| Company | Location | Certifications | License # |
|---|---|---|---|
| Boykin And Son | Greeleyville, SC | Installer (Tier 2) | 45-367-45013 |
| Boykin And Son | Greeleyville, SC | Pumper | 45-368-45007 |
| Britton Brothers Llc | Kingstree, SC | Installer (Tier 2) | OSWWI0483 |
| Britton Brothers Llc | Kingstree, SC | Installer (Tier 2) | OSWWI0769 |
| Buster Scott | Hemingway, SC | Installer (Tier 2) | OSWWI0779 |
| Cooper & Sons Septic Tank Svc | Hemingway, SC | Pumper | 45-368-45006 |
| Edward D. Mitchum Sr Llc | Andrews, SC | Installer (Tier 1) | OSWWI0700 |
| John'S Farm Service | Lake City, SC | Installer (Tier 2) | 45-367-45028 |
| Low Country Septic Systems | Hemingway, SC | Installer (Tier 2) | OSWWI0415 |
| Pipeworks Plumbing Llc | Greeleyville, SC | Installer (Tier 2) | OSWWI0106 |
| Skye Construction | Kingstree, SC | Installer (Tier 2) | OSWWI0447 |
| Stac | Hemingway, SC | Installer (Tier 2) | OSWWI0610 |
12 companies in the SCDES on-site wastewater (OSWW) contractor registry are based in Williamsburg County as of 2026-07-23. Companies based elsewhere in South Carolina also commonly serve the county.
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