| Company | Location | Certifications | License # |
|---|---|---|---|
| Ac Groundworks | Sumter, SC | Installer (Tier 2) | OSWWI0639 |
| Andrew Hodge | Sumter, SC | Installer (Tier 2) | OSWWI0284 |
| Barwick Plumbing | Pinewood, SC | Installer (Tier 2) | 14-367-14001 |
| Brunson'S Septic Tanks | Sumter, SC | Pumper | 43-368-43028 |
| Charles Smith Company | Sumter, SC | Installer (Tier 2) | OSWWI0426 |
| Daughrity & Sons Plumbing Llc | Sumter, SC | Installer (Tier 2) | 43-367-43077 |
| Ecr Construction, Llc | Sumter, SC | Installer (Tier 2) | 43-367-43071 |
| Hill Plumbing & Electric Inc | Sumter, SC | Installer (Tier 2) | 43-367-43008 |
| J.F. Contractors Llc | Sumter, SC | Installer (Tier 2) | 43-367-43076 |
| James Aaron Dyson Construction | Sumter, SC | Installer (Tier 2) | 43-367-43079 |
| Joe Singleton Company Inc | Sumter, SC | Installer (Tier 2) | 43-367-43078 |
| Lasseigne Grading & Excavation | Sumter, SC | Installer (Tier 2) | OSWWI0702 |
| My Guys Construction And Demolition, Llc | Rembert, SC | Installer (Tier 2) | OSWWI0710 |
| Prescott Construction | Sumter, SC | Installer (Tier 2) | OSWWI0211 |
| Ramsey'S Septic Tank | Dalzell, SC | Pumper | 43-368-43013 |
| Rays Septic Tank Pumping & Ser | Sumter, SC | Pumper | 43-368-43018 |
| Rourk Plumbing Llc | Sumter, SC | Installer (Tier 2) | 43-367-43063 |
| T & N Septic Tank Co Inc | Sumter, SC | Pumper | 43-368-43005 |
| Tco Construction Inc | Sumter, SC | Installer (Tier 2) | OSWWI0686 |
| Thames Septic Service | Sumter, SC | Pumper | 43-368-43027 |
| Tidwell Septic Tanks Inc | Sumter, SC | Pumper | 43-368-43015 |
| Tidwell Septic Tanks, Inc. | Sumter, SC | Installer (Tier 2) | 43-367-43023 |
| Tlcco Thames Lawn Care, Pressure Washing & Septic Service | Sumter, SC | Installer (Tier 2) | 43-367-43073 |
| Wilson Septic Tank | Sumter, SC | Installer (Tier 2) | 43-367-43075 |
| Wtw Services | Sumter, SC | Installer (Tier 2) | OSWWI0212 |
25 companies in the SCDES on-site wastewater (OSWW) contractor registry are based in Sumter County as of 2026-07-23. Companies based elsewhere in South Carolina also commonly serve the county.
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