Ontario sits on the valley floor and is not mapped in a CAL FIRE Very High Fire Hazard Severity Zone. Chapter 7A ignition-resistant construction and PRC 4291 defensible space do not apply citywide.
Under California Public Resources Code 4201 through 4204 and Government Code 51175 through 51189, CAL FIRE maps Fire Hazard Severity Zones for State Responsibility Areas and recommends Local Responsibility Area maps for cities. The City of Ontario, a logistics and industrial hub surrounded by the 10 and 60 freeways and Ontario International Airport, sits at the valley floor with almost no wildland-urban interface, and is therefore not included in any Very High Fire Hazard Severity Zone. This means California Building Code Chapter 7A ignition-resistant construction, the 100-foot defensible space rule under PRC 4291, and additional fire insurance disclosures tied to VHFHSZ parcels do not apply to most Ontario properties. Owners should still comply with weed abatement, safe storage of flammable liquids, and adopted Fire Code provisions. Buyers should verify zone status for any specific parcel through the CAL FIRE Fire Hazard Severity Zone viewer, particularly for properties near hillsides in adjacent cities.
Non-applicable in Ontario for VHFHSZ construction rules, but weed abatement, open burning, and fire code violations are still enforceable with administrative citations starting near 100 dollars.
Ontario, CA
Outdoor music is regulated under OMC Title 5 Chapter 29 and the special-event permit process. Venues and events with amplified sound need a city permit; resi...
Ontario, CA
Aircraft noise from Ontario International Airport (ONT) is regulated by the FAA, not the city. ONT runs an FAA Part 150 noise compatibility program; federal ...
Ontario, CA
Ontario requires a building permit for masonry walls and any fence over 7 feet under the California Building Code. Retaining walls over 4 feet also require p...
Ontario, CA
Ontario fence requirements include zoning-based heights, setbacks, sight triangles, buffer walls on industrial edges, and CBC structural standards. Pool, ret...
Ontario, CA
Ontario limits residential fence heights under the Development Code. Typical maximums are 6 feet rear/side, 3 feet front, and 42 inches in sight-distance tri...
Ontario, CA
Ontario requires dogs to be leashed off-property under OMC Title 6. Maximum leash length is 6 feet, with owner control required in all public spaces except d...
Side-by-side rule comparisons with other cities in San Bernardino County.
See how other cities in San Bernardino County handle wildfire zones.
See how Ontario's wildfire zones rules stack up against other locations.
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