| Company | Location | Certifications | License # |
|---|---|---|---|
| All American Sept & Pumping Svc | Hartsville, SC | Installer (Tier 2) | 13-367-13075 |
| All American Septic & Pumping Service Inc | Hartsville, SC | Pumper | 13-368-13014 |
| Anderson Plumbing And Industrial, Inc. | Hartsville, SC | Installer (Tier 2) | OSWWI0503 |
| Anderson Plumbing And Industrial, Inc. | Hartsville, SC | Installer (Tier 2) | OSWWI0505 |
| Anderson Plumbing And Industrial, Inc. | Hartsville, SC | Installer (Tier 2) | OSWWI0511 |
| Buster'S Backhoe Svc | Hartsville, SC | Installer (Tier 2) | 16-367-16063 |
| Carolina Earthworks | Darlington, SC | Pumper | 16-368-16022 |
| Cotton Landscaping & S/T | Darlington, SC | Installer (Tier 2) | 16-367-16005 |
| Crowley'S Plumbing Inc | Hartsville, SC | Installer (Tier 2) | 16-367-16007 |
| Cs Septic & Services | Darlington, SC | Installer (Tier 2) | OSWWI0592 |
| Double F Septic Llc | Hartsville, SC | Installer (Tier 1) | OSWWI0471 |
| Driggers Enterprises | Darlington, SC | Installer (Tier 2) | OSWWI0747 |
| Evans Landscaping | Hartsville, SC | Installer (Tier 2) | 16-367-16010 |
| Green Port-A-Jon Service Llc | Florence, SC | Pumper | 16-368-16023 |
| Hb Septic Solutions | Lamar, SC | Installer (Tier 2) | OSWWI0476 |
| Jimmy M Munn Septic Tank Serv | Hartsville, SC | Installer (Tier 2) | 16-367-16021 |
| Jordan Site & Septic Llc | Hartsville, SC | Installer (Tier 1) | OSWWI0742 |
| Sellers Septic Tank Service | Florence, SC | Pumper | 16-368-16010 |
| Smith'S Septic Tank Llc | Lamar, SC | Installer (Tier 2) | 16-367-16027 |
| Smith'S Septic Tank Llc | Lamar, SC | Pumper | 16-368-16008 |
| Wilson Septic Tank Service | Hartsville, SC | Installer (Tier 2) | 16-367-16067 |
| Wilson Septic Tank Service | Hartsville, SC | Pumper | 16-368-16021 |
| X-Works | Hartsville, SC | Installer (Tier 2) | OSWWI0240 |
23 companies in the SCDES on-site wastewater (OSWW) contractor registry are based in Darlington County as of 2026-07-23. Companies based elsewhere in South Carolina also commonly serve the county.
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