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Licensed Plumbers in Walnut, California

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

  • 20licensed plumbers
  • 19active (Clear)
  • 5%with a suspension
  • 55%workers' comp exempt
  • 13.8 yrsmedian time licensed
  • 35%corp / LLC / partnership (65% sole owner)
  • 0new in the last 12 months
  • —change tracking began November 1, 2026

CSLB's public data lists 20 plumbers with a mailing address in Walnut, and 19 of them (95%) show a Clear primary status.

The share with a suspension (5%) is close to the Los Angeles County rate for the same license (4.6%). 55% report a workers' comp exemption, 3.8 points higher than the statewide figure for plumbers (51.2%), so many of these businesses say they have no employees.

0 of these licenses are less than a year old, while 70% have been held for 10 years or more. The median is 13.8 years.

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 Walnut

  1. Look the company up by name or license number (search Walnut). On the profile, confirm three things: Clear status, the C-36 license for this kind of work, and a contractor's bond on file.
  2. Re-check the same number on CSLB's Instant License Check the day you sign; our copy is refreshed weekly and 5% of Walnut 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. Since 55% of Walnut plumbers claim a workers' comp exemption, ask who will actually do the work. Hiring checklist.

All 20 plumbers in Walnut

Walnut 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 Walnut
Business nameLicense #StatusYearsWorkers' compBond
United Riggers & Erectors INC 245451 Clear 60 Insured On file
Phillips G Plumbing 526195 Clear 38 Insured On file
John the Plumber 669082 Clear 33 Exempt On file
Hwang Dong Tsair 697328 Clear 32 Exempt On file
La Habra Fire Protection and Plumbing 757985 Clear 27 Insured On file
A Drain Doctor 803591 Clear 24 Insured On file
Mtec 873492 Clear 20 Insured On file
Bruce's Plumbing Service 904642 Clear 19 Exempt On file
Joellson Michael 957335 Clear 15 Exempt On file
Maximus Builders INC 1000594 Clear 11 Insured On file
Bonilla Christopher 1002675 Clear 11 Exempt On file
Walnut Plumbing 1005582 Clear 11 Exempt On file
Pomona Valley Plumbing Heating Air Conditioning CO INC 1019549 Clear 10 Insured On file
Kp Plumbing INC 1044093 Clear 8 Insured On file
Maximum Mechanical Plumbing 1051536 Clear 7 Exempt On file
Chien Scott 1089712 Clear 4 Exempt On file
Li David 1111958 Clear 3 Exempt On file
Expert HVAC Service INC 1115612 Clear 2 Insured On file
Peacecal Plumbing 1144632 Clear 1 Exempt On file
Select Plumbing 816005 Susp: contractor's bond 23 Exempt 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 Walnut?

CSLB's current public file lists 20 plumbers with a Walnut mailing address. 19 have a Clear status, and 85% 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?

CSLB issues the C-36 Plumbing Contractor classification for this work. In Los Angeles County, 95% of Walnut's holders are Clear right now. The license requirement starts at $1,000 per job (the minor-work rule).

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

Open the contractor's profile here to see the workers' comp type and insurer from CSLB's file. In Walnut, 45% of plumbers list a policy, 55% claim an exemption and 0% show no current coverage. Confirm the policy with CSLB's workers' comp search before work starts. How to check workers' comp.

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