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Best Licensed Well Drilling Contractors in Sonora, CA

3 well drilling companies registered in Sonora hold current CSLB licenses, verified against official records as of August 17, 2026. All 3 are listed below, ordered by workers' compensation cover and years licensed.

How we chose: We identified 3 companies registered in Sonora. 3 passed license verification. All 3 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.Tanko Bros Inc.

    ✓ CSLB License #395633 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    1980
    Phone
    (209) 532-7797

  2. 2.Canepa And Sons Inc.

    ✓ CSLB License #425749 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    1982
    Phone
    (209) 532-1136

  3. 3.Precision Pump Service Inc.

    ✓ CSLB License #742031 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    1997
    Phone
    (209) 768-5535

Compare the top 3 at a glance

CompanyLicenseWorkers' compLicensed since
Tanko Bros Inc.#395633On file1980
Canepa And Sons Inc.#425749On file1982
Precision Pump Service Inc.#742031On file1997

Tuolumne 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: 4 active C-57 well drilling licenses in Tuolumne County, 4 of them registered in Sonora. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median Sonora license has been held 38 years, and the longest-standing one dates to 1980. 3 of Sonora's 4 licenses (75.0%) 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: 4 of the county's 4 licenses carry the same $25,000 bond California sets by statute. 1 county license reaches its 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 Sonora: common questions

How many licensed well drilling contractors are there in Sonora?

4 active C-57 well drilling licenses are registered in Sonora, out of 4 across Tuolumne County. 3 Sonora-registered companies passed our license verification, and all 3 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. 4 active C-57 well drilling licenses are registered in Sonora and 4 across Tuolumne County, the longest-standing issued in 1980. 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 3 of Sonora's 4 currently carry. 1 Tuolumne County license expires within 90 days.

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