GroundRosterLicensed Well and Septic Contractors: Contra Costa County, CA
55 licensed well and septic pros based in Contra Costa 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 Contra Costa County
All 22 towns named on the license records based here, with the number of listings in each, most first.
License classes on the Contra Costa 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 55.
| License class | Trade | Listings |
|---|---|---|
| Sanitation System Contractor (C-42) | Septic | 43 |
| Well Drilling Contractor (C-57) | Well | 12 |
Septic Contractors based in Contra Costa County (43)
All Bay Rooting And Plumbing ServicesLicensed
In Demand Plumbing Heating & Air INCLicensed
White L H General Building ContractorLicensed
Symbolic PlumbingLicensed
U S T Testing Services INCLicensed
American Pipe Bursting LLCLicensed
Advanced Trenchless INCLicensed
Plumbing ProLicensed
Magnificent Plumbing & Rooter INC
Bay Flow SewersLicensed
Tankless Water Heater ExpertsLicensed
Malachi Plumbing INCLicensed
Erwyn's PlumbingLicensed
Flowing WaterLicensed
Sewer And Drain Masters CorporationLicensed
Olsson Plumbing CompanyLicensed
Royal RooterLicensed
Superior Plumbing & Drain Cleaning ServicesLicensed
Guerra Bros Plumbing INCLicensed
Lifesaver Plumbing And RooterLicensed
Betti Val Plumbing & Heating INCLicensed
First Class Water Heaters INCLicensed
Drain Doctors And PlumbersLicensed
All Water Heaters & Plumbing LLCLicensed
Ernie's Plumbing & Sewer ServiceLicensed
Davila Plumbing Company INCLicensed
Better Rooter INC
H & R UndergroundLicensed
Plumbing Express INCLicensed
Everest Plumbing And DrainLicensed
N V Heathorn COLicensed
Pure Water PlumbingLicensed
Marelich Mechanical CO INC
Service Pros Plumbers INCLicensed
Echo Plumbing And RooterLicensed
Bay Plumbing & Rooter LLCLicensed
Sewer Connection INCLicensed
Corsa Plumbing And RooterLicensed
Matheneys Plumbing & HeatingLicensed
Ortega Plumbing & Rooter LLCLicensed
Clear Water Mechanical Plumbing & UndergroundLicensed
Rooter-manLicensed
Avalon RooterLicensed
Water Well Contractors based in Contra Costa County (12)
Benevent BuildingLicensed
Expert Tree ServiceLicensed
Geostructural Engineering INCLicensed
Storesund Construction INCLicensed
Greguras Francis Robert JrLicensed
Blue Flame Crew West LLCLicensed
Conetec INCLicensed
Clearwater GroupLicensed
Martell Water Systems INCLicensed
Cornish Contracting
Advanced Water Well Drilling & Pump ServicesLicensed
Drill Tech Drilling & Shoring INCLicensed
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 Contra Costa County, with national cost ranges
Listings based in Contra Costa County whose license class covers each service. Cost ranges are national; each links its cost guide.
| Service | Based in Contra Costa County | National cost |
|---|---|---|
| Septic Tank Pumping | 0 | $250 to $600 |
| Septic System Installation | 43 | $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 | 12 | $5,500 to $35,000 |
| Well Pump Repair | 0 | $1,000 to $2,500 |
None of the listings based in Contra Costa 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 Contra Costa 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?