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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| D & D Pumping | Grenada, MS | — | Pumper | — |
| D & H Enterprises, Llc | Vancleave, MS | — | Installer | — |
| D & J Dirtwork And Septic Tank Installation | Prairie, MS | — | Installer | — |
| D & M Septic | Lucedale, MS | — | Pumper | — |
| D & M Septic Systems | Lucedale, MS | — | Installer | — |
| D And D Pumping Services | Grenada, MS | — | Installer | — |
| D3 Landworks | State Line, MS | — | Installer | — |
| Dan Ray Construction ,Co., Inc | Long Beach, MS | — | Installer | — |
| Danny Miller Plumbing, Inc | Gulfport, MS | — | Pumper | — |
| David Marshall | Philadelphia, MS | — | Installer | — |
| David Marshall Septic System, Llc | Philadelphia, MS | — | Pumper | — |
| Davidson Backhoe Service | Guntown, MS | — | Installer | — |
| Davidson Digging Service | Florence, MS | — | Installer | — |
| Davis Hardware | Leaksville, MS | — | Installer | — |
| Davis Septic And Drain | Coldwater, MS | — | Pumper | — |
| Davis, William C | Eupora, MS | — | Installer | — |
| Dawson Hauling | Bolton, MS | — | InstallerPumper | — |
| Dedeaux, Aaron | Lumberton, MS | — | Installer | — |
| Deep South Septic, Llc | Leakesville, MS | — | Pumper | — |
| Demetrius Randle Excavation Service | Lexington, MS | — | Installer | — |
| Desoto Concrete Products | Olive Branch, MS | — | Installer | — |
| Dice Company | Glen, MS | — | Installer | — |
| Dier'S Vacuum Service | Crystal Springs, MS | — | Pumper | — |
| Dier'S Vacuum Truck Service | Byram, MS | — | InstallerPumper | — |
| Dillon Plumbing Co Inc. | Hattiesburg, MS | — | Installer | — |
| Dirty Deeds Septic Service | Monticello, MS | — | Pumper | — |
| Dirty Dollars Construction Llc | Batesville, MS | — | Installer | — |
| Dirty Worx | Tishomingo, MS | — | Installer | — |
| Discount Services Llc | Hattiesburg, MS | — | Installer | — |
| Diversified Digging Service | Leland, MS | — | Installer | — |
| Dk Manufacturing | Michie, TN | — | Installer | — |
| Dlux Pools Llc | Citronelle, AL | — | Installer | — |
| Dmc Pumping Llc | Florence, MS | — | Pumper | — |
| Dna Underground, Llc | Gulfport, MS | — | Installer | — |
| Do It Right Mechanical | Starkville, MS | — | Installer | — |
| Doc'S Tree And Dirt Service | Starkville, MS | — | Installer | — |
| Don'S Septic | Mclain, MS | — | Pumper | — |
| Dontrell Hall Plumbing | Batesville, MS | — | Installer | — |
| Dorsey Pump & Lawn | Flora, MS | — | InstallerInspector | — |
| Double D Digging & Septic Systme | Mantachie, MS | — | Installer | — |
| Double J & K Equipment Rental, Llc | Carthage, MS | — | Pumper | — |
| Double J & K Equipment Rentals, Llc | Carthage, TX | — | Pumper | — |
| Douglas & Frank Davis | Coldwater, MS | — | Installer | — |
| Douglas Brothers Construction | Moorhead, MS | — | Installer | — |
| Dowdle & Powell Heating, Air & Plumbing, Llc | Senatobia, MS | — | Installer | — |
| Downs Plumbing Services Llc | Carrollton, MS | — | Installer | — |
| Drop It | Ridgeland, MS | — | Pumper | — |
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