GroundRosterLicensed Well and Septic Contractors: Sonoma County, CA
49 licensed well and septic pros based in Sonoma County. Every license number below is sourced from public licensing records, with a link to look it up yourself.
Grouped by the county of the address on each license record, which can be a mailing address, so it doesn't tell you where the business works. When the record names no county, we place it by ZIP code, then town.
Checked against California Contractors State License Board (CSLB). Roster copy last refreshed 2026-08-17.
Towns in Sonoma County
All 13 towns named on the license records based here, with the number of listings in each, most first.
License classes on the Sonoma County records
Each class as the issuing agency prints it on the license record. A record that names more than one class counts once under each, so the rows can add up to more than 49.
| License class | Trade | Listings |
|---|---|---|
| Sanitation System Contractor (C-42) | Septic | 27 |
| Well Drilling Contractor (C-57) | Well | 22 |
Septic Contractors based in Sonoma County (27)
Maverick Excavating INC
Rebich Construction INCLicensed
La Bare Nicole
Drew Underground ConstructionLicensed
Ongaro & SonsLicensed
Neighbor HomesLicensed
Miller M M ConstructionLicensed
Nicholas Johnson Innovative Systems INCLicensed
Peterson Mechanical INCLicensed
Keller Charles Construction INCLicensed
Horobin Construction INCLicensed
Austin Creek Services INCLicensed
C & C ContractingLicensed
Moore Home ServicesLicensed
Roy's Sewer Service INCLicensed
Redwood Septic ServicesLicensed
Bohan & Canelis General Engineering INCLicensed
Paul Michael Company INC
Ghilotti Construction Company INCLicensed
Berry Kevin LeeLicensed
Sanitary Solutions CorpLicensed
Jfm Septic System Installation LLCLicensed
Bob's Underground SepticLicensed
Bdk Septic ServiceLicensed
Masterson Bryan EnterprisesLicensed
Trinity Oak's Septic Service
Russian River Septic & Wine WasteLicensed
Water Well Contractors based in Sonoma County (22)
Holden Ralph & COLicensed
Jerry And Don's Yager Pump And Well ServiceLicensed
Northbay Well & Pump Service
Petersen Les Drilling & Pump INCLicensed
Oasis Pump & DrillingLicensed
Fisch Bros DrillingLicensed
Razo Drilling And Pump INCLicensed
Koenig JustinLicensed
Davis D A Company
Pumpman NorcalLicensed
Koenig DrillingLicensed
Stapleton Brett AustinLicensed
Weeks Drilling And Pump COLicensed
Alberigi BillyLicensed
Larbre Well Drilling And Pumps INCLicensed
Waterworks Industries LLCLicensed
Petersen - Gpm Well Testing And Water Treatment Services LLCLicensed
Pacific Coast Drilling Company INCLicensed
Anthony Joseph AdiegoLicensed
Pearson DrillingLicensed
Clear Heart Drilling INCLicensed
Northbay Well And Pump LLCLicensed
Own one of these businesses? Find your listing and claim it.
Looking for a specific contractor? Search by name, business name, or license number.
Services in Sonoma County, with national cost ranges
Listings based in Sonoma County whose license class covers each service. Cost ranges are national; each links its cost guide.
| Service | Based in Sonoma County | National cost |
|---|---|---|
| Septic Tank Pumping | 0 | $250 to $600 |
| Septic System Installation | 27 | $3,600 to $12,500 |
| Septic Inspection | 0 | $150 to $900 |
| Septic System Design | 0 | Varies by site |
| Perc Test and Soil Evaluation | 0 | $250 to $1,000 |
| Well Drilling | 22 | $5,500 to $35,000 |
| Well Pump Repair | 0 | $1,000 to $2,500 |
None of the listings based in Sonoma County hold a license class we can match to septic tank pumping, septic inspection, septic system design, perc test and soil evaluation or well pump repair. Ask any contractor whether they do this work, or try a nearby city.
Hiring a well and septic professional in Sonoma County
Before you sign anything: confirm the license on this page is still active with the agency that issued it, ask for proof of insurance, and get at least three written quotes; pricing on this work varies widely by site conditions.
Do I need a permit for well or septic work in California?