Plumbing contractor (C-36) in Ontario, CA
10 licenses · checked Oct 27, 2026
There are 10 Plumbing contractor (C-36) licenses with an address of record in Ontario, CA, in the CSLB License Master data checked Oct 27, 2026. That is 0.4% of the 2,617 such licenses statewide; Ontario ranks #59 of 514 CA cities for this license type. They are spread across 3 ZIP codes; the most common are 91762 (7), 91764 (2), 91761 (1). Most list San Bernardino County. By business type: Corporation 8, Sole Owner 2. The median first-issue year is 2016; the oldest license dates from 2015. 8 of them come up for renewal or expiration in the next 12 months, so re-check status before you sign a contract.
What a Plumbing contractor (C-36) license covers
Plumbing (C-36) covers systems that supply safe water and remove liquid and water-borne waste, including water heaters, fixtures, gas piping, drain lines and backflow devices.
How to verify a license
Enter the license number in CSLB Instant License Check and confirm the status is active, the classification matches the work, and the contractor has a current bond and workers' compensation coverage (or a valid exemption). California requires the license number on contracts and advertising. Official lookup: CSLB Instant License Check.
Plumbing contractor (C-36) licenses in Ontario
Showing 10 of 10, A to Z. Listing order is alphabetical, not a recommendation.
- A 2 Z Plumbing#1047486 · 91762
- Acosta Pipeline INC#1064810 · 91762
- Baumann Waterworks#1020247 · 91764
- BC7 Construction INC#1049615 · 91764
- High Speed Rooter AND Plumbing INC#1017796 · 91762
- IN AND OUT Plumbing#1030564 · 91761
- JN Construction INC#1001396 · 91762
- Orange Independent Plumbing Services#1005919 · 91762
- PRO Rooter Guys INC#1052306 · 91762
- Ruvico INC#1021363 · 91762
Frequently asked questions
How many Plumbing contractor (C-36) licenses are in Ontario?
10 active licenses in the CSLB License Master data checked Oct 27, 2026 (0.4% of CA).
What does a Plumbing contractor (C-36) license cover?
Plumbing (C-36) covers systems that supply safe water and remove liquid and water-borne waste, including water heaters, fixtures, gas piping, drain lines and backflow devices.
How do I verify a Plumbing contractor (C-36) license in Ontario?
Enter the license number in CSLB Instant License Check and confirm the status is active, the classification matches the work, and the contractor has a current bond and workers' compensation coverage (or a valid exemption). California requires the license number on contracts and advertising. Use the license number shown here with the CSLB Instant License Check.
How many Ontario Plumbing contractor (C-36) licenses expire soon?
8 of 10 have an expiration date in the next 12 months. A license that lapses must be renewed before the holder can work under it again.
Other license types in Ontario
General building contractor (45) · Electrical contractor (C-10) (31) · General engineering contractor (16) · Painting contractor (C-33) (13) · HVAC contractor (C-20) (13) · Low-voltage contractor (C-7) (9) · Landscaping contractor (C-27) (7) · Drywall contractor (C-9) (6) · Tile contractor (C-54) (4) · Cabinet and finish carpentry contractor (C-6) (4) · Flooring contractor (C-15) (3) · Concrete contractor (C-8) (3)
All Plumbing contractor (C-36) licenses in CA →
Source: CSLB License Master. Licensed California is independent and not affiliated with the licensing agency. Data checked Oct 27, 2026.