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Licensed Plumbers in Ontario, California

Updated November 1, 2026 from CSLB's public license file · C-36 Plumbing Contractor

  • 49licensed plumbers
  • 49active (Clear)
  • 0%with a suspension
  • 46.9%workers' comp exempt
  • 11.3 yrsmedian time licensed
  • 59.2%corp / LLC / partnership (40.8% sole owner)
  • 2new in the last 12 months
  • —change tracking began November 1, 2026

Ontario is home to 49 plumbers in CSLB's license file, ranking #4 of 14 San Bernardino County cities for this trade. 100% are Clear.

46.9% report a workers' comp exemption, 4.3 points lower than the statewide figure for plumbers (51.2%), so many of these businesses say they have no employees. The share with a suspension, 0%, is 4.4 points lower than the San Bernardino County rate for the same license (4.4%).

The median plumber here has held a license for 11.3 years (less than the statewide median of 13.4), and 2 licenses were issued in the last 12 months.

In California this work generally calls for the C-36 Plumbing Contractor license (or a B license when it is part of a larger multi-trade job). See the C-36 Plumbing Contractor guide for what the license covers.

How to check a plumber's license in Ontario

  1. Find the business in the list below, or search all 49 Ontario listings, and open its profile. You want a Clear status and the C-36 classification (a B license can also cover it as part of a multi-trade job).
  2. Re-check the same number on CSLB's Instant License Check the day you sign; our copy is refreshed weekly and 0% of Ontario listings here already show a suspension.
  3. Match the license holder's name to the name on the written contract and the person you meet. Ask for proof of workers' comp if anyone besides the owner will work on site. Hiring checklist.

All 49 plumbers in Ontario

Ontario plumbers sorted with Clear licenses first, then by years licensed. Badges reflect CSLB's file dated November 1, 2026, not a rating of anyone's work.

Licensed plumbers in Ontario
Business nameLicense #StatusYearsWorkers' compBond
Spec Construction CO INC 419626 Clear 44 Insured On file
G & G Plumbing 508994 Clear 39 Exempt On file
P V & C Plumbing and Piping INC 529259 Clear 38 Insured On file
Inter-City Energy Systems INC 587709 Clear 36 Insured On file
E A Plumbing INC 603170 Clear 36 Insured On file
Fairchild Plumbing & Mechanical INC 606705 Clear 35 Insured On file
Gorder D M G Construction CO 632348 Clear 34 Exempt On file
Yoo Ho Soo 703553 Clear 31 Exempt On file
G & S Reasonable Plumbing / All Tech 764181 Clear 27 Insured On file
Reed's Plumbing 788531 Clear 25 Exempt On file
Grace Rooter and Plumbing 817808 Clear 23 Exempt On file
Sweet Water Landscaping 817917 Clear 23 Exempt On file
American Jetting Services INC 845651 Clear 22 Insured On file
West Coast Plumbing 853144 Clear 21 Exempt On file
Flow Dynamics INC 858166 Clear 21 Insured On file
Kao Brian Yawching 897876 Clear 19 Insured On file
Pro Tech Plumbing 915091 Clear 18 Exempt On file
Specialist Plumbing the 915935 Clear 18 Insured On file
Water Solutions 954619 Clear 16 Exempt On file
Safford Plumbing 968088 Clear 14 Exempt On file
Alpha Omega Plumbing 977823 Clear 14 Exempt On file
Clearwater Plumbing & Construction 980596 Clear 13 Exempt On file
Palacios Jose Luis 986197 Clear 13 Insured On file
Jn Construction INC 1001396 Clear 11 Insured On file
Orange Independent Plumbing Services 1005919 Clear 11 Insured On file
High Speed Rooter and Plumbing INC 1017796 Clear 10 Insured On file
Baumann Waterworks 1020247 Clear 10 Exempt On file
Ruvico INC 1021363 Clear 9 Insured On file
In and Out Plumbing 1030564 Clear 9 Exempt On file
A 2 Z Plumbing 1047486 Clear 7 Exempt On file
Bc7 Construction INC 1049615 Clear 7 Insured On file
Pro Rooter Guys INC 1052306 Clear 7 Exempt On file
C 2 C Plumbing INC 1058502 Clear 7 Insured On file
Acosta Pipeline INC 1064810 Clear 6 Insured On file
Simple Restoration INC 1066954 Clear 6 Insured On file
Jnsd Construction INC 1080741 Clear 5 Exempt On file
J M E Plumbing INC 1083921 Clear 4 Insured On file
All Pro Cooling Heating Plumbing & Electrical 1103983 Clear 3 Insured On file
Elias Plumbing 1105933 Clear 3 Insured On file
Royalty Plumbing INC 1109464 Clear 3 Insured On file
Sm Waterworks Backflow Service 1115619 Clear 2 Exempt On file
West Coast Pipeline Specialist 1129511 Clear 1 Insured On file
Pisces Plumbing 1133446 Clear 1 Insured On file
Dylan's Plumbing Group INC 1136831 Clear 1 Exempt On file
Vargos Plumbing & Sewer INC 1138500 Clear 1 Exempt On file
Sts Plumbing & Rooter INC 1140510 Clear 1 Exempt On file
Nelissen Plumbing 1142166 Clear 1 Exempt On file
Lvl Up Plumbing INC 1146179 Clear 1 Exempt On file
Showtime Family Plumbing & Rooter INC 1151703 Clear <1 Insured On file

Source: CSLB public data · Updated November 1, 2026 Status can change at any time. Verify on CSLB's Instant License Check.

Frequently asked questions

How many licensed plumbers are in Ontario?

CSLB's current public file lists 49 plumbers with a Ontario mailing address. 49 have a Clear status, and 83.7% show no issues at all in the file (no suspension, no pending action, bond on file, not near expiration).

What license does a plumber need in California?

In California this work generally calls for the C-36 Plumbing Contractor license (or a B license when it is part of a larger multi-trade job). Any job of $1,000 or more in labor and materials needs a licensed contractor. Read our guide to the $1,000 rule.

How do I check a plumber's workers' comp?

Each profile shows the workers' comp type, insurer and policy dates from CSLB's file. Among Ontario plumbers, 46.9% are exempt (no employees), 53.1% insured and 0% without current coverage. Verify a policy with CSLB's insurer search (step by step).

Related

Plumbers in nearby cities

More plumbers lists in San Bernardino County

Other licensed trades in Ontario

Guides