Licensed Septic Companies in Yolo County, CA
7 septic companies serve Yolo County, California, and 7 of them hold a California septic license or certification matched to the California Contractors State License Board list (data as of October 2026).
7 septic companies in Yolo County
Woodland 4
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Aro Wastewater Systems
210 Freeman St, Woodland, CA 95695
- Licensed: California Licensed Contractor (C42) · #1151368 (California Contractors State License Board, verify)
Per state license: Installation
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Cal West Concrete Inc
1318 Leo Way, Woodland, CA 95776
- Licensed: California Licensed Contractor (C-8, C12, C13, C27, C34, C42, D06, D49) · #893450 (California Contractors State License Board, verify)
Per state license: Installation
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F & R Soil Testing
219 North College Street, Woodland, CA 95695
- Licensed: California Licensed Contractor (C42) · #952671 (California Contractors State License Board, verify)
Per state license: Installation
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Ramco Paving & Grading
34853 County Rd #22, Woodland, CA 95695
- Licensed: California Licensed Contractor (C12, C42) · #978035 (California Contractors State License Board, verify)
Per state license: Installation
Clarksburg 1
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Seebeck M E
P O Box 10, Clarksburg, CA 95612
- Licensed: California Licensed Contractor (B, C10, C20, C36, C42, C57, D21) · #801473 (California Contractors State License Board, verify)
Per state license: Installation
West Sacramento 1
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R & K Septic & Tractor Service
3080 Jefferson Blvd, West Sacramento, CA 95691
- Licensed: California Licensed Contractor (C42) · #818558 (California Contractors State License Board, verify)
Per state license: Installation
Winters 1
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Adeedo
5251 Imperial Hwy, Winters, CA 95694
- Licensed: California Licensed Contractor (B, C20, C36, C42) · #1042744 (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 Yolo 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 Yolo County: common questions
How many licensed septic companies are in Yolo County, CA?
7 septic companies serve Yolo County, California, and 7 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 Yolo County?
7 listings in Yolo 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.