Best Licensed Plumbers in Petaluma, CA
44 plumbing companies registered in Petaluma 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; 45 registered in Petaluma
- 30 of Petaluma's 45 licenses (66.7%) carry current workers' compensation cover, not liability insurance; a blank usually means an owner-operator with no employees
- Median time licensed in Petaluma: 18 years
- Longest Petaluma licensure: since 1963
- 21 county licenses reach their expiration date within 90 days
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- Verified
- August 17, 2026
- Licensed since
- 1963
- Phone
- (707) 579-3511
- Verified
- August 17, 2026
- Licensed since
- 1970
- Phone
- (707) 778-3500
- Verified
- August 17, 2026
- Licensed since
- 1971
- Phone
- (707) 971-7686
- Verified
- August 17, 2026
- Licensed since
- 1977
- Phone
- (415) 847-1990
- Verified
- August 17, 2026
- Licensed since
- 1980
- Phone
- (415) 218-9281
- Verified
- August 17, 2026
- Licensed since
- 1982
- Phone
- (707) 762-1473
- Verified
- August 17, 2026
- Licensed since
- 1985
- Phone
- (707) 765-2600
- Verified
- August 17, 2026
- Licensed since
- 1986
- Phone
- (415) 456-2906
Compare the top 6 at a glance
| Company | License | Workers' comp | Licensed since |
|---|---|---|---|
| Ernest Ongaro & Sons Inc. DBA Ongaro & Sons | #215233 | On file | 1963 |
| Kozy Homes | #262090 | On file | 1970 |
| Bryan Masterson Enterprises | #271933 | On file | 1971 |
| Robert W Von Ahn Plumbing & Electrical Contractor | #334286 | On file | 1977 |
| Paramount Plmg & Htg | #390434 | On file | 1980 |
| Mickelson Enterprises Inc. DBA Jerry And Don's Yager Pump And Well | #424778 | On file | 1982 |
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, 45 of them registered in Petaluma. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median Petaluma license has been held 18 years, and the longest-standing one dates to 1963. 30 of Petaluma's 45 licenses (66.7%) 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 Petaluma: common questions
How many licensed plumbers are there in Petaluma?
45 active C-36 plumbing licenses are registered in Petaluma, out of 332 across Sonoma County. 44 Petaluma-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. 45 active C-36 plumbing licenses are registered in Petaluma and 332 across Sonoma County, the longest-standing issued in 1963. 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 30 of Petaluma's 45 currently carry. 21 Sonoma County licenses expire within 90 days.