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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| D H Keene Septic Svs, Inc | Blackstone, MA | — | Septage Hauler | 304 |
| Dana A Ralph | North Attleboro, MA | — | Installer | L1233 |
| Daniel C Sleboda | Smithfield, RI | — | Installer | L1594 |
| Daniel C Sleboda Jr. | Smithfield, RI | — | Installer | L1816 |
| Daniel DuBreuil | Cumberland, RI | — | Installer | L0973 |
| Daniel E Marcotte | North Smithfield, RI | — | Designer (Class I) | D1297 |
| Daniel E Marcotte | North Smithfield, RI | — | Installer | L1879 |
| Daniel F Harrington, III | Hope Valley, RI | — | Designer (Class II) | D2064 |
| Daniel H Keene | North Smithfield, RI | — | Designer (Class I) | D1026 |
| Daniel H Keene | North Smithfield, RI | — | Installer | L1144 |
| Daniel Houle | North Scituate, RI | — | Installer | L0222 |
| Daniel L Longley | North Kingstown, RI | — | Installer | L1100 |
| Daniel L Roberge | Newport, RI | — | Installer | L1885 |
| Daniel P Joubert Jr | Westerly, RI | — | Designer (Class III) | D3162 |
| Daniel P Joubert Jr | Westerly, RI | — | Designer (Class IV Soil Evaluator) | D4092 |
| Daniel P Joubert Jr. | Westerly, RI | — | Installer | L1791 |
| Daniel P Woods | Portsmouth, RI | — | Installer | L1845 |
| Daniel R Campbell | Plainville, MA | — | Designer (Class III) | D3095 |
| Daniel R Cotta | Exeter, RI | — | Designer (Class III) | D3029 |
| Daniel R Ray | Cumberland, RI | — | Installer | L1629 |
| Daniel W Konuch | Coventry, RI | — | Installer | L1117 |
| Daniel W Patterson | Exeter, RI | — | Designer (Class I) | D1037 |
| Daniel W Patterson | Exeter, RI | — | Installer | L0818 |
| Darlene M Gardner | Saunderstown, RI | — | Designer (Class I) | D1151 |
| Darlene M Gardner | Saunderstown, RI | — | Installer | L1397 |
| Darren P Hayward | Norwich, CT | — | Designer (Class III) | D3137 |
| David A Allen | Exeter, RI | — | Designer (Class I) | D1163 |
| David A Allen | Exeter, RI | — | Installer | L1386 |
| David A Johnson | Wakefield, RI | — | Designer (Class I) | D1314 |
| David A Johnson | Wakefield, RI | — | Installer | L1887 |
| David A King | North Kingstown, RI | — | Installer | L2041 |
| David A Medeiros | Dartmouth, MA | — | Installer | L1745 |
| David A Russo | Cranston, RI | — | Designer (Class III) | D3125 |
| David B Carnevale | Chepachet, RI | — | Installer | L1084 |
| David B Dow | Cumberland, RI | — | Designer (Class I) | D1014 |
| David B Dow | Cumberland, RI | — | Designer (Class IV Soil Evaluator) | D4037 |
| David B Dow | Cumberland, RI | — | Installer | L1314 |
| David Benn | Bradford, RI | — | Installer | L0679 |
| David C Duranleau | Warwick, RI | — | Designer (Class IV Soil Evaluator) | D4048 |
| David Cabral | Westport, MA | — | Installer | L1371 |
| David D Gardner | Narragansett, RI | — | Designer (Class II) | D2006 |
| David D Gardner | Narragansett, RI | — | Designer (Class IV Soil Evaluator) | D4050 |
| David D Morrocco | Johnston, RI | — | Installer | L1880 |
| David E Henrici | Salem, CT | — | Installer | L1021 |
| David E Provonsil | North Scituate, RI | — | Designer (Class III) | D3160 |
| David G Flynn | Attleboro, MA | — | Installer | L1898 |
| David H Merriam | Warwick, RI | — | Installer | L0658 |
| David J Cluley | East Greenwich, RI | — | Designer (Class III) | D3085 |
| David J Skurka | West Warwick, RI | — | Designer (Class I) | D1077 |
| David J Skurka | West Warwick, RI | — | Installer | L0615 |
| David J Zygiel Jr. | Portsmouth, RI | — | Designer (Class I) | D1267 |
| David J Zygiel Jr. | Portsmouth, RI | — | Installer | L1804 |
| David K Manoni | South Kingstown, RI | — | Designer (Class III) | D3132 |
| David K Manoni | South Kingstown, RI | — | Designer (Class IV Soil Evaluator) | D4086 |
| David Kalen | Wakefield, RI | — | Designer (Class IV Soil Evaluator) | D4052 |
| David Kehew | Portsmouth, RI | — | Installer | L0841 |
| David L Potter | Lincoln, RI | — | Designer (Class III) | D3120 |
| David L Sisson | Tiverton, RI | — | Installer | L1725 |
| David L Skaggs | Exeter, RI | — | Installer | L1829 |
| David L Towle | Cumberland, RI | — | Installer | L1910 |
| David M Rose | Kingston, RI | — | Installer | L0993 |
| David O'Keefe | Burriville, RI | — | Installer | L0569 |
| David P Coppola | South Kingstown, RI | — | Installer | L1601 |
| David Quintal | Tiverton, RI | — | Installer | L1954 |
| David W Fish | Wakefield, RI | — | Designer (Class III) | D3165 |
| Dean Antonelli | Johnston, RI | — | Installer | L1537 |
| Dean M Prendergast | Portsmouth, RI | — | Designer (Class I) | D1223 |
| Dean M Prendergast | Portsmouth, RI | — | Installer | L1405 |
| Deborah L Bosworth | Warwick, RI | — | Designer (Class IV Soil Evaluator) | D4032 |
| Deborah L Sherman-Quigley | Wakefield, RI | — | Installer | L0788 |
| Debra Zarrella | Exeter, RI | — | Installer | L1284 |
| Demetno P Costa | New Bedford, MA | — | Installer | L1649 |
| Dennis J Diffley Jr. | Warwick, RI | — | Installer | L1327 |
| Dennis W Wood | North Scituate, RI | — | Installer | L1637 |
| Derek Andrade | Tiverton, RI | — | Installer | L2033 |
| Diffley And Daughters | West Greenwich, RI | — | Septage Hauler | 836 |
| Donald A Roberts | Coventry, RI | — | Installer | L1869 |
| Donald F Spencer | Westerly, RI | — | Installer | L0918 |
| Donald G Gordon | Narraganseet, RI | — | Installer | L1019 |
| Donald Gliottone | North Providence, RI | — | Designer (Class I) | D1280 |
| Donald Gliottone | North Providence, RI | — | Installer | L0566 |
| Donald J Medeiros | Little Compton, RI | — | Designer (Class III) | D3140 |
| Donald J Medeiros | Little Compton, RI | — | Designer (Class IV Soil Evaluator) | D4035 |
| Donald J St.Ours | Dighton, MA | — | Installer | L1517 |
| Donald L Knox | Foster, RI | — | Installer | L0013 |
| Donald P Berndt | Attleboro,, MA | — | Installer | L0684 |
| Douglas J Allam Jr. | Warwick, RI | — | Designer (Class III) | D3152 |
| Duane C Boucher | Woonsocket, RI | — | Installer | L1849 |
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