Best Licensed Plumbers in Foster City, CA
13 plumbing companies registered in Foster City 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.
- 426 active C-36 plumbing licenses in San Mateo County; 13 registered in Foster City
- 6 of Foster City's 13 licenses (46.2%) carry current workers' compensation cover, not liability insurance; a blank usually means an owner-operator with no employees
- Median time licensed in Foster City: 8 years
- Longest Foster City licensure: since 1985
- 35 county licenses reach their expiration date within 90 days
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- Verified
- August 17, 2026
- Licensed since
- 1985
- Phone
- (415) 806-2788
- Verified
- August 17, 2026
- Licensed since
- 1997
- Phone
- (650) 570-5070
- Verified
- August 17, 2026
- Licensed since
- 2001
- Phone
- (650) 372-9456
- Verified
- August 17, 2026
- Licensed since
- 2005
- Phone
- (650) 218-6100
- Verified
- August 17, 2026
- Licensed since
- 2007
- Phone
- (415) 642-8088
- Verified
- August 17, 2026
- Licensed since
- 2025
- Phone
- (408) 510-4218
- Verified
- August 17, 2026
- Licensed since
- 2006
- Phone
- (530) 523-6001
- Verified
- August 17, 2026
- Licensed since
- 2018
- Phone
- (650) 773-2914
Compare the top 6 at a glance
| Company | License | Workers' comp | Licensed since |
|---|---|---|---|
| Star Plumbing & Fire Construction Co | #482561 | On file | 1985 |
| Water Heater Specialists | #741904 | On file | 1997 |
| Dinelli Plumbing Incorporated | #801472 | On file | 2001 |
| Mcmahon Plumbing Inc. | #865206 | On file | 2005 |
| Magnum Construction Group Inc. | #901895 | On file | 2007 |
| Line Up Group Inc. | #1144936 | On file | 2025 |
San Mateo County plumbing licensure at a glance
California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 426 active C-36 plumbing licenses in San Mateo County, 13 of them registered in Foster City. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median Foster City license has been held 8 years, and the longest-standing one dates to 1985. 6 of Foster City's 13 licenses (46.2%) 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: 426 of the county's 426 licenses carry the same $25,000 bond California sets by statute. 35 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 Foster City: common questions
How many licensed plumbers are there in Foster City?
13 active C-36 plumbing licenses are registered in Foster City, out of 426 across San Mateo County. 13 Foster City-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. 13 active C-36 plumbing licenses are registered in Foster City and 426 across San Mateo County, the longest-standing issued in 1985. 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 6 of Foster City's 13 currently carry. 35 San Mateo County licenses expire within 90 days.