Ontario, CA Building Safety: Plumbing Permits (2026)

01, with a copy on file at the City Clerk's office for public review. The chapter's ordinance history traces to a 1968 adoption and has been amended repeatedly since, most recently by Ordinance 3321, effective February 2026, keeping the City current with the statewide triennial code cycle. Because the Plumbing Code is adopted wholesale, any water supply, drain-waste-vent, gas piping, or fixture installation the state code classifies as needing a permit needs one issued through Ontario's Building Department before work begins. 01 rather than fixed in the code text, so applicants must check the current fee schedule with the Building Department rather than relying on the code itself.

The Plumbing Code sits alongside the Building, Electrical, Mechanical, and Residential Codes as one of six state codes Ontario adopts under Title 8, all administered through the same permit, fee, and violation framework in Chapter 6, so a single project touching multiple trades, such as a bathroom remodel involving new wiring and repiping, is reviewed against all of the applicable adopted codes at once rather than under separate local plumbing rules.