| Company | Location | Certifications | License # |
|---|---|---|---|
| A & T Excavation | Duluth, MN | Installer | L3156 |
| A1 Services Inc | Eveleth, MN | DesignerInspectorInstallerPumper | L315 |
| Advanced Excavating & Onsite Systems LLC | Cloquet, MN | DesignerInstaller | L2906 |
| Advanced Services, Inc | Moose Lake, MN | InstallerPumper | L3682 |
| AJR Ely Inc | Ely, MN | Installer | L2744 |
| American Septic LLC | Iron, MN | Pumper | L4292 |
| ATK Enterprises Inc. | Hermantown, MN | Installer | L4368 |
| Big Lake Contracting LLC | Duluth, MN | Installer | L3905 |
| Bodri Enterprises, Inc. | Cook, MN | Designer (Advanced)Inspector (Advanced) | L4284 |
| Bougalis Construction Inc | Hibbing, MN | DesignerInspectorInstaller | L2695 |
| Boundary Waters Septic, LLC | Embarrass, MN | Pumper | L4160 |
| Brent's Biffies, Inc. | Saginaw, MN | Pumper | L3863 |
| Brent's Septic Service, LLC | Duluth, MN | Pumper | L2833 |
| Brett Kolquist Trucking LLC | Duluth, MN | Installer | L4498 |
| Butch Seeley Excavating LLC | Duluth, MN | DesignerInstaller | L916 |
| C & C Winger Inc | Embarrass, MN | Installer | L2662 |
| Cedar Drive Excavating Inc | Duluth, MN | Installer | L1559 |
| CJ Septic and Repair LLC | Proctor, MN | Inspector | L4319 |
| Cloquet Constructors | Cloquet, MN | DesignerInspectorInstaller | L941 |
| Contour Inc. | Duluth, MN | Installer | L4299 |
| Cornerstone Excavation LLC | Floodwood, MN | Installer | L4478 |
| Debeltz Septic Design | Embarrass, MN | Designer | L4255 |
| DeCaigny Excavating Inc | Sawyer, MN | DesignerInspectorInstaller | L957 |
| Digger DJ, Inc. | Duluth, MN | DesignerInspectorInstaller | L1613 |
| Dirt Work Specialists, LLC | Duluth, MN | Installer | L2918 |
| Duluth Excavating & Septic Services LLC | Saginaw, MN | DesignerInstaller | L4380 |
| Duluth Sewer & Septic Corporation | Duluth, MN | Installer | L4473 |
| E-Z Excavating, Inc. | Ely, MN | DesignerInstaller | L490 |
| Eagle Lake Excavating LLC | Duluth, MN | Installer | L2340 |
| Emerging Technical Group Inc | Hibbing, MN | Designer (Advanced)Inspector (Advanced)Installer | L2386 |
| Frank Sever Dirt Works, LLC | Chisholm, MN | DesignerInspectorInstaller | L4295 |
| Frye Construction | Makinen, MN | DesignerInstaller | L1391 |
| George Bougalis & Sons Company | Hibbing, MN | Installer | L102 |
| Great Lakes Excavating, Inc. | Duluth, MN | Installer | L2937 |
| Greg Kunst Construction Inc | Duluth, MN | Installer | L1821 |
| Ground Effects Directional Drilling | Saginaw, MN | Installer | L2363 |
| H & M Earth Works LLC | Cook, MN | Installer | L4459 |
| Hedberg Excavating LLC | Duluth, MN | Installer | L993 |
| Hegfors, Inc. | Ely, MN | Installer | L2342 |
| Holman Contracting Incorporated | Duluth, MN | Installer | L1669 |
| Hoss Construction LLC | Saginaw, MN | DesignerInstaller | L4115 |
| J C Design | Iron Junction, MN | DesignerInspector | L1688 |
| JBN Inc | Iron, MN | Designer (Advanced)Inspector (Advanced)Installer | L2645 |
| Jeff Crosby | Duluth, MN | Designer (Advanced)Inspector (Advanced) | L2928 |
| Jeff Schanche | Side Lake, MN | DesignerInspector | L4053 |
| JJZ Excavating | Britt, MN | Installer | L3035 |
| John Graham | Cloquet, MN | Installer | L2763 |
| Josh Antus Construction Company Inc | Angora, MN | DesignerInstaller | L2705 |
| JP Dirt Work LLC | Cook, MN | DesignerInspectorInstaller | L4453 |
| JP Sitework LLC | Two Harbors, MN | Installer | L2332 |
| Kris Nyman Excavating | Ely, MN | Installer | L4136 |
| Lakehead Trucking, Inc. | Duluth, MN | Installer | L1540 |
| Lakes Aquatic Weed Removal LLC | Orr, MN | Installer | L4252 |
| Larry Marks Trucking | Babbitt, MN | DesignerInspectorInstaller | L1831 |
