10 county-level rules, plus city-specific rules for 3 cities in Solano County, California.
Verified from official government sources
Unincorporated Solano County sets nighttime quiet hours through Solano County Code Sec. 21-10 (Disturbing the Peace). Any non-agricultural noise exceeding 65 dBA at the property line after 10:00 p.m. or before 6:00 a.m. is, by definition, a disturbance of the peace and a misdemeanor. California Penal Code Sec. 415 provides statewide backup authority.
Solano County Planning Commission File PC 17-018 (Feb. 2017, withdrawn)
Public hearing on a proposed ordinance to add Chapter 28.1 (Noise Regulations) to the Solano County Code to regulate noise in the unincorporated area of Solano County... [withdrawn at staff request to allow further public outreach].
Unincorporated Solano County has no dedicated construction-hours ordinance. Construction noise is governed indirectly by Solano County Code Sec. 21-10, which makes any non-agricultural noise exceeding 65 dBA at the property line after 10:00 p.m. or before 6:00 a.m. a per se disturbance of the peace. In practice this confines noisy construction to roughly 6:00 a.m. to 10:00 p.m.
Solano County Code Section 28.83(D)(6) (Ord. 2025-XXXX, adopted Nov. 4, 2025) - applies to BESS only
6. Hours of Construction: Any construction related to a BESS facility shall only occur within the hours of 7:00 a.m. and 6:00 p.m. Monday through Friday.
In unincorporated Solano County, the county's general noise standard in Solano County Code Sec. 21-10 captures barking dogs as 'loud or unusual noise.' The county Animal Services and Sheriff handle barking-dog complaints, and persistent barking that exceeds 65 dBA at the property line overnight, or that maliciously disturbs neighbors at any hour, is enforceable as a disturbance of the peace.
Solano County Code Chapter 4 (Animals and Fowl), Article V - Animal Nuisance
The keeping or harboring of any dog, cat or other animal or fowl, whether licensed or not, which by habitual howling, yelping, barking or other noise disturbs or annoys persons in the neighborhood, is unlawful and is hereby declared to be a public nuisance.
Unincorporated Solano County has no leaf-blower-specific ordinance, no decibel cap, time-of-day limit, or gas-blower ban beyond the general noise rule. Leaf blowers are restricted only via Solano County Code Sec. 21-10: they cannot produce non-agricultural noise above 65 dBA at the property line after 10:00 p.m. or before 6:00 a.m. Statewide, California's gas SORE phase-out limits new gas-blower sales.
Unincorporated Solano County has no standalone amplified-music ordinance. Amplified sound is enforced through Solano County Code Sec. 21-10, where non-agricultural noise above 65 dBA at the property line after 10:00 p.m. or before 6:00 a.m. is a per se disturbance. At permitted special events, wineries, and agritourism, the zoning code (Chapter 28, Art. III) caps outdoor amplified sound at 65 dB at the property lines.
Draft Solano County Code section 28.1-50(c) (Feb. 2017 - withdrawn, never adopted)
(c) Loudspeakers, Amplified Sound. (1) Using or operating for any purpose any loudspeaker, loudspeaker system, or similar device, such that the sound creates a noise disturbance... is prohibited. (2) Special event facilities... provided the maximum noise limit on a receiving property line shall not exceed 70 dB [daytime] and 60 dB [nighttime].
Aircraft noise in unincorporated Solano County, dominated by Travis Air Force Base, is governed by federal and regional rather than county police-power rules. The Solano County Airport Land Use Commission applies the Travis AFB Land Use Compatibility Plan, which uses a 60 dB CNEL noise-contour threshold to restrict new noise-sensitive development; FAA preempts in-flight operations.
Solano County ALUC, established under Cal. Pub. Util. Code section 21670 et seq.; Travis AFB Land Use Compatibility Plan
The commission prepares Airport Land Use Compatibility Plans, reviews city and county general plans and zoning for consistency with Airport Land Use Compatibility Plans... Projects within the Travis Air Force Base area of influence shall be referred to the Solano County Airport Land Use Commission (ALUC) for a determination of consistency.
Industrial and commercial noise in unincorporated Solano County is controlled through the zoning ordinance (Chapter 28, Art. III), which requires all land uses to prevent offensive noise and specifically noise exceeding 65 dBA at any property line. Confined-animal, agricultural-processing, and similar facilities must take adequate measures to control noise so as not to constitute a nuisance. Sec. 21-10 adds an overnight 65 dBA disturbance rule.
Unincorporated Solano County's principal numeric noise limit is 65 dBA at the property line. Solano County Code Sec. 21-10 makes overnight non-agricultural noise above 65 dBA a disturbance of the peace, and the zoning ordinance (Chapter 28, Art. III) requires all land uses to prevent noise exceeding 65 dBA at any property line and caps outdoor amplified event sound at 65 dB.
Outdoor music in unincorporated Solano County is limited by Solano County Code Sec. 21-10 (overnight non-agricultural noise above 65 dBA at the property line is a disturbance of the peace) and, for permitted special events, wineries, and agritourism, by the zoning ordinance (Chapter 28, Art. III), which caps outdoor amplified sound at 65 dB at the property lines and requires events to end by 10:00 p.m.
Vehicle noise in unincorporated Solano County is governed primarily by the California Vehicle Code, which sets statewide muffler and exhaust requirements and decibel limits enforced by CHP and the Sheriff. The county's own Sec. 21-10 disturbance-of-the-peace rule adds local authority over loud non-agricultural noise above 65 dBA at the property line overnight, capturing things like idling or revving in residential areas.
3 cities in Solano County have their own noise ordinances rules. Each link goes to that city's dedicated page with code citations.
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