Best Licensed Plumbers in Danville, CA
19 plumbing companies registered in Danville 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.
- 484 active C-36 plumbing licenses in Contra Costa County; 19 registered in Danville
- 12 of Danville's 19 licenses (63.2%) carry current workers' compensation cover, not liability insurance; a blank usually means an owner-operator with no employees
- Median time licensed in Danville: 19 years
- Longest Danville licensure: since 1970
- 37 county licenses reach their expiration date within 90 days
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- Verified
- August 17, 2026
- Licensed since
- 1970
- Phone
- (925) 837-4450
- Verified
- August 17, 2026
- Licensed since
- 1978
- Phone
- (925) 648-9506
- Verified
- August 17, 2026
- Licensed since
- 1983
- Phone
- (510) 522-2442
- Verified
- August 17, 2026
- Licensed since
- 1989
- Phone
- (415) 823-4432
- Verified
- August 17, 2026
- Licensed since
- 2000
- Phone
- (510) 579-7382
- Verified
- August 17, 2026
- Licensed since
- 2007
- Phone
- (925) 382-6764
- Verified
- August 17, 2026
- Licensed since
- 2009
- Phone
- (925) 239-2280
- Verified
- August 17, 2026
- Licensed since
- 2009
- Phone
- (925) 362-9814
Compare the top 6 at a glance
| Company | License | Workers' comp | Licensed since |
|---|---|---|---|
| H C Jensen Plumbing Inc. | #265318 | On file | 1970 |
| Johnson Mechanical LLC | #357683 | On file | 1978 |
| Olsson Plumbing Company | #443706 | On file | 1983 |
| Amores Plumbing Company | #562240 | On file | 1989 |
| S & H Construction Inc. | #786358 | On file | 2000 |
| K M C Design Group Inc. DBA K M C Plumbing Co | #901402 | On file | 2007 |
Contra Costa County plumbing licensure at a glance
California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 484 active C-36 plumbing licenses in Contra Costa County, 19 of them registered in Danville. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median Danville license has been held 19 years, and the longest-standing one dates to 1970. 12 of Danville's 19 licenses (63.2%) 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: 484 of the county's 484 licenses carry the same $25,000 bond California sets by statute. 37 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 Danville: common questions
How many licensed plumbers are there in Danville?
19 active C-36 plumbing licenses are registered in Danville, out of 484 across Contra Costa County. 19 Danville-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. 19 active C-36 plumbing licenses are registered in Danville and 484 across Contra Costa County, the longest-standing issued in 1970. 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 12 of Danville's 19 currently carry. 37 Contra Costa County licenses expire within 90 days.