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Best Licensed Well Drilling Contractors in Petaluma, CA

4 well drilling companies registered in Petaluma hold current CSLB licenses, verified against official records as of August 17, 2026. All 4 are listed below, ordered by workers' compensation cover and years licensed.

How we chose: We identified 4 companies registered in Petaluma. 4 passed license verification. All 4 are listed below. Our methodology

We earn a fee when you call businesses through numbers on this site. This never affects who is listed or how they rank.

  1. 1.Oasis Pump & Drilling

    ✓ CSLB License #242168 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    1966
    Phone
    (707) 762-4028

  2. 2.Mickelson Enterprises Inc. DBA Jerry And Don's Yager Pump And Well

    ✓ CSLB License #424778 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    1982
    Phone
    (707) 762-1473

  3. 3.Northbay Well And Pump LLC

    ✓ CSLB License #498942 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    1986
    Phone
    (707) 755-1149

  4. 4.Anthony Joseph Adiego

    ✓ CSLB License #1130270 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    2024
    Phone
    (707) 975-4083

Compare the top 4 at a glance

CompanyLicenseWorkers' compLicensed since
Oasis Pump & Drilling#242168On file1966
Mickelson Enterprises Inc. DBA Jerry And Don's Yager Pump And Well#424778On file1982
Northbay Well And Pump LLC#498942Exempt or none on file1986
Anthony Joseph Adiego#1130270Exempt or none on file2024

Sonoma County well drilling licensure at a glance

California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 19 active C-57 well drilling licenses in Sonoma County, 5 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 39 years, and the longest-standing one dates to 1966. 2 of Petaluma's 5 licenses (40.0%) 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: 19 of the county's 19 licenses carry the same $25,000 bond California sets by statute. 2 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.

Well Drilling Contractors in Petaluma: common questions

How many licensed well drilling contractors are there in Petaluma?

5 active C-57 well drilling licenses are registered in Petaluma, out of 19 across Sonoma County. 4 Petaluma-registered companies passed our license verification, and all 4 are listed on this page. Only licenses CSLB shows as CLEAR and unexpired are listed.

Does California license well drilling contractors?

Yes. California licenses contractors by classification, and C-57 is the CSLB classification that authorises this work. 5 active C-57 well drilling licenses are registered in Petaluma and 19 across Sonoma County, the longest-standing issued in 1966. Only CLEAR, unexpired licenses appear here.

How do I check a well drilling contractor'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 2 of Petaluma's 5 currently carry. 2 Sonoma County licenses expire within 90 days.

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