Licensed Septic Companies in Sonoma County, CA
27 septic companies serve Sonoma County, California, and 26 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 Sonoma County
Guides: Septic tank pumping · Septic system installation · Septic inspection · Septic repair · Drain field repair · Installation cost · Pumping cost
27 septic companies in Sonoma County
Santa Rosa 11
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Austin Creek Services Inc
1528 Copperhill Parkwaysuite F, Santa Rosa, CA 95403
- Licensed: California Licensed Contractor (A, C12, C42) · #1054040 (California Contractors State License Board, verify)
Per state license: Installation
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BDK Septic Service
P O Box 7641, Santa Rosa, CA 95407
- Licensed: California Licensed Contractor (C42) · #802125 (California Contractors State License Board, verify)
From their website: Pumping · Inspection · Repair Per state license: Installation
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Bob'S Underground Septic
P O Box 11234, Santa Rosa, CA 95406
- Licensed: California Licensed Contractor (C42) · #1158760 (California Contractors State License Board, verify)
Per state license: Installation
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Drew Underground Construction Inc
P O Box 7040, Santa Rosa, CA 95407
- Licensed: California Licensed Contractor (A, C42) · #484067 (California Contractors State License Board, verify)
From their website: Drain field Per state license: Installation
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Ghilotti Construction Company Inc
246 Ghilotti Avenue, Santa Rosa, CA 95407
- Licensed: California Licensed Contractor (A, C-8, C12, C21, C42, HAZ) · #644515 (California Contractors State License Board, verify)
Per state license: Installation
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Maverick Excavating Inc
1963 Abramson Road, Santa Rosa, CA 95401
- Licensed: California Licensed Contractor (C42) · #1041206 (California Contractors State License Board, verify)
Per state license: Installation
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Moore Home Heating Cooling & Plumbing Services
400 Tesconi Circle, Santa Rosa, CA 95401
- Licensed: California Licensed Contractor (B, C-2, C10, C20, C36, C42) · #1051850 (California Contractors State License Board, verify)
- Licensed: California Licensed Contractor (B, C10, C20, C36, C46) · #513115 (California Contractors State License Board, verify)
From their website: Inspection Per state license: Installation
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Neighbor Homes
P O Box 6851, Santa Rosa, CA 95406
- Licensed: California Licensed Contractor (B, C42) · #357397 (California Contractors State License Board, verify)
Per state license: Installation
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Russian River Septic & Wine Waste
P O Box 7436, Santa Rosa, CA 95407
- Licensed: California Licensed Contractor (C42) · #1073817 (California Contractors State License Board, verify)
Per state license: Installation
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Sanitary Solutions Corp
2021 Bluebell Drive, Santa Rosa, CA 95403
- Licensed: California Licensed Contractor (C42) · #1153958 (California Contractors State License Board, verify)
Per state license: Installation
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Sbragia Septic Services LLC
P O Box 7593, Santa Rosa, CA 95407
- Licensed: California Licensed Contractor (C42) · #1161730 (California Contractors State License Board, verify)
Per state license: Installation
Petaluma 6
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Keller Charles Construction Inc
1350 Industrial Avenue Suite C, Petaluma, CA 94952
- Licensed: California Licensed Contractor (B, C12, C34, C42) · #885844 (California Contractors State License Board, verify)
Per state license: Installation
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Masterson Bryan Enterprises
1364 N Mcdowell Blvd #12, Petaluma, CA 94954
- Licensed: California Licensed Contractor (A, B, C-4, C16, C20, C34, C36, C42) · #271933 (California Contractors State License Board, verify)
Per state license: Installation
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Ongaro & Sons
719 Southpoint Blvd, Petaluma, CA 94954
- Licensed: California Licensed Contractor (C-4, C10, C16, C20, C34, C36, C39, C42, C43, C60, D21) · #215233 (California Contractors State License Board, verify)
From their website: Inspection · Perc testing Per state license: Installation
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Paul Michael Company Inc
1200 Casa Grande Rd, Petaluma, CA 94954
- Licensed: California Licensed Contractor (A, C12, C34, C42) · #386001 (California Contractors State License Board, verify)
Per state license: Installation
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Redwood Septic Services
717 North Mcdowell Blvdspc 102, Petaluma, CA 94954
- Licensed: California Licensed Contractor (C42) · #1158226 (California Contractors State License Board, verify)
Per state license: Installation
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Environmental Pump Services
Petaluma, CA 94952, Petaluma, CA 94952
From their website: Pumping · Grease traps
Forestville 3
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Horobin Construction Inc
10449 Scenic Dr, Forestville, CA 95436
- Licensed: California Licensed Contractor (B, C42) · #746917 (California Contractors State License Board, verify)
Per state license: Installation
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Jfm Septic System Installation LLC
P O Box 280, Forestville, CA 95436
- Licensed: California Licensed Contractor (A, C42) · #1068533 (California Contractors State License Board, verify)
Per state license: Installation
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Nicholas Johnson Innovative Systems Inc
P O Box 879, Forestville, CA 95436
- Licensed: California Licensed Contractor (C42) · #462989 (California Contractors State License Board, verify)
Per state license: Installation
Cotati 2
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Berry Kevin Lee
Po Box 658, Cotati, CA 94931
- Licensed: California Licensed Contractor (C42) · #491815 (California Contractors State License Board, verify)
- Licensed: California Licensed Contractor (C42) · #458868 (California Contractors State License Board, verify)
Per state license: Installation
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C & C Contracting
Po Box 7213, Cotati, CA 94931
- Licensed: California Licensed Contractor (C42) · #823983 (California Contractors State License Board, verify)
Per state license: Installation
Cazadero 1
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Bohan & Canelis General Engineering Inc
P O Box 186, Cazadero, CA 95421
- Licensed: California Licensed Contractor (A, C12, C42) · #829905 (California Contractors State License Board, verify)
Per state license: Installation
Geyserville 1
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M M Miller Construction Inc
P O Box 764, Geyserville, CA 95441
- Licensed: California Licensed Contractor (A, C21, C42, D49) · #865112 (California Contractors State License Board, verify)
From their website: Installation · Inspection · Repair · Drain field
Penngrove 1
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La Bare Nicole
50 Crest Way, Penngrove, CA 94951
- Licensed: California Licensed Contractor (C42) · #1070414 (California Contractors State License Board, verify)
Per state license: Installation
Sonoma 1
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Peterson Mechanical Inc
P O Box 450, Sonoma, CA 95476
- Licensed: California Licensed Contractor (B, C-4, C16, C20, C34, C36, C38, C42, C43) · #171486 (California Contractors State License Board, verify)
Per state license: Installation
Windsor 1
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Rebich Construction Inc
P O Box 1087, Windsor, CA 95492
- Licensed: California Licensed Contractor (A, B, C42) · #675200 (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 Sonoma 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 Sonoma County: common questions
How many licensed septic companies are in Sonoma County, CA?
27 septic companies serve Sonoma County, California, and 26 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 pump septic tanks in Sonoma County?
2 of the 27 listings in Sonoma County offer septic tank pumping, either on their own website or under a state pumper license. Use the service filter above to show only those companies.
Which companies install septic systems in Sonoma County?
26 listings in Sonoma 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.