| Company | Location | Certifications | License # |
|---|---|---|---|
| Allen Paul Trucking | Lenore, ID | Installer | — |
| Beller Construction | Lewiston, ID | Installer | — |
| Boulder Creek Outfitters | Peck, ID | Installer | — |
| Brian Mcdermott Construction | Lewiston, ID | Installer | — |
| Caimi Excavation LLC | Lewiston, ID | Installer | — |
| Clearwater Excavating LLC | Lewiston, ID | Installer | — |
| Curry Inc. | Lewiston, ID | Installer | — |
| D&D Mclaughlin | Lapwai, ID | Installer | — |
| Giese Paving & Excavation, InC. | Lewiston, ID | Installer | — |
| J Russell Excavation & Concrete LLC | Culdesac, ID | Installer | — |
| Johns Excavation & Landscaping LLC | Lewiston, ID | Installer | — |
| Jones Excavation LLC | Lewiston, ID | Installer | — |
| M. L. Albright & Sons, InC. | Lewiston, ID | Installer | — |
| Mark Regan Construction LLC | Lenore, ID | Installer | — |
| Pilot Excavating | Peck, ID | Installer | — |
| Roto Rooter | Lewiston, ID | Installer | — |
| Terry Construction | Lapwai, ID | Installer | — |
| Todd Family Rentals LLC, Oba Market Ready Pros | Lenore, ID | Installer | — |
| West Tech Industries, LLC | Lewiston, ID | Installer | — |
19 companies in the Idaho DEQ permitted subsurface sewage disposal system installers and septic tank pumpers are based in Nez Perce County as of 2026-07-23. Companies based elsewhere in Idaho also commonly serve the county.
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