Light trespass across property lines in Mountain View is limited to 0.5 foot-candles in residential areas. Persistent light pollution causing nuisance can be reported to Code Enforcement for abatement.
Mountain View regulates light trespass under the Zoning Ordinance and general nuisance provisions. Exterior lighting must not cast more than 0.5 foot-candles (measured at 5 feet above ground) onto adjacent residential properties. Commercial and industrial lighting is subject to the same residential-protection limit when adjoining residential zones. Security lighting should use motion sensors, shorter on-cycles, and warm-color LEDs under 3000K to reduce glare and circadian impact. Complaints are investigated by Code Enforcement, which may require fixture replacement, shielding, aiming adjustments, or timers. Civil remedies under California nuisance law (Civil Code 3479) are also available when lighting substantially interferes with the use and enjoyment of property. Sports field lighting at Shoreline and school facilities follows specific operational hours.
Contact your local code enforcement office for specific penalty information.
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Side-by-side rule comparisons with other cities in Santa Clara County.
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