| Ledgerock Landscaping & Excavating LLC | Babbitt, MN | Installer | L4408 |
| Leustek Sand & Gravel Company | Chisholm, MN | DesignerInspectorInstaller | L558 |
| Levine & Son Inc | Duluth, MN | Installer | L1064 |
| Marshall Hinden Contracting Inc | Ely, MN | Installer | L163 |
| MATRIX Soils and Systems, Inc. | Rice Lake, MN | Designer (Advanced)Inspector (Advanced) | L2028 |
| Meadows Inc. | Saginaw, MN | Installer | L4330 |
| Midway Sewer Service | Proctor, MN | Pumper | L4302 |
| Midway Sewer Service | Duluth, MN | Pumper | L4520 |
| Midwest Transport & Excavating, Inc | Brookston, MN | Installer | L2294 |
| Miskulin Construction Inc | Chisholm, MN | DesignerInstaller | L2694 |
| MNM Excavating Inc | Embarrass, MN | DesignerInstaller | L3124 |
| North Shore Sanitary | Duluth, MN | Pumper | L1783 |
| Northern Environmental Solutions LLC | Duluth, MN | DesignerInspectorInstallerPumper | L4072 |
| Northern Geoseptic Inc | Ely, MN | Designer (Advanced)Inspector (Advanced) | L4321 |
| Northern Lakes Septic LLC | Duluth, MN | Inspector | L4463 |
| Northern Waters Constructions, Inc. | Cook, MN | Installer | L3674 |
| Oachs Sewer Service | Cloquet, MN | Pumper | L4265 |
| Orton Construction and Consulting LLC | Britt, MN | Designer (Advanced)Inspector (Advanced)Installer | L1236 |
| Peterson and Sons Septic Services LLC | Embarrass, MN | Pumper | L4332 |
| Peterson Excavating and Landscaping LLC | Duluth, MN | Installer | L3208 |
| Peterson Septic Pumping, LLC | Duluth, MN | Pumper | L3260 |
| Phillips Excavating LLC | Angora, MN | Installer | L4521 |
| Piontek Construction Inc | Floodwood, MN | DesignerInstaller | L1182 |
| Portable John | Hibbing, MN | Pumper | L4076 |
| Portage Construction | Buyck, MN | Installer | L530 |
| Premier Companies, Inc. | Duluth, MN | Installer | L4322 |
| Ralph Swanson Company, Inc. | Ely, MN | Installer | L1288 |
| Randy Thomas Trucking LLC | Makinen, MN | Installer | L4446 |
| Robert Tisovich | Ely, MN | Installer | L2777 |
| Robinson Lake Trucking | Ely, MN | Installer | L4118 |
| Rocky Ledge Pumping | Ray, MN | Pumper | L3867 |
| Schulze Excavating Inc | Ely, MN | DesignerInstaller | L1826 |
| Semper Fi Excavation LLC | Duluth, MN | Installer | L4526 |
| Shelton Excavating Inc | Saginaw, MN | Installer | L859 |
| Side Lake Septic Service | Side Lake, MN | Pumper | L2435 |
| Sinko Excavating & Septic LLC | Chisholm, MN | DesignerInstaller | L936 |
| Smith Excavating LLC | Duluth, MN | Installer | L4472 |
| Sokoloski Septic & Excavating Inc | Orr, MN | Installer | L2601 |
| Spectrum Research, Inc. | Duluth, MN | Designer (Advanced)Inspector (Advanced) | L2215 |
| Steve Snyder Construction Inc | Hermantown, MN | Installer | L2191 |
| Steve's Septic Pumping Service Inc | Duluth, MN | Pumper | L2987 |
| Superior Construction Company Inc of Duluth Minnesota | Duluth, MN | Installer | L1195 |
| Swampthing Environmental LLC | Duluth, MN | DesignerInspector | L2142 |
| Toms Septic Service | Duluth, MN | DesignerInspectorInstaller | L4476 |
| Udovich Enterprises LLC | Gheen, MN | DesignerInstallerPumper | L4243 |
| Vermilion Construction Inc | Cook, MN | Installer | L1230 |
| Viele Contracting Inc. | Duluth, MN | Installer | L4314 |
| Viitas Excavating Inc | Cook, MN | Designer (Advanced)InspectorInstallerPumper | L1724 |
| Warren Johnson Logging, Inc. | Ely, MN | DesignerInstaller | L2407 |
| Wood Brothers Excavating, LLC | Colton, MN | Installer | L4068 |
104 companies in the Minnesota MPCA SSTS licensed business registry are based in Saint Louis County as of 2026-07-23. Companies based elsewhere in Minnesota also commonly serve the county.
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