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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| Land Works LLC DBA Proseptic | East Greenwich, RI | — | Septage Hauler | 951 |
| Larry Torti | Harmony, RI | — | Installer | L1909 |
| Lawrence A Aubin Jr. | East Providence, RI | — | Installer | L1317 |
| Lawrence G Desormier | Chepachet, RI | — | Installer | L1325 |
| Lee W Duffin | North Kingstown, RI | — | Designer (Class I) | D1112 |
| Lee W Duffin | North Kingstown, RI | — | Installer | L1254 |
| Legacy Pumping Inc | Plymouth, MA | — | Septage Hauler | 1007 |
| Leon J Sylvia | Tiverton, RI | — | Installer | L1508 |
| Leonard F Potter | Westport, MA | — | Installer | L0337 |
| Leonard R Bradley Jr. | Inc. Cranston, RI | — | Designer (Class III) | D3042 |
| Lewell P Andrews Jr. | Carolina, RI | — | Installer | L0995 |
| Linda M Stedman | South Kingstown, RI | — | Designer (Class I) | D1065 |
| Linda M Stedman | South Kingstown, RI | — | Installer | L0698 |
| Love Sanitation | Swansea, MA | — | Septage Hauler | 834 |
| Lucas D D'Allesandro | Foster, RI | — | Installer | L1554 |
| Luigi A Marietti Jr. | Hope, RI | — | Installer | L1822 |
| Luigi Crispino | North Scituate, RI | — | Installer | L1452 |
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