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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| Dagan Murray | Bristol, VT | — | Designer | — |
| Daniel Carter | Corinth, VT | — | Designer | — |
| Daniel Machell | Manchester Center, VT | — | Designer | — |
| Daniel Meeden | Burlington, VT | — | Designer | — |
| Daniel Monette | Cornish, NH | — | Designer | — |
| Daniel Normandeau | Dummerston, VT | — | Designer | — |
| Daniel Patenaude | Hingham, MA | — | Designer | — |
| Daniel Pepin Dba Dan Pepin Excavating And Trucking | Newport, VT | — | Septage Hauler | 1110 |
| Darren Pion Dba D Pion Transport | Lowell, VT | — | Septage Hauler | 2712 |
| Darrin Lary | Harrison, ME | — | Designer | — |
| Darryl Calkins | Hartland, VT | — | Designer | — |
| David Allerton | Saint Albans, VT | — | Designer | — |
| David Frothingham | Waterbury Center, VT | — | Designer | — |
| David Hindinger | Perkinsville, VT | — | Designer | — |
| David Marshall | Hinesburg, VT | — | Designer | — |
| David Ring | Morrisville, VT | — | Designer | — |
| David Tudhope | Burlington, VT | — | Designer | — |
| David VanGuilder | North Clarendon, VT | — | Designer | — |
| David Webb | Montpelier, VT | — | Designer | — |
| Delmolino & Sons, Inc. | Cheshire, MA | — | Septage Hauler | 1067 |
| Denise Johnson Terk | N. Ferrisburgh, VT | — | Designer | — |
| Derek Bevins | Barre, VT | — | Designer | — |
| Derek Thibodeau | Richmond, VT | — | Designer | — |
| Derick Read | Colchester, VT | — | Designer | — |
| Diversified Brokerage & Logistics Of Ne, Llc | Derry, NH | — | Septage Hauler | 2540 |
| Donald D. Dorr Septic Service Inc. | Manchester Center, VT | — | Septage Hauler | 143 |
| Donald Gallus | Wallingford, VT | — | Designer | — |
| Donald Hettrick | Wardsboro, VT | — | Designer | — |
| Donovan Ward | Waterbury, VT | — | Designer | — |
| Doran Bros., Inc. | Fair Haven, VT | — | Septage Hauler | 142 |
| Double Green Circle, Inc. | Guilford, CT | — | Septage Hauler | 960 |
| Douglas Bonneau | Lowell, VT | — | Designer | — |
| Douglas Goulette | Williston, VT | — | Designer | — |
| Douglas Hewitt | South Burlington, VT | — | Designer | — |
| Dr Robinson, Llc Dba B&B Septic | St. Johnsbury, VT | — | Septage Hauler | 40 |
| Dundon Plumbing & Heating Inc. | Orwell, VT | — | Septage Hauler | 151 |
| Dustin Glidden Dba Abbott Septic Service | Charlestown, NH | — | Septage Hauler | 2145 |
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