| Company | Location | Certifications | License # |
|---|---|---|---|
| All Weather Ground Solutions | Burley, ID | Installer | — |
| Allen Pump Inc. | Hazelton, ID | Installer | — |
| Aslett Construction Company Inc. | Twin Falls, ID | Installer | — |
| B & G Dirt Works LLC | Hailey, ID | Installer | — |
| Bear Necessities Portable Restrooms | Twin Falls, ID | Pumper | — |
| Bigg's Construction | Twin Falls, ID | Installer | — |
| Bigwood Excavation | Hailey, ID | Installer | — |
| Blue Ridge Plumbing & Septic | Burley, ID | InstallerPumper | — |
| Bradley Construction | Hailey, ID | Installer | — |
| Brian Dey Construction | Twin Falls, ID | Installer | — |
| C & L Koehn | Hazelton, ID | Installer | — |
| C M Concrete | Filer, ID | Installer | — |
| C Miller Excavation | Fairfield, ID | Installer | — |
| Crist and Sons Cont Inc. | Wendell, ID | Installer | — |
| Dave's Excavating | Burley, ID | Installer | — |
| Dayley Additions | Burley, ID | Installer | — |
| Done-Right Contracting | Burley, ID | Installer | — |
| Doug Weaver Construction | Buhl, ID | Installer | — |
| Dry Creek Land Improvements LLC | Carey, ID | Installer | — |
| Free Fall Construction LLC | Twin Falls, ID | Installer | — |
| Gnesa Excavating Inc. | Gooding, ID | Installer | — |
| Idaho Creek Construction | Hagerman, ID | Installer | — |
| Jones Construction | Gooding, ID | Installer | — |
| JST Construction Inc. | Wendell, ID | Installer | — |
| Links Dig 4 U LLC | Wendell, ID | Installer | — |
| Loosli Excavating Inc. | Twin Falls, ID | Installer | — |
| Miller Excavation | Declo, ID | Installer | — |
| Pappas Pumping & Septic Services LLC | Hailey, ID | Installer | — |
| Paul Benko Construction | Gooding, ID | Installer | — |
| Pierson Construction Inc. | Gooding, ID | Installer | — |
| Red Barn Plumbing LLC DBA Roto - Rooter | Twin Falls, ID | Installer | — |
| Ridley Livestock | Buhl, ID | Installer | — |
| Rixon Excavation | Hailey, ID | Installer | — |
| SC Construction and Property Maintenance | Filer, ID | Installer | — |
| Skyline Excavation and Grading LLC | Hailey, ID | Installer | — |
| Sliman & Butler Irrigation | Gooding, ID | Installer | — |
| Superior Sewer and Drain | Hansen, ID | Installer | — |
| Tim Smalley Construction | Buhl, ID | Installer | — |
| Trask Construction Inc. | Hailey, ID | Installer | — |
| Trinity Mountain Excavators LLC | Fairfield, ID | Installer | — |
| Triple J Excavation | Wendell, ID | Installer | — |
| Waters Plumbing & Heating | Burley, ID | Installer | — |
| Web Inc. DBA Western Septic & Excavation | Buhl, ID | Installer | — |
| Wizard's Wood Shop | Buhl, ID | Installer | — |
| Worthington Septic Pros | Burley, ID | Installer | — |
45 companies in the Idaho DEQ permitted subsurface sewage disposal system installers and septic tank pumpers are based in Cassia County as of 2026-07-23. Companies based elsewhere in Idaho also commonly serve the county.
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