| Company | Location | Certifications | License # |
|---|---|---|---|
| Aheron Mountain Homes | Limestone, TN | Installer | 14369 |
| AK Rice | Jonesborough, TN | Installer (Type C) | 1080 |
| Ar Construction | Telford, TN | Installer (Type C) | 13763 |
| Barkley Lumber Company, Inc. | Limestone, TN | Installer (Type C) | 1609 |
| Blue Ridge Excavating | Johnson City, TN | Installer | 11056 |
| Bradshaw Construction | Gray, TN | Installer (Type C) | 1601 |
| David Salts Plumbing | Johnson City, TN | Installer (Type C) | 13725 |
| Dba Mueller Master Builders | Kingsport, TN | Installer (Type C) | 13281 |
| Dunn Excavating | Limestone, TN | Installer (Type C) | 10119 |
| Ed Gouge Construction | Jonesborough, TN | Installer (Type C) | 11259 |
| Harrison Hartman Grading and Excavating | Jonesborough, TN | Installer | 14367 |
| Heath Broyles | Jonesborough, TN | Installer (Type C) | 13163 |
| Hm Building And Renovations, Llc | Johnson City, TN | Installer (Type C) | 13602 |
| Hometown Plumbing Inc | Johnson City, TN | Installer (Type C) | 14080 |
| Jason Day Construction | Jonesborough, TN | Installer | 18326 |
| Lakeview Plumbing | Gray, TN | Installer (Type C) | 12632 |
| Mak Septic Service | Kingsport, TN | Pumper | 172 |
| Mike Little Excavation | Johnson City, TN | Installer (Type C) | 1016 |
| OWNER OPERATOR (per TDEC Form entry) | Fall Branch, TN | Installer (Type C) | 18203 |
| Ramsey Construction | Jonesborough, TN | Installer (Type C) | 114 |
| Riggleman Construction | Jonestown, TN | Installer (Type C) | 11974 |
| S&W Construction and Excavation Services | Jonesoborough, TN | Installer (Type C) | 11932 |
| Scott Hill Excavation | Fall Branch, TN | Installer | 11051 |
| Stoots Backhoe | Jonesborough, TN | Installer (Type C) | 783 |
| W.G. Cox Backhoe & Construction | Jonesborough, TN | Installer (Type C) | 1636 |
25 companies in the TDEC active septic system installers & pumpers lists are based in Washington County as of 2026-07-23. Companies based elsewhere in Tennessee also commonly serve the county.
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