Ontario, CA Building Safety: Fire Sprinkler Requirements (2026)
Key Facts
- Governing section
- OMC § 4-4.62 (CFC 903.3.1.3)
- Standard required
- NFPA 13D, Chapter 80 amendments
- Covers
- 1-2 family homes, R-3, R-4 Cond.1, townhouses
- Local add-on
- Passive purge system for water supply
- Monitoring panel
- Required near main entrance (§ 4-4.63)
- First-offense fine
- Up to $100
Summary
Ontario requires NFPA 13D fire sprinkler systems installed throughout every one- and two-family dwelling, Group R-3, Group R-4 Condition 1 facility, and townhouse built under the current code, per Fire Code Section 4-4.62. The city adds its own twist on the state standard: a passive purge system to protect Ontario's drinking water supply.
Sec. 4-4.62. Amendment: NFPA 13D sprinkler systems.
Section 903.3.1.3 of the CFC is amended to read as follows: 903.3.1.3 NFPA 13D sprinkler systems. NFPA 13D fire sprinkler systems installed in one- and two-family dwellings; Group R-3; Group R-4, Condition 1; and townhouses shall be permitted to be installed throughout in accordance with NFPA 13D as amended in Chapter 80 and to include a passive purge system design to protect the City's drinking water supply. (§ 2, Ord. 3320, eff. February 19, 2026)
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: 2026 S-32: Current through Ordinance 3338, passed 7-21-2026).
Full Breakdown
3, adopted under Ordinance 3320 effective February 19, 2026, to mandate that NFPA 13D fire sprinkler systems be installed throughout one- and two-family dwellings, Group R-3 occupancies, Group R-4 Condition 1 facilities, and townhouses, following NFPA 13D as amended in the Fire Code's Chapter 80. Ontario's local addition beyond the base NFPA 13D standard is the passive purge system design requirement, written into the section specifically to protect the city's drinking water supply from stagnant water in sprinkler piping. 64 requires that once a fire alarm or sprinkler monitoring system is installed, the extinguishing system be monitored through the building's fire alarm control unit in accordance with NFPA 72.
Building and Safety Division plan reviewers check new residential permit sets against these three sections before issuing a permit, and Fire Prevention Division staff inspect the installed system, including the purge design and the monitoring panel placement, before final occupancy sign-off.
Violations & Fines
A sprinkler system that skips the NFPA 13D installation, the passive purge design, or the monitoring requirements is enforced through the same Fire Code penalty structure: an administrative fine under Section 4-4.74 of up to $100 for a first offense, $200 for a second violation of the same provision within a year, and up to $1,000 for a third or later violation. Continuing construction after a stop-work order for a sprinkler deficiency is a separate misdemeanor under Section 4-4.47, with each day of continued work a distinct offense.
Frequently Asked Questions
Does every new house in Ontario need a fire sprinkler system?
What is the passive purge system Ontario adds to the state sprinkler standard?
Do I need a monitoring panel for a home sprinkler system in Ontario?
Sources & Official References
Other rules in Ontario
California rules heatmap·Compare Ontario to another location·View the California building safety overview
See something wrong?
Help us keep this page accurate. If you notice an error or outdated information, let us know.
Fire Sprinkler Requirements in Nearby Cities
How other cities in San Bernardino County handle fire sprinkler requirements.