| Company | Location | Certifications | License # |
|---|---|---|---|
| All Septic Llc | Mullins, SC | Installer (Tier 2) | OSWWI0497 |
| Brigman | Marion, SC | Installer (Tier 2) | OSWWI0539 |
| Charles Codey Foley | Mullins, SC | Installer (Tier 2) | OSWWI0525 |
| Diversified Llc | Britton'S Neck, SC | Pumper | 33-368-33004 |
| Diversified Of Britton'S Neck Llc | Brittons Neck, SC | Installer (Tier 2) | OSWWI0128 |
| Josh S/T Pump Clean Svc | Mullins, SC | Pumper | 33-368-33003 |
6 companies in the SCDES on-site wastewater (OSWW) contractor registry are based in Marion County as of 2026-07-23. Companies based elsewhere in South Carolina also commonly serve the county.
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