Licensed Septic Companies in San Mateo County, CA
5 septic companies serve San Mateo County, California, and 5 of them hold a California septic license or certification matched to the California Contractors State License Board list (data as of October 2026).
Septic services in San Mateo County
Guides: Septic system installation · Septic inspection · Installation cost · Pumping cost
5 septic companies in San Mateo County
Brisbane 1
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George Salet Plumbing, Inc.
200 Valley Dr, Brisbane, CA 94005
- Licensed: California Licensed Contractor (C16, C36) · #888630 (California Contractors State License Board, verify)
From their website: Inspection
Daly City 1
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S And G Plumbing
126 Ardendale Dr, Daly City, CA 94014
- Licensed: California Licensed Contractor (C36) · #841206 (California Contractors State License Board, verify)
- Licensed: California Licensed Contractor (C36, C42) · #808214 (California Contractors State License Board, verify)
Per state license: Installation
Loma Mar 1
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Conner Christopher Construction
40 Wurr Rd, Loma Mar, CA 94021
- Licensed: California Licensed Contractor (B, C42) · #858858 (California Contractors State License Board, verify)
Per state license: Installation
Redwood City 1
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Valley Sewer Maintenance LLC
1260 Westwood St, Redwood City, CA 94061
- Licensed: California Licensed Contractor (C42) · #1161078 (California Contractors State License Board, verify)
Per state license: Installation
San Mateo 1
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J W Mcclenahan Co
2301 Palm Ave, San Mateo, CA 94403
- Licensed: California Licensed Contractor (C-4, C20, C36, C42, C60) · #308818 (California Contractors State License Board, verify)
Per state license: Installation
No listings match those filters.
Septic licensing in California
California has no license named for septic work; septic systems fall under the C-42 Sanitation System classification. Counties issue system permits. The Contractors State License Board (CSLB) issues these credentials: C-42 Sanitation System contractor license.
Permits for new systems, replacements and most repairs are issued locally. Ask the contractor which office handles San Mateo County and whether the permit fee is in their quote.
California septic licensing: agencies, license types and how to check a license →
Septic companies in San Mateo County: common questions
How many licensed septic companies are in San Mateo County, CA?
5 septic companies serve San Mateo County, California, and 5 of them hold a California septic license or certification matched to the California Contractors State License Board list (data as of October 2026). Each license badge on this page names the agency and links to its lookup so you can confirm it.
Who licenses septic contractors in California?
California has no license named for septic work; septic systems fall under the C-42 Sanitation System classification. Counties issue system permits. The licensing body is the Contractors State License Board (CSLB).
Which companies install septic systems in San Mateo County?
4 listings in San Mateo County install septic systems. New systems and replacements need a permit, so ask each installer to handle the permit and to show their California license.
How do I check a septic contractor's license in California?
Use the Contractors State License Board (CSLB)'s lookup (https://www.cslb.ca.gov/onlineservices/checklicenseII/checklicense.aspx) and search the contractor's name or license number. Our guide to checking a septic license walks through it.