Defensible Space: Ontario vs Rialto
How do defensible space rules compare between Ontario, CA and Rialto, CA?
Ontario and Rialto have similar restriction levels.
Ontario, CA
San Bernardino County
Properties in San Bernardino Mountain WUI zones must clear 100 feet of defensible space around structures. SBCFPD inspects annually before fire season; failure to comply triggers abatement orders, contractor cleanup at owner cost, and potential criminal citations.
View full Ontario rules →Rialto, CA
San Bernardino County
Properties in San Bernardino Mountain WUI zones must clear 100 feet of defensible space around structures. SBCFPD inspects annually before fire season; failure to comply triggers abatement orders, contractor cleanup at owner cost, and potential criminal citations.
View full Rialto rules →Key Facts Comparison
| Fact | Ontario | Rialto |
|---|---|---|
| Clearance distance | 100 feet from structures | 100 feet from structures |
| Inspection authority | SBCFPD fire marshal | SBCFPD fire marshal |
| State law | PRC section 4291 | PRC section 4291 |
| Lien | Costs added to taxes | Costs added to taxes |
Highlighted rows indicate differences between cities.
Ontario FAQ
Does defensible space apply to desert lots?
Yes for parcels inside State Responsibility Areas, but creosote and Joshua trees should not be removed; thinning rather than clearing is preferred to protect desert ecology and meet PRC 4291.
Who inspects mountain properties?
SBCFPD fire prevention officers conduct annual pre-season inspections, often coordinated with CAL FIRE in mountain communities and contract cities under the SBCFPD service area.
Rialto FAQ
Does defensible space apply to desert lots?
Yes for parcels inside State Responsibility Areas, but creosote and Joshua trees should not be removed; thinning rather than clearing is preferred to protect desert ecology and meet PRC 4291.
Who inspects mountain properties?
SBCFPD fire prevention officers conduct annual pre-season inspections, often coordinated with CAL FIRE in mountain communities and contract cities under the SBCFPD service area.
Compare other topics
See how Ontario and Rialto compare on other ordinance categories.
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