| Company | Location | Certifications | License # |
|---|---|---|---|
| Cbg Inc | Gaston, SC | Installer (Tier 2) | 09-367-09021 |
| Cox Earthworks | Orangeburg, SC | Installer (Tier 2) | OSWWI0588 |
| Crosby Backhoe & Bushogging | St Matthews, SC | Installer (Tier 2) | 09-367-09022 |
| Longleaf Property Solutions, Llc | St Matthews, SC | Installer (Tier 2) | OSWWI0567 |
| Low Country Land Improvements | Elloree, SC | Installer (Tier 2) | OSWWI0665 |
| Richard Hall | St Matthews, SC | Installer (Tier 2) | 37-367-37226 |
| Shawn'S Septic Tank | Saint Matthews, SC | Installer (Tier 2) | 09-367-09020 |
| T. W. Riley Constr., Inc. | St Matthews, SC | Installer (Tier 2) | OSWWI0544 |
| Travis Prevatte | Gaston, SC | Installer (Tier 2) | 09-367-09017 |
9 companies in the SCDES on-site wastewater (OSWW) contractor registry are based in Calhoun County as of 2026-07-23. Companies based elsewhere in South Carolina also commonly serve the county.
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