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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| Macamaux Septic | Wyoming, RI | — | Septage Hauler | 901 |
| Manuel Alexandre | Westport, MA | — | Installer | L1243 |
| Marc Desrosiers | Coventry, RI | — | Installer | L1941 |
| Marc F Weller | Providence, RI | — | Designer (Class III) | D3129 |
| Marc N Nyberg | North Smithfield, RI | — | Designer (Class II) | D2033 |
| Marc N Nyberg | North Smithfield, RI | — | Designer (Class IV Soil Evaluator) | D4043 |
| Marcus Channell | Warwick, RI | — | Designer (Class II) | D2109 |
| Marianne I Diffin | Inc. Cranston, RI | — | Designer (Class IV Soil Evaluator) | D4093 |
| Mark A DeMello | Portsmouth, RI | — | Installer | L1607 |
| Mark A Rodrigues | Fall River, MA | — | Designer (Class III) | D3133 |
| Mark Brayman | Exeter, RI | — | Installer | L1344 |
| Mark D Boyer | West Warwick, RI | — | Designer (Class II) | D2027 |
| Mark F Pike | Warwick, RI | — | Installer | L1272 |
| Mark H Robar | Richmond, RI | — | Installer | L1582 |
| Mark J Meyers | Oakdale, CT | — | Installer | L1936 |
| Mark L Dowdell | Charlestown, RI | — | Designer (Class III) | D3142 |
| Mark M Dutilly | Greene, RI | — | Installer | L1395 |
| Mark N Ready | Charlestown, RI | — | Installer | L1721 |
| Mark P Mariano | Seekonk, MA | — | Designer (Class III) | D3166 |
| Maryellen Chaffin | Toilets Portsmouth, RI | — | Installer | L2052 |
| Masoud Shakoori | Wyoming, RI | — | Installer | L1381 |
| Mathew J Callahan | West Greenwich, RI | — | Designer (Class I) | D1295 |
| Mathew J Callahan | West Greenwich, RI | — | Installer | L1930 |
| Mathew J Dowling | Charlestown, RI | — | Designer (Class I) | D1269 |
| Mathew J Dowling | Charlestown, RI | — | Designer (Class IV Soil Evaluator) | D4088 |
| Mathew J Dowling | Charlestown, RI | — | Installer | L1805 |
| Mathew N Osborne | Blackstone, MA | — | Designer (Class I) | D1296 |
| Mathew N Osborne | Blackstone, MA | — | Installer | L1881 |
| Matthew A DeJesus | Johnston, RI | — | Installer | L2034 |
| Matthew A Yanuskiewicz | Pawtucket, RI | — | Designer (Class III) | D3164 |
| Matthew B Schartner | North Kingstown, RI | — | Installer | L1634 |
| Matthew E Clukies | Portsmouth, RI | — | Installer | L1521 |
| Matthew E Hackman | Warwick Inc., RI | — | Designer (Class III) | D3061 |
| Matthew J Cotta | Exeter, RI | — | Designer (Class II) | D2117 |
| Matthew J Cotta | Exeter, RI | — | Designer (Class IV Soil Evaluator) | D4044 |
| Matthew J Viana | Warwick, RI | — | Designer (Class III) | D3151 |
| Matthew P Mello | Tiverton, RI | — | Installer | L1960 |
| Matthew R Olson | Portsmouth, RI | — | Installer | L0642 |
| Mcvac Environmental | New Haven, CT | — | Septage Hauler | 678 |
| Melaney L Collins | Westerly, RI | — | Installer | L1968 |
| Michael A DelRossi | Charlestown, RI | — | Designer (Class III) | D3038 |
| Michael A Dillon | Cumberland, RI | — | Installer | L1948 |
| Michael A Dobridnia | Pawtucket, RI | — | Installer | L1182 |
| Michael A Fontaine | South Kingstown, RI | — | Designer (Class II) | D2139 |
| Michael A James | Tiverton, RI | — | Designer (Class III) | D3112 |
| Michael A Morrone | Westely, RI | — | Installer | L1376 |
| Michael A Netro | Inc North Kingstown, RI | — | Installer | L1362 |
