2 county-level rules, plus city-specific rules for 1 city in Placer County, California.
Verified from official government sources
Placer County's strongest dark-sky standards are in the Tahoe Basin Area Plan, which requires all exterior lighting fixtures to be fully shielded and directed downward so they do not cast obtrusive glare onto adjoining properties or the public right-of-way. Drop-down lenses, mercury-vapor lamps, searchlights and flashing or blinking lights are prohibited, and lighting in trees is banned except during the winter holiday season.
Placer County's policy is to discourage outdoor lighting that shines unnecessarily onto adjacent properties or into the night sky. In the Tahoe Basin, the Area Plan requires all exterior fixtures to be fully shielded and directed downward so they do not cast obtrusive glare onto adjoining properties or the public right-of-way. Elsewhere, light trespass onto neighbors is managed through zoning design standards and conditions of approval.
1 cities in Placer County have their own outdoor lighting rules. Each link goes to that city's dedicated page with code citations.
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