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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| Sacco Enterprises Inc | Westerly, RI | — | Septage Hauler | 359 |
| Salvatore E Cherenzia IV | Pawcatuck, CT | — | Installer | L1780 |
| Samuel A White Jr. | Providence RI ext 231, RI | — | Designer (Class II) | D2020 |
| Samuel R Suorsa | Coventry, RI | — | Designer (Class II) | D2147 |
| Samuel R Suorsa | Coventry, RI | — | Designer (Class IV Soil Evaluator) | D4087 |
| Samuel S Hemenway | Providence, RI | — | Designer (Class III) | D3064 |
| Sarah J Pytko | North Smithfield, RI | — | Installer | L1801 |
| Scituate Cesspool Inc | Johnston, RI | — | Septage Hauler | 330 |
| Scituate Portable Restrooms, Inc. | Johnston, RI | — | Septage Hauler | 586 |
| Scot E Deledda | North Stonington, CT | — | Designer (Class III) | D3100 |
| Scot E Deledda | North Stonington, CT | — | Installer | L1751 |
| Scott D Hallman | Toilets Portsmouth, RI | — | Installer | L2053 |
| Scott F Moorehead | Coventry, RI | — | Designer (Class III) | D3018 |
| Scott F Moorehead | Coventry, RI | — | Designer (Class IV Soil Evaluator) | D4009 |
| Scott Grenon | Exeter, RI | — | Designer (Class I) | D1245 |
| Scott Grenon | Exeter, RI | — | Installer | L1614 |
| Scott M Davis | Bristol, RI | — | Installer | L1989 |
| Scott M O'Connor | Cumberland, RI | — | Designer (Class III) | D3113 |
| Scott M O'Connor | Cumberland, RI | — | Installer | L1797 |
| Scott P Rabideau | Harrisville, RI | — | Installer | L1379 |
| Scott R Ringland | Johnston, RI | — | Installer | L1494 |
| Scott S DaSilveira | Warren, RI | — | Installer | L1810 |
| Scott W Rylah | Pascoag, RI | — | Designer (Class I) | D1100 |
| Scott W Rylah | Pascoag, RI | — | Installer | L0990 |
| Scott W Zaroogian | Wakefield, RI | — | Installer | L1116 |
| Seamus M Moran | Mystic, CT | — | Designer (Class III) | D3167 |
| Sean M MacLeod | North Scituate, RI | — | Installer | L1466 |
| Sean P Condon | Chepachet, RI | — | Installer | L1781 |
| Sean P Grundy | North Kingstown, RI | — | Installer | L1435 |
| Seraphin DaPonte | Bristol, RI | — | Installer | L0837 |
| Sergio F Cherenzia | Westerly, RI | — | Designer (Class III) | D3111 |
| Shane P Driscoll | Lincoln, RI | — | Designer (Class III) | D3157 |
| Shane W Bettez | Hope, RI | — | Installer | L1848 |
| Shawn Pacheco | Dartmouth, MA | — | Installer | L1866 |
| Shon C Cuthill Jr | Exeter, RI | — | Installer | L1969 |
| Shoreline Sanitation | Westerly, RI | — | Septage Hauler | 680 |
| Simon P Olean | Portmouth, RI | — | Installer | L1923 |
| Soares Sanitation Pumping | Taunton, MA | — | Septage Hauler | 725 |
| Sophia D Narkiewicz | Greene, RI | — | Designer (Class III) | D3143 |
| Sophia D Narkiewicz | Greene, RI | — | Designer (Class IV Soil Evaluator) | D4082 |
| Stephan H Winsor | North Scituate, RI | — | Designer (Class I) | D1279 |
| Stephan H Winsor | North Scituate, RI | — | Installer | L1807 |
| Stephen A Cary | Warwick, RI | — | Installer | L1599 |
| Stephen A DeCastro | Portsmouth, RI | — | Installer | L1895 |
| Stephen F Wood | Riverside, RI | — | Installer | L1734 |
| Stephen F Wyatt | Portsmouth, RI | — | Designer (Class I) | D1113 |
| Stephen F Wyatt | Portsmouth, RI | — | Installer | L1368 |
| Stephen H Winsor | North Scituate, RI | — | Installer | L0433 |
| Stephen J Colucci | Glocester, RI | — | Installer | L1850 |
| Stephen J Oliveira | Tiverton, RI | — | Installer | L1378 |
| Stephen J Teixeira | Lincoln, RI | — | Installer | L1525 |
| Stephen L Matteson | Exeter, RI | — | Installer | L2059 |
| Stephen M Hooper | Plainville, MA | — | Installer | L1484 |
| Stephen Sherman | Wakefield, RI | — | Installer | L0899 |
| Steve Allen | North Kingstown, RI | — | Designer (Class I) | D1117 |
| Steve Allen | North Kingstown, RI | — | Installer | L0526 |
| Steven A Croteau | Tiverton, RI | — | Installer | L1875 |
| Steven D Gioiosa | Raynham, MA | — | Designer (Class II) | D2069 |
| Steven E Henry | Providence, RI | — | Designer (Class IV Soil Evaluator) | D4026 |
| Steven F Breene | West Greenwich, RI | — | Installer | L1851 |
| Steven G Treml | Wakefield, RI | — | Installer | L1674 |
| Steven Gianlorenzo | East Providence, RI | — | Installer | L1260 |
| Steven J Richtarik | Lincoln, RI | — | Designer (Class III) | D3052 |
| Steven M Cabral | Warwick, RI | — | Designer (Class III) | D3003 |
| Steven M Pinch | Wakefield, RI | — | Designer (Class II) | D2014 |
| Steven R Hume | West Greenwich, RI | — | Installer | L2004 |
| Superior Septic Service | Saunderstown, RI | — | Septage Hauler | 709 |
| Susan B Capasso | Narragansett, RI | — | Designer (Class III) | D3087 |
| Susan B Capasso | Narragansett, RI | — | Designer (Class IV Soil Evaluator) | D4028 |
| Susan E Moberg | Providence, RI | — | Designer (Class IV Soil Evaluator) | D4033 |
| Syl Pauley Jr. | Dayville, CT | — | Designer (Class III) | D3021 |
| Syl Pauley Jr. | Dayville, CT | — | Installer | L0554 |
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