| Company | Location | Certifications | License # |
|---|---|---|---|
| Out Back Toilets, Llc | — | Pumper | S-1180 |
| Rainbow Septic Service | — | Pumper | S-879 |
2 companies in the Montana DEQ licensed septic pumpers list are based in Lake County as of 2026-07-23. Companies based elsewhere in Montana also commonly serve the county.
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