federal law preempts local control of aircraft operations, flight paths and overflight noise, so the county's Chapter 8.100 noise ordinance does not apply to aircraft in the air. Concerns about overflights generally go to the FAA.
Industrial-zone noise in unincorporated Mendocino County is shaped by the county's Right to Industry Ordinance (County Code Chapter 6.35), which protects established industrial operations from nuisance claims. The new Chapter 8.100 noise ordinance specifically exempts activities protected by the right-to-industry provisions.
Mendocino County's Chapter 8.100 noise ordinance (Ordinance 4558, adopted April 7, 2026) sets explicit nighttime decibel limits for unincorporated areas: 60 decibels for continuous noise and 75 decibels for intermittent noise, measured from an adjacent residential property line between 10:00 p.m. and 7:00 a.m.
Outdoor and event music in unincorporated Mendocino County falls under the Chapter 8.100 noise ordinance adopted in 2026. Nighttime (10:00 p.m. to 7:00 a.m.) amplified sound is capped at 60 decibels continuous / 75 decibels intermittent at an adjacent residential property, with exemptions for school and public-agency activities.
Vehicle exhaust and engine noise on public roads in unincorporated Mendocino County is governed primarily by California state law, not a special county ordinance. California Vehicle Code 27150 requires an adequate muffler, and Section 27151 prohibits modified exhaust that amplifies noise beyond legal limits.
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