GroundRosterLicensed Well and Septic Contractors: Yellowstone County, MT
24 licensed well and septic pros based in Yellowstone 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 Montana DEQ - Licensed Septic Pumpers and Montana DNRC Board of Water Well Contractors. Roster copy last refreshed 2026-08-19.
Towns in Yellowstone County
All 2 towns named on the license records based here, with the number of listings in each, most first.
License classes on the Yellowstone 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 24.
| License class | Trade | Listings |
|---|---|---|
| Licensed Septic Pumper | Septic | 13 |
| Monitoring Well Constructor | Well | 6 |
| Water Well Contractor | Well | 3 |
| Water Well Contractor, Water Well Driller | Well | 2 |
Septic Contractors based in Yellowstone County (13)
Tru Pipe INCLicensed
Cotter's Sewer INCLicensed
Portable Restroom Service LLCLicensed
Tlc-patriot Septic And Excavation LLCLicensed
Brenda Frank Septic Tank ServiceLicensed
Bogy INCLicensed
Wells Built Homes INCLicensed
C Bar J MechanicalLicensed
Billings Construction Supply, INCLicensed
Kernow INCLicensed
Andersen Sewer LLCLicensed
Arrow Septic And Sewer Service LLCLicensed
PaceLicensed
Water Well Contractors based in Yellowstone County (11)
Brandon LearLicensed
Paul BrayLicensed
Liam MacdonaldLicensed
Joseph MayesLicensed
Dick DeckerLicensed
Marvin JewettLicensed
Craig EggumLicensed
Paul LemireLicensed
Chad BinstockLicensed
Charles PetersonLicensed
Charles LanzLicensed
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 Yellowstone County, with national cost ranges
Listings based in Yellowstone County whose license class covers each service. Cost ranges are national; each links its cost guide.
| Service | Based in Yellowstone County | National cost |
|---|---|---|
| Septic Tank Pumping | 13 | $250 to $600 |
| Septic System Installation | 0 | $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 | 11 | $5,500 to $35,000 |
| Well Pump Repair | 0 | $1,000 to $2,500 |
None of the listings based in Yellowstone County hold a license class we can match to septic system installation, 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 Yellowstone 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 Montana?