Licensed Septic Companies in Napa County, CA
6 septic companies serve Napa County, California, and 6 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 Napa County
Guides: Septic system installation · Septic inspection · Installation cost · Pumping cost
6 septic companies in Napa County
Napa 4
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Mr Rooter Plumbing
131 Camino Dorado, Napa, CA 94558
- Licensed: California Licensed Contractor (A, B, C36, C42) · #511333 (California Contractors State License Board, verify)
From their website: Inspection Per state license: Installation
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Napa Septic Tank Service Inc
P O Box 13, Napa, CA 94559
- Licensed: California Licensed Contractor (C42) · #254028 (California Contractors State License Board, verify)
Per state license: Installation
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P & R Septic Systems LLC
Po Box 6776, Napa, CA 94581
- Licensed: California Licensed Contractor (C42) · #482218 (California Contractors State License Board, verify)
Per state license: Installation
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Rong'S Backhoe Service
1013 Robinson Lane, Napa, CA 94558
- Licensed: California Licensed Contractor (A, C42) · #629852 (California Contractors State License Board, verify)
Per state license: Installation
American Canyon 1
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A+ Waterworks Inc
105 Reed Drive, American Canyon, CA 94503
- Licensed: California Licensed Contractor (C16, C36, C42) · #745951 (California Contractors State License Board, verify)
Per state license: Installation
Calistoga 1
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Blakeley Construction Inc
310 Franz Valley Sch Road, Calistoga, CA 94515
- Licensed: California Licensed Contractor (A, C12, C42) · #539322 (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 Napa 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 Napa County: common questions
How many licensed septic companies are in Napa County, CA?
6 septic companies serve Napa County, California, and 6 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 Napa County?
6 listings in Napa 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.