2 county-level rules, plus city-specific rules for 1 city in Tuolumne County, California.
Verified from official government sources
Tuolumne County has no stand-alone dark-sky ordinance, but its Title 17 Objective Site and Design Standards require exterior lighting to be recessed or hooded, downward-directed, and confined to the intended area. Exposed bulbs and colored bulbs or lenses are prohibited, uplighting is prohibited in covered projects, and common-area fixtures must be fully shielded to at least 30 degrees below horizontal.
Tuolumne County's Title 17 Objective Site and Design Standards address light trespass directly: lighting shall not spill beyond the intended area and must be directed away from adjacent structures to minimize spill. Lighting of outdoor service, loading, and storage areas must not be visible from the street or adjacent properties, and common-area lighting must not shine directly onto adjacent residentially zoned land.
1 cities in Tuolumne County have their own outdoor lighting rules. Each link goes to that city's dedicated page with code citations.
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