| Company | Location | Certifications | License # |
|---|---|---|---|
| Bob'S Valley Service Inc | — | Pumper | S-1046 |
| Cowboy Septic Service | — | Pumper | S-1092 |
| Helena Septic, Llc | — | Pumper | S-1182 |
| Jungers Resources Llc | — | Pumper | S-1156 |
| Lincoln Sewer District | — | Pumper | S-873 |
| Little Johns Portables & Septic Service, Llc | — | Pumper | S-1148 |
| Rocky Mountain Septic Services Llc | — | Pumper | S-1181 |
| Sonny'S Septic Tank Cleaning Service, Llc | — | Pumper | S-1074 |
| T Bench Llc | — | Pumper | S-1206 |
9 companies in the Montana DEQ licensed septic pumpers list are based in Lewis And Clark County as of 2026-07-23. Companies based elsewhere in Montana also commonly serve the county.
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