DC does not have a comprehensive dark-sky ordinance, but outdoor lighting is regulated through the zoning code (11 DCMR), building code, and public space regulations. Light fixtures must be shielded to minimize glare and light trespass onto neighboring properties.
DC's zoning regulations (11 DCMR) require that outdoor lighting for commercial and multi-family properties be designed to minimize light spillover onto adjacent residential properties. The building code requires exterior lighting to comply with energy efficiency standards. DDOT regulates streetlights and lighting in public spaces. New development projects subject to zoning review must demonstrate that exterior lighting plans minimize glare, uplight, and light trespass. LED streetlight conversions have incorporated shielding to reduce upward light scatter. While DC does not have a formal dark-sky ordinance, the National Park Service manages lighting near monuments and memorials to preserve nighttime aesthetics.
Non-compliant lighting may be flagged during zoning or building permit review. Complaints about light trespass can be filed with DOB or through the 311 system. Corrective action may be required.
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See how Washington's dark sky rules rules stack up against other locations.
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