| Company | Location | Certifications | License # |
|---|---|---|---|
| Berry Homescapes DBA Custer Septic | Challis, ID | Pumper | — |
| Chester Plumbing & Htg Inc | Challis, ID | Installer | — |
| Getty Excavating Inc | Challis, ID | Installer | — |
| I Bar Ranch LLC / A&B Excavation | Challis, ID | Installer | — |
| Iver Strand Construction | Challis, ID | Installer | — |
| Smithers Excavation | Challis, ID | Installer | — |
6 companies in the Idaho DEQ permitted subsurface sewage disposal system installers and septic tank pumpers are based in Custer County as of 2026-07-23. Companies based elsewhere in Idaho also commonly serve the county.
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