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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| W & W Construction | Pontotoc, MS | — | Installer | — |
| W & W Plumbing & Heating Inc | Sibley, MS | — | Installer | — |
| W. D Jones Cabinet Products | Pachuta, MS | — | Installer | — |
| W. G. Harrell Construction | Booneville, MS | — | Installer | — |
| W. Peek Construction Llc | Caledonia, MS | — | Installer | — |
| W.R. Services | Waynesboro, MS | — | Installer | — |
| W2 Land And Septic Llc | Pelahatchie, MS | — | Installer | — |
| Wade'S Plumbing | Starkville, MS | — | Installer | — |
| Walker Septic & Backhoe | Wiggins, MS | — | Installer | — |
| Walter'S Septic | Laurel, MS | — | Pumper | — |
| Walters Septic & Backhoe Service | Laurel, MS | — | Installer | — |
| Walton Construction Llc | Coahoma, MS | — | Installer | — |
| Ward Contracting Llc | Pontotoc, MS | — | Installer | — |
| Ward Management, Llc | Foxworth, MS | — | Installer | — |
| Wardens Septic | Picayune, MS | — | Installer | — |
| Warren'S Backhoe & Dozier | Philadephia, MS | — | Installer | — |
| Waste Pro | Ocean Springs, MS | — | Pumper | — |
| Waste Pro Usa | Columbus, MS | — | Pumper | — |
| Wastewater Control, Inc | Florence, MS | — | InstallerPumper | — |
| We Pump Co. | Columbus, MS | — | Pumper | — |
| Weaver Septic Systems | Walls, MS | — | Installer | — |
| Webbs Septic Service | Saltillo, MS | — | Installer | — |
| Weldon Rogers | Leaksville, MS | — | Installer | — |
| Wells Septic Installation, Llc | Columbia, MS | — | Installer | — |
| Wes The Plumber | Soso, MS | — | Installer | — |
| West Hill Dirt Work | Laurel, MS | — | Installer | — |
| Whatley'S Septic Service | Mccomb, MS | — | Installer | — |
| White Septic & Backhoe, Llc | Columbus, MS | — | Installer | — |
| Wicker Building Supply, Inc | Summit, MS | — | Pumper | — |
| Wilbanks Wee-Con-Du-It Electric Inc | Corinth, MS | — | Installer | — |
| Wilcher'S Septic Tank Cleaning | Philadelphia, MS | — | InstallerPumper | — |
| Wildewood Treatment Sytems And Wastewater Llc | Vaughan, MS | — | Installer | — |
| Wilkerson'S Dirt And Grav | Greenville, MS | — | Installer | — |
| William Daughdril | Lumberton, MS | — | Installer | — |
| William Daughdrill | Lumberton, MS | — | Installer | — |
| Williams Dirt Work | Clarksdale, MS | — | Installer | — |
| Williamson Backhoe | Hattiesburg, MS | — | Installer | — |
| Wilson Septic Tank Service | Meridian, MS | — | InstallerPumper | — |
| Wilson Septic Tank Service, Llc | Meridian, MS | — | Pumper | — |
| Winfred Allen Construction | Holly Springs, MS | — | Installer | — |
| Wishart Services Llc | Summit, MS | — | Installer | — |
| Womble'S Backhoe & Dozer | Water Valley, MS | — | Installer | — |
| Wood Legacy Developments, Llc | Belmont, MS | — | Installer | — |
| Woody'S Welding & Repair Service | Bentonia, MS | — | Installer | — |
| Wooten Construction | Dennis, MS | — | Installer | — |
| Wooten Services Llc | Saltillo, MS | — | Installer | — |
| Wortham Construction | Oxford, MS | — | Installer | — |
| Wren Hauling Service | Shannon, MS | — | Installer | — |
| Wright Plumbing Llc | Philadelphia, MS | — | Installer | — |
| Wte Labortories, Llc | Canton, MS | — | Installer | — |
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