Dark Sky Rules: Pittsburg vs San Ramon

Pittsburg regulates outdoor lighting under Municipal Code Title 18 zoning standards to minimize light pollution and glare. Exterior fixtures must be shielded and directed downward in most zones. Full cutoff fixtures are required for commercial and parking lot lighting. No formal dark-sky ordinance exists, but light trespass onto neighboring properties is prohibited.

San Ramon regulates outdoor lighting through its Development Code (Title D) to reduce light pollution, glare, and spillover onto adjacent properties. Requirements include shielded fixtures, downward-directed light, and limits on lumens and color temperature (typically 3000K or below preferred). The city is not a formal IDA Dark Sky community but incorporates dark-sky principles in design review for new development, especially near open space preserves (Bishop Ranch Regional Preserve, Las Trampas).