The Yellowstone County list: 73 septic installers, as the county publishes it (list updated March 2026). Being on the list means the county listed them, not that we recommend them. Call RiverStone Health, Environmental Health Services at 406-256-2770 to confirm current standing.
| Company | Contact | Role | Phone |
|---|---|---|---|
| All Design Landscaping & Homes | Justin Wagner | Septic installer | 406-208-0799 |
| Anderson Sewer | Mathew Carter | Septic installer | 406-245-7593 |
| Arrow Septic and Sewer LLC | Carl Openshaw | Septic installer | 406-850-7178 |
| Askin Construction LLC | Dennis Ross | Septic installer | 406-702-1097 |
| B & C Home Builders | Boyce Smith | Septic installer | 406-697-3884 |
| Bangert Construction & Excavation | Loren Bangert | Septic installer | 406-294-5111 |
| Billings Pump & Irrigation | Terry Welborn | Septic installer | 406-245-6139 |
| C Bar J Mechanical | Jared Wicks | Septic installer | 406-698-8932 |
| COT Underground | Spencer Clampitt | Septic installer | 406-281-8939 |
| CSI Inc. | Wade Spalinger | Septic installer | 406-281-0401 |
| Castlerock Excavating Inc. | Joel Hoagland | Septic installer | 406-294-5144 |
| Clear Creek Construction | Brad Riedlinger | Septic installer | 406-861-4159 |
| Cleaveland Sewer | Robert Cleaveland | Septic installer | 406-325-2512 |
| Cohesive Construction & Excavation | Anthony DiNoto | Septic installer | 406-426-0388 |
| Current Inc | Dale Hanson | Septic installer | 406-252-8932 |
| DT Services | David Kennedy | Septic installer | 406-294-5355 |
| Davidson Underground LLC | Zachary R Davidson | Septic installer | 406-998-9435 |
| Digger Excavation | Robert Spadt | Septic installer | 406-861-3821 |
| Dobson Grading and Utility LLC | Alan Dobson | Septic installer | 406-428-8484 |
| Dolar Excavation LLC | Seth Dolar | Septic installer | 406-200-0062 |
| Drop Tine Plumbing & Heating | Robert Styren | Septic installer | 406-690-2408 |
| ECO-Built Homes | Ed Trout | Septic installer | 406-256-0007 |
| EEC, Inc. | Charles Henrichs | Septic installer | 406-839-9151 |
| Earth Movers Excavation Inc | A.J. Leavitt | Septic installer | 406-598-6007 |
| Gary Weber Construction | Kurt & Mark Weber | Septic installer | 406-656-5066 |
| Grizzly Peak Excavation | David Weber | Septic installer | 406-690-2656 |
| Hackmann Construction | Joseph Hackmann | Septic installer | 406-694-8100 |
| Hample Excavation, Inc. | Tyler Hample | Septic installer | 406-373-6456 |
| Hellroaring Excavation | Jeremy Hogsett | Septic installer | 406-647-8535 |
| J C Excavation | Justin Sorlie | Septic installer | 406-670-8373 |
| JJP Companies | John Poukish | Septic installer | 970-390-1898 |
| JNR Excavating | Jason Stene | Septic installer | 406-860-8880 |
| Jacob Latif | Septic installer | 702-701-1098 | |
| Jett Development | Kennedy Walsh | Septic installer | 406-861-7900 |
| Jim Rooney | Septic installer | 406-670-6961 | |
| KE Construction | Bryce Kirschenmann | Septic installer | 406-855-8004 |
| LTD Construction LLC | Steven Shuman | Septic installer | 406-763-6583 |
| MTN Construction LLC | Bridger Severson | Septic installer | 406-794-2342 |
| Millennium Construction & Consltg | Justin Olden | Septic installer | 406-860-0405 |
| Mountain Earth Works LLC | Greg Evertz | Septic installer | 406-591-6304 |
| Mountain Top Contracting | Zander Krushensky | Septic installer | 406-599-6931 |
| Natural Elements | Mark Owens | Septic installer | 406-545-6300 |
| Northern Rockies Extreme Customs | Brian Geffie | Septic installer | 406-694-4111 |
| Overtime Enterprises Inc. | Buckley Reynolds | Septic installer | 406-861-4797 |
| Pfeifle Construction | Randy Pfeifle | Septic installer | 406-855-1075 |
| Prairie Builders, LLC | Sam Peila | Septic installer | 406-698-8325 |
| RPM Contracting LLC | Marc Pankratz | Septic installer | 406-392-7020 |
| Ridge Pointe Builders | Daniel Suckow | Septic installer | 406-633-1002 |
| Ridge Pointe Builders | Kane Thatcher | Septic installer | 406-633-1002 |
| Rimrock Dirtworks LLC | David Megorden | Septic installer | 406-672-7442 |
| Rimrock Excavation | Gary Glantz | Septic installer | 406-281-3641 |
| Rock Solid Excavating Inc | CJ Baker | Septic installer | 406-855-8371 |
| Ryan Keeland Excavation LLC | Ryan Keeland | Septic installer | 406-839-3745 |
| Schessler Excavation & Septic | Rob/Heston Schessler | Septic installer | 406-628-4221 |
| Shining Mountain Enterprises | Michael Novotny | Septic installer | 406-855-1425 |
| Site Solutions | Tim Mann | Septic installer | 406-208-9232 |
| Solland Enterprises | Shawn Solland | Septic installer | 406-698-0356 |
| Sparks Inc | Sam Sparks | Septic installer | 406-656-0980 |
| Stuart Andersen | Septic installer | 406-698-6339 | |
| Sundance Carpentry | Ryan Mershon | Septic installer | 406-690-6555 |
| Superior Construction Inc. | Nickos Vlahos | Septic installer | 406-672-3661 |
| T L Dietz Contractors LLC | Troy Dietz | Septic installer | 406-859-5767 |
| T L Dirtwork | Tyler Loomis | Septic installer | 406-861-8249 |
| TLC Patriot | James E O'Lexey | Septic installer | 406-633-4333 |
| Tim Harper Construction | Tim Harper | Septic installer | 406-320-0946 |
| Vinton Construction Inc. | Michael Vinton | Septic installer | 406-248-1984 |
| Wells Built Homes | Curt Rawson | Septic installer | 406-656-1301 |
| Western Septic & Vac Truck Services | Jonathan Rasmusson | Septic installer | 406-298-0650 |
| Wolf Construction | Sheldon Wolf | Septic installer | 406-591-2033 |
| YC Contractors | Michael Hunter | Septic installer | 406-690-5954 |
| YPS-Yellowstone Property Solutions | David Mutch | Septic installer | 406-294-5355 |
| Yellowstone Excavation | Shane Fuchs | Septic installer | 406-850-3497 |
| Z & S Construction | Shane Sheridan | Septic installer | 406-855-9160 |
Before you hire, read the septic guide and how to check a contractor. Mapped soils and septic outlook for one parcel: Montana Build Report.
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