Light Trespass: Ontario vs Rancho Cucamonga
How do light trespass rules compare between Ontario, CA and Rancho Cucamonga, CA?
Ontario and Rancho Cucamonga have similar restriction levels.
Ontario, CA
San Bernardino County
Ontario treats light shining onto neighboring property as a public nuisance under OMC Chapter 30 and zoning Chapter 9, with a typical 0.5 footcandle limit at any residential property line and Code Enforcement response.
View full Ontario rules →Rancho Cucamonga, CA
San Bernardino County
Rancho Cucamonga limits light trespass to 0.5 foot-candles at residential property lines under Development Code 17.58. Complaints can be filed with Planning for fixture retrofits or shielding.
View full Rancho Cucamonga rules →Key Facts Comparison
| Fact | Ontario | Rancho Cucamonga |
|---|---|---|
| Line limit | About 0.5 horizontal fc | - |
| Legal basis | OMC Ch 9 / Ch 30 nuisance | - |
| Contact | Code Enforce (909) 395-2025 | (909) 477-2750 |
| Civil option | Civil Code 3479 | - |
| Residential limit | - | 0.5 foot-candles |
| Commercial limit | - | 1.0 foot-candles |
| Measurement height | - | 5 feet above grade |
| Nuisance law | - | Civil Code 3479 |
Highlighted rows indicate differences between cities.
Ontario FAQ
How do I prove light trespass?
Document with night photos showing the source and spillover, measure with a smartphone light meter at the property line, then file a Code Enforcement complaint.
Can I sue my neighbor for bright lights?
Yes, California Civil Code 3479 allows a private nuisance action for persistent light trespass after other remedies fail.
Rancho Cucamonga FAQ
My neighbor's floodlight shines in my bedroom. What can I do?
File a complaint with Code Enforcement; they will measure spill at the property line and order shielding or aiming changes.
Does motion-activated lighting count as trespass?
Yes, if the activated level exceeds 0.5 foot-candles at the property line; motion triggering does not exempt the fixture.
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