2 county-level rules, plus city-specific rules for 1 city in Sonoma County, California.
Verified from official government sources
Unincorporated Sonoma County has no single countywide dark-sky ordinance for all properties, but its Zoning Regulations (Chapter 26) require fully shielded, downward-cast lighting for many uses. For example, ADU and certain special-use standards require fully shielded, downward-facing fixtures and prohibit floodlights and uplights.
Sonoma County's Zoning Regulations (Chapter 26) address light spillover onto neighboring properties through use-specific standards and design review rather than a single trespass ordinance. Regulated uses must use fully shielded, downward-cast lighting so it does not wash onto other properties, and certain uses cap illuminance at the property line.
1 cities in Sonoma County have their own outdoor lighting rules. Each link goes to that city's dedicated page with code citations.
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