2 county-level rules, plus city-specific rules for 1 city in San Mateo County, California.
Verified from official government sources
Unincorporated San Mateo County has no countywide dark-sky ordinance, but the Development Code's design standards require exterior lighting to be designed and located so that direct light and glare are confined to the site and directed away from neighbors, with low-level, downward-directed lighting encouraged.
Unincorporated San Mateo County's Development Code requires exterior and interior lighting to be designed and located so that direct rays and glare are confined to the premises. The performance standards state no direct or reflected glare shall be visible, though reasonable shielded security lighting is allowed.
1 cities in San Mateo County have their own outdoor lighting rules. Each link goes to that city's dedicated page with code citations.
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