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.
Solano County does not publish a multi-tiered day/night decibel table in its code; instead it relies on a consistent 65 dBA property-line standard. First, Solano County Code Sec. 21-10 (Disturbing the Peace) defines 'loud or unusual noise' to include any nonagricultural noise after 10:00 p.m. or before 6:00 a.m. that exceeds sixty-five (65) dBA at the property line (Ord. No. 1830). Second, the county zoning ordinance (Chapter 28, Article III) imposes general performance standards requiring all uses of land and structures to be conducted so as to prevent offensive noise, dust, glare, vibration, or odor, including noise that exceeds 65 dBA at any property line. Third, the same article caps outdoor amplified sound at special-events and agritourism uses at 65 dB measured at the property lines. For new development near major roads, railroads, and Travis Air Force Base, the county also applies the noise compatibility criteria in the Health and Safety Element of the Solano County General Plan during environmental review, but those are planning thresholds rather than codified enforceable decibel limits. Measurements in disputes are typically taken at the affected property line.
Exceeding 65 dBA at the property line overnight violates Sec. 21-10 (misdemeanor; up to six months jail and/or $1,000 fine under Sec. 1-21). Exceeding the 65 dBA zoning performance standard makes the use a public nuisance subject to abatement under Chapter 10, with administrative penalties for ordinary violations of $100/$200/$500 (Sec. 10-24). Permitted-event amplified-sound breaches carry event-permit penalties of $150/$700/$2,500.
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