Brush Clearance: Ontario vs Rialto
How do brush clearance rules compare between Ontario, CA and Rialto, CA?
Ontario has fewer restrictions than Rialto.
Ontario, CA
San Bernardino County
Ontario requires owners to keep lots free of dry weeds, brush, and rubbish under the municipal nuisance code and CA H and S 14875. Uncleared parcels are abated by city contractor at owner cost.
View full Ontario rules →Rialto, CA
San Bernardino County
Rialto Municipal Code §15.28.060 (Vacant Lot Clearance) requires owners of vacant lots and improved parcels to clear weeds, brush, rubbish, and combustible vegetation creating a fire hazard. The Rialto Fire Department administers an annual weed abatement program; non-compliant lots are cleared by the city with costs (plus an administrative fee) becoming a lien on the property.
View full Rialto rules →Key Facts Comparison
| Fact | Ontario | Rialto |
|---|---|---|
| State authority | CA H and S 14875-14922 | - |
| Weed height trigger | Typically over 4 to 6 inches | - |
| Abatement fees | Billed to owner plus admin cost | - |
| Enforcement | Code Enforcement 909-395-2025 | Rialto Fire Dept. + Community Compliance (909-820-8070) |
| Fire zone | Ontario not in state VHFHSZ | - |
| Local code | - | Rialto Mun. Code §15.28.060 (Vacant Lot Clearance) |
| WUI defensible space | - | 100 ft. per PRC §4291 (5 / 5-30 / 30-100 zones) |
| Annual program | - | Spring weed abatement notices, ~30-day compliance |
| Forced abatement | - | City contracts cleanup + admin fee + tax lien |
Highlighted rows indicate differences between cities.
Ontario FAQ
Does Ontario require defensible space like foothill cities?
Ontario is on the valley floor and not in a state VHFHSZ, so the 100-foot defensible space rule does not apply, but weed abatement and rubbish removal are still required.
What if my vacant lot is overgrown?
Code Enforcement will mail a notice to abate. If you do not clear it, the city hires a contractor and bills you for the work plus administrative fees.
Rialto FAQ
When do I need to clear my vacant lot?
By the date stated in your annual weed-abatement notice from Rialto Fire (typically late spring before fire season). Vegetation must be cut to 3 inches or less and combustible debris removed.
What happens if I don't clear my lot?
The city will contract a crew to clear it at your expense, adding administrative overhead (often 25–40%) and recording a lien on your property under Gov. Code §39574.
Does PRC 4291 apply to my Rialto home?
Only if your structure is in or adjacent to a State Responsibility Area or Very High Fire Hazard Severity Zone (mainly the northern foothill / Cajon Pass overlay). Most Rialto residential parcels follow Mun. Code §15.28.060 instead.
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