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Licensed Plumbers in Sonoma, California

Updated November 1, 2026 from CSLB's public license file · C-36 Plumbing Contractor

  • 25licensed plumbers
  • 25active (Clear)
  • 0%with a suspension
  • 48%workers' comp exempt
  • 13.6 yrsmedian time licensed
  • 84%corp / LLC / partnership (16% sole owner)
  • 4new in the last 12 months
  • —change tracking began November 1, 2026

There are 25 plumbers based in Sonoma in CSLB's current file. 25 (100%) have a Clear status as of November 1, 2026.

The share with a suspension, 0%, is 4.7 points lower than the Sonoma County rate for the same license (4.7%). 48% report a workers' comp exemption, 3.2 points lower than the statewide figure for plumbers (51.2%), so many of these businesses say they have no employees.

The median plumber here has held a license for 13.6 years (more than the statewide median of 13.4), and 4 licenses were issued in the last 12 months.

In California this work generally calls for the C-36 Plumbing Contractor license (or a B license when it is part of a larger multi-trade job). See the C-36 Plumbing Contractor guide for what the license covers.

How to check a plumber's license in Sonoma

  1. Look the company up by name or license number (search Sonoma). On the profile, confirm three things: Clear status, the C-36 license for this kind of work, and a contractor's bond on file.
  2. Re-check the same number on CSLB's Instant License Check the day you sign; our copy is refreshed weekly and 0% of Sonoma listings here already show a suspension.
  3. Match the license holder's name to the name on the written contract and the person you meet. Ask for proof of workers' comp if anyone besides the owner will work on site. Hiring checklist.

All 25 plumbers in Sonoma

Sonoma plumbers sorted with Clear licenses first, then by years licensed. Badges reflect CSLB's file dated November 1, 2026, not a rating of anyone's work.

Licensed plumbers in Sonoma
Business nameLicense #StatusYearsWorkers' compBond
Peterson Mechanical INC 171486 Clear 69 Insured On file
American Builders 427930 Clear 44 Exempt On file
Ferrando's Plumbing & Heating INC 449417 Clear 43 Exempt On file
Boden Plumbing INC 659920 Clear 33 Insured On file
Eddie R Plumbing 808283 Clear 24 Insured On file
R S Reed INC 844335 Clear 22 Insured On file
Heatwave Systems 857673 Clear 21 Insured On file
Haddly Plumbing 869145 Clear 20 Exempt On file
Raffaini Steven Plumbing and Radiant LLC 916665 Clear 18 Insured On file
Sandeen Plumbing LLC 941868 Clear 16 Exempt On file
Cottam Enterprises INC 973502 Clear 14 Exempt On file
Precision Northbay INC 976759 Clear 14 Exempt On file
Gopher - It Trenchless 982140 Clear 13 Insured On file
Valley of the Moon Plumbing LLC 1004026 Clear 11 Insured On file
Wine Country Fire Protection & Plumbing INC 1038646 Clear 8 Insured On file
McMahon Fernandez Construction INC 1055940 Clear 7 Insured On file
Easton Plumbing INC 1059513 Clear 7 Insured On file
Healing Comfort Heating Air & Plumbing 1075338 Clear 5 Insured On file
Spotless Plumbing 1093556 Clear 4 Insured On file
Plumb Smart 1126758 Clear 2 Exempt On file
Locati Plumbing 1139128 Clear 1 Exempt On file
Big Al's Plumbing 1149646 Clear <1 Exempt On file
Goflow Plumbing INC 1150830 Clear <1 Exempt On file
Keep It Real Plumbing 1158587 Clear <1 Exempt On file
Vine Valley Plumbing LLC 1159843 Clear <1 Exempt On file

Source: CSLB public data · Updated November 1, 2026 Status can change at any time. Verify on CSLB's Instant License Check.

Frequently asked questions

How many licensed plumbers are in Sonoma?

CSLB's current public file lists 25 plumbers with a Sonoma mailing address. 25 have a Clear status, and 100% show no issues at all in the file (no suspension, no pending action, bond on file, not near expiration).

What license does a plumber need in California?

Look for C-36 on the license. 25 businesses in Sonoma hold it. Small jobs under $1,000 with no permit and no employees are exempt; everything else needs a license (details).

How do I check a plumber's workers' comp?

Open the contractor's profile here to see the workers' comp type and insurer from CSLB's file. In Sonoma, 52% of plumbers list a policy, 48% claim an exemption and 0% show no current coverage. Confirm the policy with CSLB's workers' comp search before work starts. How to check workers' comp.

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