Best Licensed Plumbers in Sonoma, CA
22 plumbing companies registered in Sonoma 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.
- 332 active C-36 plumbing licenses in Sonoma County; 23 registered in Sonoma
- 12 of Sonoma's 23 licenses (52.2%) carry current workers' compensation cover, not liability insurance; a blank usually means an owner-operator with no employees
- Median time licensed in Sonoma: 13 years
- Longest Sonoma licensure: since 1957
- 21 county licenses reach their expiration date within 90 days
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- Verified
- August 17, 2026
- Licensed since
- 1957
- Phone
- (707) 938-8481
- Verified
- August 17, 2026
- Licensed since
- 1992
- Phone
- (707) 996-8683
- Verified
- August 17, 2026
- Licensed since
- 2002
- Phone
- (707) 938-1121
- Verified
- August 17, 2026
- Licensed since
- 2004
- Phone
- (707) 935-6318
- Verified
- August 17, 2026
- Licensed since
- 2005
- Phone
- (707) 939-8482
- Verified
- August 17, 2026
- Licensed since
- 2008
- Phone
- (707) 938-7611
- Verified
- August 17, 2026
- Licensed since
- 2013
- Phone
- (707) 360-7928
- Verified
- August 17, 2026
- Licensed since
- 2018
- Phone
- (707) 933-7900
Compare the top 6 at a glance
| Company | License | Workers' comp | Licensed since |
|---|---|---|---|
| Peterson Mechanical Inc. | #171486 | On file | 1957 |
| Boden Plumbing Inc. | #659920 | On file | 1992 |
| Eddie R Plumbing | #808283 | On file | 2002 |
| R S Reed Inc. | #844335 | On file | 2004 |
| Bonney Inc. DBA Heatwave Systems | #857673 | On file | 2005 |
| Steven Raffaini Plumbing And Radiant LLC | #916665 | On file | 2008 |
Sonoma County plumbing licensure at a glance
California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 332 active C-36 plumbing licenses in Sonoma County, 23 of them registered in Sonoma. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median Sonoma license has been held 13 years, and the longest-standing one dates to 1957. 12 of Sonoma's 23 licenses (52.2%) 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: 331 of the county's 332 licenses carry the same $25,000 bond California sets by statute. 21 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 Sonoma: common questions
How many licensed plumbers are there in Sonoma?
23 active C-36 plumbing licenses are registered in Sonoma, out of 332 across Sonoma County. 22 Sonoma-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. 23 active C-36 plumbing licenses are registered in Sonoma and 332 across Sonoma County, the longest-standing issued in 1957. 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 Sonoma's 23 currently carry. 21 Sonoma County licenses expire within 90 days.