Light Trespass: Fontana vs Rialto
How do light trespass rules compare between Fontana, CA and Rialto, CA?
Fontana has fewer restrictions than Rialto.
Fontana, CA
San Bernardino County
Fontana treats light trespass as a zoning violation under FMC Title 17 and a nuisance under Civil Code 3479. Property-line levels facing residential parcels are capped; neighbors can pursue civil remedies.
View full Fontana rules →Rialto, CA
San Bernardino County
Development Code Chapter 83.07 limits glare onto neighboring property. In the Valley Region, lighting may not exceed 0.5 foot-candle at a residential property line (Section 83.07.030). In the Mountain and Desert Regions, the stricter Light Trespass Ordinance caps trespass at 0.1 foot-candle.
View full Rialto rules →Key Facts Comparison
| Fact | Fontana | Rialto |
|---|---|---|
| City Limit | 0.5 fc at residential line | - |
| Nuisance Law | California Civil Code 3479 | - |
| Shielding | Required (commercial) | Full shielding to preclude trespass |
| Remedy | Citation or injunction | - |
| Enforcement | Code Enforcement + court | - |
| Valley Region limit | - | 0.5 foot-candle at residential property line |
| Mountain & Desert limit | - | 0.1 foot-candle |
| Measurement | - | Photometer at setback line; not during moonlight |
| Code sections | - | 83.07.030 (Valley); 83.07.040 (Mountain/Desert) |
Highlighted rows indicate differences between cities.
Fontana FAQ
How bright can a Fontana commercial site shine onto my home?
Typically no more than 0.5 foot-candles at the shared property line. Measure with an inexpensive light meter and contact Code Enforcement if exceeded.
Can I sue a neighbor over bright security lights?
Yes in extreme cases. Excessive light that substantially interferes with your use of your home is a private nuisance under Civil Code 3479, though courts usually require proof of significant harm.
Rialto FAQ
How much light is my neighbor allowed to cast onto my property?
In the Valley Region, lighting may not cause glare above 0.5 foot-candle at a residential property line (Section 83.07.030). In the Mountain and Desert Regions, the limit is a stricter 0.1 foot-candle under the 2022 Light Trespass Ordinance.
How is light trespass measured?
Section 83.07.030(b) describes a quantitative method using a yardstick placed at the building setback line and a photoelectric photometer following the International Commission on Illumination standard. Measurements are not taken when there is a moon in the night sky.
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