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Best Licensed Septic Contractors in Petaluma, CA

5 septic companies registered in Petaluma hold current CSLB licenses, verified against official records as of August 17, 2026. All 5 are listed below, ordered by workers' compensation cover and years licensed.

How we chose: We identified 5 companies registered in Petaluma. 5 passed license verification. All 5 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. Verified
    August 17, 2026
    Licensed since
    1963
    Phone
    (707) 579-3511
  2. Verified
    August 17, 2026
    Licensed since
    1971
    Phone
    (707) 971-7686
  3. Verified
    August 17, 2026
    Licensed since
    1979
    Phone
    (707) 769-1006
  4. Verified
    August 17, 2026
    Licensed since
    2006
    Phone
    (707) 762-9000
  5. Verified
    August 17, 2026
    Licensed since
    2026
    Phone
    (707) 332-2151

Compare the top 5 at a glance

CompanyLicenseWorkers' compLicensed since
Ernest Ongaro & Sons Inc. DBA Ongaro & Sons#215233On file1963
Bryan Masterson Enterprises#271933On file1971
Michael Paul Company Inc.#386001On file1979
Charles Keller Construction Inc.#885844On file2006
Redwood Septic Services#1158226Exempt or none on file2026

Sonoma County septic licensure at a glance

California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 25 active C-42 sanitation system 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 46 years, and the longest-standing one dates to 1963. 4 of Petaluma's 5 licenses (80.0%) 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: 25 of the county's 25 licenses carry the same $25,000 bond California sets by statute. 3 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.

Septic Contractors in Petaluma: common questions

How many licensed septic contractors are there in Petaluma?

5 active C-42 sanitation system licenses are registered in Petaluma, out of 25 across Sonoma County. 5 Petaluma-registered companies passed our license verification, and all 5 are listed on this page. Only licenses CSLB shows as CLEAR and unexpired are listed.

Does California license septic contractors?

Yes. California licenses contractors by classification, and C-42 is the CSLB classification that authorises this work. 5 active C-42 sanitation system licenses are registered in Petaluma and 25 across Sonoma County, the longest-standing issued in 1963. Only CLEAR, unexpired licenses appear here.

How do I check a septic 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 4 of Petaluma's 5 currently carry. 3 Sonoma County licenses expire within 90 days.

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