Best Licensed Plumbers in Duarte, CA
12 plumbing companies registered in Duarte 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; 12 registered in Duarte
- 7 of Duarte's 12 licenses (58.3%) carry current workers' compensation cover, not liability insurance; a blank usually means an owner-operator with no employees
- Median time licensed in Duarte: 12 years
- Longest Duarte licensure: since 1986
- 375 county licenses reach their expiration date within 90 days
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- Verified
- August 17, 2026
- Licensed since
- 1986
- Phone
- (626) 357-5288
- Verified
- August 17, 2026
- Licensed since
- 1995
- Phone
- (626) 722-0595
- Verified
- August 17, 2026
- Licensed since
- 2002
- Phone
- (626) 732-4581
- Verified
- August 17, 2026
- Licensed since
- 2011
- Phone
- (626) 831-1575
- Verified
- August 17, 2026
- Licensed since
- 2012
- Phone
- (626) 379-5831
- Verified
- August 17, 2026
- Licensed since
- 2013
- Phone
- (626) 664-8612
- Verified
- August 17, 2026
- Licensed since
- 2024
- Phone
- (626) 361-8237
- Verified
- August 17, 2026
- Licensed since
- 2006
- Phone
- (626) 303-6454
Compare the top 6 at a glance
| Company | License | Workers' comp | Licensed since |
|---|---|---|---|
| Gregory Retzepis DBA Gr Plumbing & Heating | #492976 | On file | 1986 |
| Winegard Energy Inc. | #706874 | On file | 1995 |
| Dun - Well Plumbing & Drains Inc. | #802677 | On file | 2002 |
| Justin Miller Plumbing | #961788 | On file | 2011 |
| Stars Restoration Enterprises Inc. | #969180 | On file | 2012 |
| Ck Plumbing Inc. | #987041 | On file | 2013 |
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, 12 of them registered in Duarte. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median Duarte license has been held 12 years, and the longest-standing one dates to 1986. 7 of Duarte's 12 licenses (58.3%) 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 Duarte: common questions
How many licensed plumbers are there in Duarte?
12 active C-36 plumbing licenses are registered in Duarte, out of 4,272 across Los Angeles County. 12 Duarte-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. 12 active C-36 plumbing licenses are registered in Duarte and 4,272 across Los Angeles County, the longest-standing issued in 1986. 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 7 of Duarte's 12 currently carry. 375 Los Angeles County licenses expire within 90 days.