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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| Carl J Adamo | Lincoln, RI | — | Designer (Class III) | D3058 |
| Carlos Mendes | Riverside, RI | — | Installer | L0909 |
| Carmino Paliotta | Johnston, RI | — | Designer (Class I) | D1167 |
| Carmino Paliotta | Johnston, RI | — | Installer | L1363 |
| Carolyn J Doyle | Hope Valley, RI | — | Designer (Class III) | D3067 |
| Carolyn J Doyle | Hope Valley, RI | — | Designer (Class IV Soil Evaluator) | D4072 |
| Cassie's Cans | West Kingston, RI | — | Septage Hauler | 940 |
| Charee M Jackson | Charlestown, RI | — | Designer (Class III) | D3116 |
| Charles A Lang | North Scituate, RI | — | Installer | L1460 |
| Charles D Kenyon | West Kingston, RI | — | Installer | L0627 |
| Charles K Recchia | North Stonington, CT | — | Installer | L1965 |
| Charles N Botka Jr. | Charlestown, RI | — | Installer | L1245 |
| Charles R Franklin | Exeter, RI | — | Installer | L1560 |
| Charles W Harris Jr | Harmony, RI | — | Installer | L0919 |
| Chris J Cipriano | Cranston, RI | — | Designer (Class I) | D1299 |
| Chris J Cipriano | Cranston, RI | — | Installer | L1873 |
| Christian B Sutter Timothy S Tarbox D4041 | Coventry, RI | — | Designer (Class IV Soil Evaluator) | D4077 |
| Christian D Reeves | Block Island, RI | — | Installer | L1868 |
| Christine N Beaulieu-Shea | Providence, RI | — | Designer (Class III) | D3079 |
| Christopher A Duhamel | Inc. Cranston, RI | — | Designer (Class III) | D3011 |
| Christopher A Duhamel | Inc. Cranston, RI | — | Designer (Class IV Soil Evaluator) | D4006 |
| Christopher E DiFilippo | North Scituate, RI | — | Installer | L2046 |
| Christopher F Hallahan | Westbrook, CT | — | Installer | L2030 |
| Christopher Fonseca | Bristol, RI | — | Designer (Class I) | D1172 |
| Christopher Fonseca | Bristol, RI | — | Installer | L1076 |
| Christopher Francis | Bristol, RI | — | Installer | L1090 |
| Christopher Furtado | Dighton, MA | — | Installer | L1950 |
| Christopher J Blank | Warren, RI | — | Installer | L2042 |
| Christopher J Cordice | Wakefield, RI | — | Installer | L2045 |
| Christopher J Crook | Bellington, MA | — | Installer | L1323 |
| Christopher J DeAngelis | Seekonk, MA | — | Installer | L1478 |
| Christopher M Kent | West Greenwich, RI | — | Installer | L1526 |
| Christopher M Reynolds | East Greenwich, RI | — | Installer | L1982 |
| Christopher P Crowshaw | Inc. Wakefield, RI | — | Designer (Class III) | D3126 |
| Christopher P Crowshaw | Wakefield, RI | — | Installer | L1604 |
| Christopher R Freiberger | Foster, RI | — | Installer | L2020 |
| Christopher S Caouette | Cumberland, RI | — | Installer | L1893 |
| Christopher S Wilkie | Little Compton, RI | — | Installer | L1635 |
| Clayton L Manchester | Tiverton, RI | — | Installer | L2040 |
| Clement Rose | Tiverton, RI | — | Designer (Class I) | D1044 |
| Clement Rose | Tiverton, RI | — | Installer | L0588 |
| Cleveland H Howard Jr | Harrisville, RI | — | Installer | L2061 |
| Cody A Braz | Tiverton, RI | — | Installer | L2037 |
| Cody A O'Rourke | Cumberland, RI | — | Installer | L1906 |
| Cody J Oliver | Dayville, CT | — | Installer | L2023 |
| Coia Sanitation Llc | Cumberland, RI | — | Septage Hauler | 396 |
| Collin D Patterson | Exeter, RI | — | Installer | L1991 |
| Corey R Aiello | Wyoming, RI | — | Installer | L1944 |
| Craig R Carrigan | Wakefield, RI | — | Designer (Class III) | D3005 |
| Craig W Carpenter | Harrisville, RI | — | Designer (Class I) | D1256 |
| Craig W Carpenter | Harrisville, RI | — | Installer | L1755 |
| Croome Sanitation, Inc | Rehoboth, MA | — | Septage Hauler | 351 |
| Curtis M Briggs | Foster, RI | — | Designer (Class I) | D1312 |
| Curtis M Briggs | Foster, RI | — | Installer | L1996 |
| Curtis S Ruotolo | Scituate, RI | — | Designer (Class III) | D3139 |
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