| Michael Biszko | Fall River, MA | — | Installer | L1874 |
| Michael C Gray | Chepachet, RI | — | Designer (Class III) | D3148 |
| Michael C Houle | North Scituate, RI | — | Installer | L1713 |
| Michael Costa | Seekonk, MA | — | Installer | L1914 |
| Michael D Cesaro | North Kingstown, RI | — | Installer | L1002 |
| Michael D D'Ambra | Warwick, RI | — | Installer | L1210 |
| Michael D Ernst | Block Island, RI | — | Installer | L1498 |
| Michael DaPonte | Bristol, RI | — | Installer | L0866 |
| Michael E Galligan | Rehoboth, MA | — | Installer | L1761 |
| Michael E Russell | & Consulting, Portsmouth LLC, RI | — | Designer (Class III) | D3106 |
| Michael F Campopiano | Bristol, RI | — | Installer | L0424 |
| Michael F Corcoran | Bradford, CT | — | Installer | L2056 |
| Michael F DePrete | Coventry, RI | — | Installer | L1699 |
| Michael Fonseca | Bristol, RI | — | Installer | L0981 |
| Michael Gadrow | North Kingstown, RI | — | Installer | L0497 |
| Michael H Berek | West Greenwich, RI | — | Designer (Class I) | D1313 |
| Michael H Berek | West Greenwich, RI | — | Installer | L1928 |
| Michael J Interlini Jr. | Johnston, RI | — | Installer | L1899 |
| Michael J Martino | Cranston, RI | — | Installer | L1842 |
| Michael J McCormick | East Greenwich, RI | — | Designer (Class II) | D2100 |
| Michael J Narcisi | Concord, MA | — | Designer (Class IV Soil Evaluator) | D4080 |
| Michael J Wilkinson | Providence, RI | — | Designer (Class III) | D3154 |
| Michael L Simmons | — | — | Installer | L2050 |
| Michael L Sliney | Exeter, RI | — | Designer (Class I) | D1047 |
| Michael L Sliney | Exeter, RI | — | Installer | L1111 |
| Michael Laflamme | Saunderstown, RI | — | Installer | L1026 |
| Michael Langford | Cranston, RI | — | Designer (Class I) | D1150 |
| Michael Langford | Cranston, RI | — | Installer | L1193 |
| Michael M Harbour | Coventry, RI | — | Designer (Class I) | D1289 |
| Michael M Harbour | Coventry, RI | — | Installer | L1856 |
| Michael Netro A | North Inc Kingstown, RI | — | Designer (Class I) | D1291 |
| Michael P Fox | Warwick, RI | — | Installer | L1511 |
| Michael Perri & Sons Inc | Warwick, RI | — | Septage Hauler | 780 |
| Michael R Darveau | Inc. Cumberland, RI | — | Designer (Class II) | D2116 |
| Michael R Masson | Wakefield, RI | — | Installer | L0718 |
| Michael R Tougas | North Kingstown, RI | — | Installer | L1956 |
| Michael S Faria | Seekonk MA ext.307, RI | — | Designer (Class III) | D3107 |
| Michael S Faria | Seekonk, MA | — | Designer (Class IV Soil Evaluator) | D4085 |
| Michael T Atkinson | — | — | Installer | L1701 |
| Michael T Brosseau | Bradford, RI | — | Installer | L2047 |
| Michael T Saccoccia | Coventry LLC, RI | — | Designer (Class I) | D1268 |
| Michael T Saccoccia | LLC Coventry, RI | — | Installer | L1531 |
| Michael Thatcher | Cranston, RI | — | Installer | L0699 |
| Michael W Susi | Johnston, RI | — | Installer | L0986 |
| Micheal Esposito | Harrisville, RI | — | Installer | L1855 |
| Mohamed H Hussein | — | — | Designer (Class III) | D3158 |
| Monique Towle | Cumberland, RI | — | Designer (Class I) | D1281 |
| Monique Towle | Cumberland, RI | — | Installer | L1831 |
| Morris Maglioli | Johnston, RI | — | Installer | L1431 |
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