| Company | Location | Certifications | License # |
|---|---|---|---|
| Cain Backhoe Service | Bennettsville, SC | Installer (Tier 2) | OSWWI0589 |
| Sheppard'S Underground Contractors Inc | Bennettsville, SC | Installer (Tier 2) | OSWWI0239 |
| Sheppards Repair Shop | Bennettsville, SC | Installer (Tier 2) | 34-367-34010 |
| Sheppards Septic Tank | Bennettsville, SC | Pumper | 34-368-34002 |
| Sheppards Underground Contractors Inc. | Bennettsville, SC | Pumper | OSWWP0066 |
| Thomas Blue Construction | Bennettsville, SC | Installer (Tier 2) | 34-367-34035 |
6 companies in the SCDES on-site wastewater (OSWW) contractor registry are based in Marlboro County as of 2026-07-23. Companies based elsewhere in South Carolina also commonly serve the county.
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