Ontario's Fire Regulations: The Rules That Matter

Every city handles fire regulations a little differently. In Ontario, California, there are 6 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.

Propane Storage

Ontario bans bulk liquefied petroleum gas storage in every zoning district except the General Industrial District under Fire Code Section 4-4.73, and even there a storage installation needs the Fire Chief's specific approval before it can open. The rule implements Section 6104.2 of the 2025 California Fire Code and is aimed at keeping large LP-gas storage out of the city's populated neighborhoods.

Key details: Governing section: OMC § 4-4.73. Where allowed: General Industrial District only. Extra requirement: Specific Fire Chief approval. Adopts: 2025 CFC § 6104.2. First-offense fine: Up to $100.

Violating the Section 4-4.73 storage limits is charged under the Fire Code's administrative fine schedule at OMC Section 4-4.74: up to $100 for a first offense, up to $200 for a second violation of the same provision within one year, and up to $1,000 for a third or later violation in that period. Fire officials can also pursue an infraction or misdemeanor under Section 4-4.46, with each day the unauthorized storage continues counted as a separate offense.

This is one of the stricter rules in Ontario's municipal code. If you are unsure whether your situation complies, it is worth checking with the city before proceeding.

Wildfire Zones

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.

Key details: CAL FIRE status: Not in VHFHSZ. Chapter 7A: Not required citywide. PRC 4291: Defensible space rule not triggered. Still required: Weed abatement and Fire Code. Map check: CAL FIRE FHSZ viewer.

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.

Smoke Detectors

Ontario enforces California H and S 13113.7 requiring smoke alarms in every bedroom, outside sleeping areas, and on every floor. 10-year sealed-battery or hardwired units are required on replacement.

Key details: State authority: CA H and S 13113.7. Required locations: Each bedroom, hallway, every floor. Alarm type: 10-year sealed or hardwired backup. Rental rule: Test before each new tenancy. Retrofit trigger: Work over 1,000 dollars.

Code Enforcement and Ontario Fire can cite owners or landlords for missing or disabled smoke alarms. Fines start near 100 dollars and rental units may be red-tagged as substandard housing until corrected.

Fireworks

All fireworks - including state-approved 'safe and sane' fireworks sold in some neighboring cities - are illegal to use, possess, store, or sell anywhere in the City of Ontario. Possession and discharge are prohibited unless a permit is issued by the California State Fire Marshal and approved by the Ontario Fire Department, which is granted only to state-licensed pyrotechnicians.

Key details: Local rule: All fireworks (including safe-and-sane) banned citywide. Fine: $1,000 per violation. Code Section: Ontario Municipal Code Ch. 21; Cal. Health & Safety Code section 12677. Permit: State Fire Marshal permit + Ontario Fire Dept approval (licensed pyrotechnicians only).

Violations are declared a public nuisance and carry a $1,000 fine, in addition to any other civil penalty, criminal prosecution, or fine. Fireworks found in a person's possession are confiscated and destroyed. Under California Health and Safety Code section 12677, possessing dangerous fireworks without a permit is a misdemeanor.

This is not one of those rules that cities tend to ignore. Ontario actively enforces its fireworks requirements.

Fire Pits & Backyard Fires

Backyard fire pits, fire rings, chimineas, and barbecues are allowed in Ontario but must follow the 2022 California Fire Code. Barbecue/BBQ pits outside of buildings must be at least 15 feet from a structure, recreational fire pits must keep a 25-foot clearance from structures and combustibles, and the fire must be attended with extinguishing equipment available. Portable outdoor fireplaces and gas fire pits are the lower-smoke alternative.

Key details: BBQ pit setback: 15 ft from a structure (CFC 307.4). Recreational fire pit setback: 25 ft from structures/combustibles (CFC 307.4.2). Max fire size: 3 ft diameter x 2 ft high. Code Section: 2022 California Fire Code Section 307.

Fire pits that violate Fire Code clearances or attendance rules can be ordered immediately extinguished by the Ontario Fire Department, and the violation is enforceable under the adopted California Fire Code (Chapter 1), with possible cost recovery for any fire response.

Outdoor Burning

Open burning to dispose of residential waste, leaves, brush, or trash is prohibited in Ontario. The city is in the South Coast Air Quality Management District, whose Rule 444 (Open Burning) expressly prohibits residential burning, and the Ontario Fire Prevention Bureau enforces the 2022 California Fire Code open-burning rules.

Key details: Air district: South Coast AQMD (SCAQMD). Code Section: SCAQMD Rule 444(d)(3)(A); 2022 CFC Section 307. Residential burning: Prohibited. Adopted code: 2022 California Fire Code via Ontario Municipal Code.

Residential open burning is a violation of SCAQMD Rule 444 and the adopted California Fire Code, subject to SCAQMD enforcement and administrative penalties, plus potential California Fire Code citations and fire-department cost recovery for any response. The fire code official is authorized to order extinguishment of any non-compliant open burning.

This is not one of those rules that cities tend to ignore. Ontario actively enforces its outdoor burning requirements.

The Bottom Line

Ontario is tougher than many cities when it comes to fire regulations. Out of the 6 rules covered here, 3 are rated strict. If you are a homeowner, renter, or business owner in Ontario, take the time to understand these requirements before they become a problem. Most violations come with fines, and some repeat violations can escalate.

These rules come from Ontario's publicly available municipal code. For complete penalty schedules, exemption details, and answers to common questions, see the individual ordinance pages throughout this guide.