Best Licensed Plumbers in Walnut, CA
15 plumbing companies registered in Walnut hold current CSLB licenses, verified against official records as of August 17, 2026. The 8 below are the top-ranked, ordered by workers' compensation cover and years licensed.
- 4,272 active C-36 plumbing licenses in Los Angeles County; 15 registered in Walnut
- 9 of Walnut's 15 licenses (60.0%) carry current workers' compensation cover, not liability insurance; a blank usually means an owner-operator with no employees
- Median time licensed in Walnut: 11 years
- Longest Walnut licensure: since 1966
- 375 county licenses reach their expiration date within 90 days
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- Verified
- August 17, 2026
- Licensed since
- 1966
- Phone
- (909) 978-0400
- Verified
- August 17, 2026
- Licensed since
- 1988
- Phone
- (626) 523-4803
- Verified
- August 17, 2026
- Licensed since
- 1999
- Phone
- (626) 839-8082
- Verified
- August 17, 2026
- Licensed since
- 2002
- Phone
- (626) 332-9984
5.Mtec
- Verified
- August 17, 2026
- Licensed since
- 2006
- Phone
- (213) 820-1020
- Verified
- August 17, 2026
- Licensed since
- 2015
- Phone
- (909) 762-0153
- Verified
- August 17, 2026
- Licensed since
- 2016
- Phone
- (909) 326-6101
- Verified
- August 17, 2026
- Licensed since
- 2018
- Phone
- (909) 568-8607
Compare the top 6 at a glance
| Company | License | Workers' comp | Licensed since |
|---|---|---|---|
| United Riggers & Erectors Inc. | #245451 | On file | 1966 |
| G Phillips Plumbing | #526195 | On file | 1988 |
| La Habra Fire Protection And Plumbing | #757985 | On file | 1999 |
| A Drain Doctor | #803591 | On file | 2002 |
| Mtec | #873492 | On file | 2006 |
| Maximus Builders Inc. | #1000594 | On file | 2015 |
Los Angeles County plumbing licensure at a glance
California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 4,272 active C-36 plumbing licenses in Los Angeles County, 15 of them registered in Walnut. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median Walnut license has been held 11 years, and the longest-standing one dates to 1966. 9 of Walnut's 15 licenses (60.0%) carry current workers' compensation cover in CSLB's file. That is employee injury cover, not liability insurance, and a blank usually means an owner-operator with no employees - lawful, and not a mark against anyone. The contractor bond is not a signal here: 4,270 of the county's 4,272 licenses carry the same $25,000 bond California sets by statute. 375 county licenses reach their expiration date within the next 90 days. CSLB cannot link straight to a license record, so every listing above shows its number for you to type into CSLB's license lookup. How we verify.
Plumbers in Walnut: common questions
How many licensed plumbers are there in Walnut?
15 active C-36 plumbing licenses are registered in Walnut, out of 4,272 across Los Angeles County. 15 Walnut-registered companies passed our license verification, and the 8 on this page are the top-ranked of those. Only licenses CSLB shows as CLEAR and unexpired are listed.
Does California license plumbers?
Yes. California licenses contractors by classification, and C-36 is the CSLB classification that authorises this work. 15 active C-36 plumbing licenses are registered in Walnut and 4,272 across Los Angeles County, the longest-standing issued in 1966. Only CLEAR, unexpired licenses appear here.
How do I check a plumber's license in California?
Every listing above shows its CSLB license number. CSLB cannot link straight to a record, so open its license lookup and type the number in: it shows status, expiration, the contractor bond and workers' compensation cover, which 9 of Walnut's 15 currently carry. 375 Los Angeles County licenses expire within 90 days.