Light Trespass: Castro Valley vs Livermore
How do light trespass rules compare between Castro Valley, CA and Livermore, CA?
Castro Valley and Livermore have similar restriction levels.
Castro Valley, CA
Alameda County
Alameda County treats light trespass onto neighbors as nuisance under Title 17 and Civil Code 3479. Residential fixtures cannot exceed 0.5 foot-candles at adjacent property lines.
View full Castro Valley rules →Livermore, CA
Alameda County
Livermore prohibits light trespass onto neighboring residential properties; LMC Title 21 caps illuminance at residential property lines to 0.5 foot-candles.
View full Livermore rules →Key Facts Comparison
| Fact | Castro Valley | Livermore |
|---|---|---|
| Residential limit | 0.5 foot-candles at line | - |
| Commercial limit | 1.0 foot-candle typical | - |
| Nuisance law | Civil Code 3479 | - |
| Required | Shielded, downward-directed | - |
| Motion sensors | 5-10 minute timers OK | - |
| Property Line Cap | - | ~0.5 foot-candles |
| Code | - | LMC Title 21 |
| Correction Window | - | 30-60 days |
| Shielding | - | House-side required |
| Enforcement | - | Code Enforcement |
Highlighted rows indicate differences between cities.
Castro Valley FAQ
My neighbor's security light shines into my bedroom. What can I do?
Ask politely first, then file a code enforcement complaint with Alameda County or your city. Document with photos showing intrusion. Private nuisance suits are also available under Civil Code 3479.
Can I use bright LED security flood lights?
Yes, but they must be shielded to direct light onto your property only and not exceed 0.5 foot-candles at neighbor property lines. Motion-activated fixtures are preferred over always-on lighting.
Livermore FAQ
My neighbor's light shines in my window — what can I do?
File a complaint with Livermore Code Enforcement. They will measure illuminance and order retrofit if above 0.5 fc at your property line.
Can security lights be motion-activated?
Yes — motion-activated lights with short on-cycles are preferred over continuous illumination.
Compare other topics
See how Castro Valley and Livermore compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool