| Company | Location | Certifications | License # |
|---|---|---|---|
| 4telney Construction And Trucking Llc | Rainier, OR | Installer | 39879 |
| Bergman Construction Llc | Clatskanie, OR | Installer | 39878 |
| Blue Heron Septic & Drain Service, Inc | Columbia City, OR | Pumper | 38835 |
| Clatskanie Septic Service Llc | Clatskanie, OR | InstallerPumper | 39338 |
| Columbia Septic Services Llc | St. Helens, OR | Pumper | 39808 |
| Don Hooper, Inc. | Clatskanie, OR | Installer | 34811 |
| Earl Scott Pumpouts | Rainier, OR | InstallerPumper | 37412 |
| Hamilton Property Improvement Llc | Clatskanie, OR | Installer | 39677 |
| Hobby Logging & Construction, Inc. | Deer Island, OR | Installer | 38582 |
| Holladay And Sons Llc | Warren, OR | Installer | 39819 |
| Jobin Construction Llc | Scappoose, OR | Installer | 39836 |
| K Schwarz Construction, Inc. | Saint Helens, OR | Installer | 36331 |
| Lonny Brady | Scappoose, OR | Installer | 37036 |
| M. E. Moore Const., Inc. | St. Helens, OR | InstallerPumper | 36411 |
| Makana Trucking And Excavation, Inc | Warren, OR | InstallerPumper | 39193 |
| Mcmullen Water Systems, Inc | Saint Helens, OR | Installer | 38820 |
| Richard J. Louie | St. Helens, OR | Installer | 36607 |
| Robert J. Watts Construction Inc. | Vernonia, OR | Installer | 38649 |
| Schwartz General Contracting Llc | Clatskanie, OR | Installer | 39806 |
| St. Helens Scappoose Septic And Drain Service Inc | St Helens, OR | Pumper | 39883 |
| Under The Sun Llc | Deer Island, OR | Installer | 39861 |
| Waste Connections Of Oregon, Inc., Dba Hudson Portable Toilet Service | St. Helens, OR | Pumper | 35942 |
22 companies in the Oregon DEQ licensed Sewage Disposal Service (SDS) installer & pumper businesses are based in Columbia County as of 2026-07-23. Companies based elsewhere in Oregon also commonly serve the county.
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