| Company | Location | Certifications | License # |
|---|---|---|---|
| Action Jackson Septic Pumping | Ridgeway, SC | Pumper | 20-368-20008 |
| Cohen Construction And Logistics Llc | Winnsboro, SC | Installer (Tier 2) | OSWWI0562 |
| Green Energy Biofuel, Llc | Winnsboro, SC | Pumper | 20-368-20009 |
| Holts Septic Tank Service | Winnsboro, SC | Installer (Tier 2) | 20-367-20006 |
| Holts Septic Tank Service | Winnsboro, SC | Pumper | 20-368-20005 |
| Matthews Brothers Builders Llc | Blackstock, SC | Installer (Tier 2) | 20-367-20045 |
| T-21 Construction And Land Services, Llc | Winnsboro, SC | Installer (Tier 2) | 32-367-32105 |
| Wateree Excavation | Ridgeway, SC | Installer (Tier 2) | 20-367-20034 |
| Willingham Land & Asphalt | Jenkinsville, SC | Installer (Tier 2) | 20-367-20025 |
| Willingham Landscape & Asphalt | Jenkinsville, SC | Pumper | 20-368-20007 |
10 companies in the SCDES on-site wastewater (OSWW) contractor registry are based in Fairfield County as of 2026-07-23. Companies based elsewhere in South Carolina also commonly serve the county.
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