Walnut Creek, CA Outdoor Lighting: Light Trespass (2026)

Walnut Creek Municipal Code regulates light glare and spillover as part of zoning lighting standards and general nuisance provisions. Outdoor lighting must be designed, installed, and maintained to prevent direct glare and excessive light spillover onto neighboring properties, public rights-of-way, and the night sky. Specific standards include: maximum illumination at residential property lines typically 0.5 foot-candles; prohibition of direct line-of-sight to the lamp source from adjacent residential windows; prohibition of mercury vapor and unshielded high-intensity discharge fixtures; and requirement that floodlights used for security be motion-activated or controlled to avoid continuous operation. For commercial properties, glare from canopy lighting, signage, and parking lots must be controlled through recessed or shielded fixtures. Automotive sales lots have specific lighting standards limiting over-illumination. Sports field and outdoor recreation lighting has separate standards typically requiring shut-off by 10 PM. Violations are handled through Code Enforcement as zoning violations or under Municipal Code nuisance provisions, with orders to abate and potential administrative citations for non-compliance. Persistent violations may be enforced through civil action.