| Company | Location | Certifications | License # |
|---|---|---|---|
| A & B Construction of MN., Inc | Hugo, MN | Installer | L123 |
| Able Go Green Septic Services Inc. | Forest Lake, MN | DesignerInstallerPumper | L1675 |
| Bartie Construction Inc. | Stillwater, MN | Installer | L4432 |
| Bell Excavating, Inc. | Stillwater, MN | DesignerInstaller | L2406 |
| CK Excavating LLC | Lake Elmo, MN | Installer | L3688 |
| David R. Brown | Woodbury, MN | DesignerInspector | L3649 |
| Fuhr Trenching Inc | Hugo, MN | Installer | L52 |
| John Buelow Excavating LLC | Stillwater, MN | Installer | L389 |
| Kline Brothers Excavating | Stillwater, MN | DesignerInstaller | L869 |
| Libby Construction LLC | Stillwater, MN | Installer | L4009 |
| Meyer Sewer Service, LLC | Hastings, MN | Pumper | L915 |
| Midwest Sewer Services | Grant, MN | Designer (Advanced)Inspector (Advanced)InstallerPumper | L2896 |
| Pinky's Sewer Service Inc. | Afton, MN | Pumper | L4251 |
| Rumpca Companies, Inc. | Saint Paul Park, MN | Installer | L4144 |
| Rumpca Companies, Inc. | Saint Paul Park, MN | Installer | L835 |
| Saint Croix Sewer Service, Inc. | Hastings, MN | DesignerInstaller | L3977 |
| Smilie's Sewer Service | Scandia, MN | InstallerPumper | L2428 |
| SS Septic Solutions LLC | Hastings, MN | DesignerInspectorInstaller | L4137 |
| Wagner Septic & Excavating LLC | Forest Lake, MN | Installer | L4345 |
19 companies in the Minnesota MPCA SSTS licensed business registry are based in Washington County as of 2026-07-23. Companies based elsewhere in Minnesota also commonly serve the county.
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