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Best Licensed Septic Contractors in Pasadena, CA

4 septic companies registered in Pasadena 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 Pasadena. 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.Acco Engineered Sytems, Inc.

    ✓ CSLB License #120696 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    1950
    Phone
    (818) 244-6571

  2. 2.Geo H Wilson Mechanical Contractors

    ✓ CSLB License #950443 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    2010
    Phone
    (831) 423-9522

  3. 3.Acco-wilson, Inc.

    ✓ CSLB License #1042403 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    2018
    Phone
    (831) 244-6571

  4. 4.Leedco Tech Inc.

    ✓ CSLB License #849598 - look up this number at CSLB
    Verified
    August 17, 2026
    Licensed since
    2004
    Phone
    (626) 758-8089

Compare the top 4 at a glance

CompanyLicenseWorkers' compLicensed since
Acco Engineered Sytems, Inc.#120696On file1950
Geo H Wilson Mechanical Contractors#950443On file2010
Acco-wilson, Inc.#1042403On file2018
Leedco Tech Inc.#849598On file2004

Los Angeles County septic licensure at a glance

California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 163 active C-42 sanitation system licenses in Los Angeles County, 4 of them registered in Pasadena. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median Pasadena license has been held 8 years, and the longest-standing one dates to 1950. 4 of Pasadena's 4 licenses (100.0%) 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: 162 of the county's 163 licenses carry the same $25,000 bond California sets by statute. 13 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 Pasadena: common questions

How many licensed septic contractors are there in Pasadena?

4 active C-42 sanitation system licenses are registered in Pasadena, out of 163 across Los Angeles County. 4 Pasadena-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 Pasadena and 163 across Los Angeles County, the longest-standing issued in 1950. 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 Pasadena's 4 currently carry. 13 Los Angeles County licenses expire within 90 days.

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