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Best Licensed Septic Contractors in Castro Valley, CA

4 septic companies registered in Castro Valley 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 Castro Valley. 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.Streamline Plumbing & Drain Co

    ✓ CSLB License #672250 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    1993
    Phone
    (510) 481-0380

  2. 2.Frank Bonetti Plumbing Inc.

    ✓ CSLB License #251165 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    1967
    Phone
    (510) 582-0934

  3. 3.Owen

    ✓ CSLB License #395410 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    1980
    Phone
    (510) 583-0984

  4. 4.Aaa Plumbing & Remodeling Inc.

    ✓ CSLB License #1052769 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    2019
    Phone
    (510) 737-2376

Compare the top 4 at a glance

CompanyLicenseWorkers' compLicensed since
Streamline Plumbing & Drain Co#672250On file1993
Frank Bonetti Plumbing Inc.#251165Exempt or none on file1967
Owen#395410Exempt or none on file1980
Aaa Plumbing & Remodeling Inc.#1052769Exempt or none on file2019

Alameda County septic licensure at a glance

California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 71 active C-42 sanitation system licenses in Alameda County, 4 of them registered in Castro Valley. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median Castro Valley license has been held 33 years, and the longest-standing one dates to 1967. 1 of Castro Valley's 4 licenses (25.0%) carries 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: 71 of the county's 71 licenses carry the same $25,000 bond California sets by statute. 11 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 Castro Valley: common questions

How many licensed septic contractors are there in Castro Valley?

4 active C-42 sanitation system licenses are registered in Castro Valley, out of 71 across Alameda County. 4 Castro Valley-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 septic contractors?

Yes. California licenses contractors by classification, and C-42 is the CSLB classification that authorises this work. 4 active C-42 sanitation system licenses are registered in Castro Valley and 71 across Alameda County, the longest-standing issued in 1967. 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 1 of Castro Valley's 4 currently carry. 11 Alameda County licenses expire within 90 days.

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