Wildfire Zones: Rialto vs San Bernardino
How do wildfire zones rules compare between Rialto, CA and San Bernardino, CA?
Rialto has fewer restrictions than San Bernardino.
Rialto, CA
San Bernardino County
Most of Rialto is in a Local Responsibility Area (LRA) Moderate / Non-VHFHSZ classification, but the northern foothill / Cajon Pass overlay touches CAL FIRE State Responsibility Area (SRA) Very High Fire Hazard Severity Zones (VHFHSZ). Properties within these zones face Cal. Public Resources Code §4291 100-ft. defensible space, Cal. Government Code §51182 vegetation requirements, and Cal. Building Code Chapter 7A WUI construction standards.
View full Rialto rules →San Bernardino, CA
San Bernardino County
The northern San Bernardino foothills are mapped by CAL FIRE as Very High Fire Hazard Severity Zones. VHFHSZ parcels must meet PRC 4291 defensible space and Chapter 7A wildfire construction rules.
View full San Bernardino rules →Key Facts Comparison
| Fact | Rialto | San Bernardino |
|---|---|---|
| Most of city | LRA Moderate / unzoned | - |
| Northern foothill / Cajon Pass | SRA Very High Fire Hazard Severity Zone | - |
| Defensible space | 100 ft. (PRC §4291 / Gov. Code §51182) in VHFHSZ | - |
| New construction in WUI | Cal. Building Code Ch. 7A required | - |
| AB 38 sale disclosure | Required for VHFHSZ properties | - |
| Legal framework | - | CA PRC 4202 and Gov Code 51178 FHSZ mapping |
| Primary zone | - | VHFHSZ covers northern foothills and Waterman Canyon areas |
| Construction rules | - | CBC Chapter 7A ignition-resistant materials required |
| Seller disclosure | - | Civil Code 1103 VHFHSZ disclosure mandatory at sale |
| Insurance impact | - | VHFHSZ mapping drives carrier non-renewals and FAIR Plan use |
Highlighted rows indicate differences between cities.
Rialto FAQ
How do I know if my Rialto property is in a wildfire zone?
Check the official CAL FIRE FHSZ Viewer (osfm.fire.ca.gov/fhsz). Most Rialto urban parcels are LRA Moderate; only northern/foothill parcels near Lytle Creek and the Cajon Pass are SRA VHFHSZ.
What do I have to do if I'm in a VHFHSZ?
Maintain 100 ft. defensible space per PRC §4291, comply with Ch. 7A construction standards for new builds/remodels, and disclose the zone at any sale per AB 38.
Does Rialto Fire inspect for defensible space?
Yes — Rialto Fire conducts annual weed-abatement inspections of all parcels under Mun. Code §15.28.060; CAL FIRE separately inspects SRA parcels for PRC §4291 compliance.
San Bernardino FAQ
How do I know if my San Bernardino property is in a VHFHSZ?
Use the OSFM Fire Hazard Severity Zone viewer or contact City of San Bernardino Community Development at (909) 384-5122 for a parcel-specific map.
What construction rules apply in a VHFHSZ?
New builds and substantial remodels must meet CBC Chapter 7A, including Class A roofs, ember-resistant vents, and ignition-resistant siding and eaves.
Must I disclose VHFHSZ status when selling my home?
Yes. California Civil Code 1103 requires a natural hazards disclosure showing VHFHSZ status and buyer responsibility for defensible space.
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