| Company | Location | Certifications | License # |
|---|---|---|---|
| Arod Enterprises, Inc | The Dalles, OR | Installer | 39153 |
| Columbia River Affordable Portables, Llc | The Dalles, OR | Pumper | 38923 |
| Cougar Excavation, Llc | Tygh Valley, OR | Installer | 38261 |
| Crestline Construction Company Llc | The Dalles, NJ | Installer | 39788 |
| Danny T. And Mary Beth Richman, Dba Mbr Construction | The Dalles, OR | Installer | 38002 |
| Delco Excavation, Llc | Tygh Valley, OR | Installer | 38758 |
| General Excavation, Llc, Dba General Excavation,Llc | Dufur, OR | Installer | 38145 |
| Genesis Septic Solutions, Llc | The Dalles, OR | InstallerPumper | 39229 |
| Gregrey C. O'Neal, Dba Gregrey C. O'Neal Woodworking | Maupin, OR | Installer | 39405 |
| Shearer Worx Llc | The Dalles, OR | Installer | 39896 |
| Stan Cooper, Dba Little Rock Construction | Tygh Valley, OR | Installer | 37540 |
| Tom Olson Trucking, Llc, Dba Olson Excavating | Dufur, OR | Installer | 38896 |
12 companies in the Oregon DEQ licensed Sewage Disposal Service (SDS) installer & pumper businesses are based in Wasco County as of 2026-07-23. Companies based elsewhere in Oregon also commonly serve the county.
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