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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| Nathan S Fields | North Scituate, RI | — | Installer | L2001 |
| New London County Septic Service, Inc. | Ledyard, CT | — | Septage Hauler | 1018 |
| Nicholas A Mattiello Jr | Cranston, RI | — | Designer (Class III) | D3168 |
| Nicholas D Laudati | Narragansett, RI | — | Installer | L1992 |
| Nicholas J Piampiano | Scituate, RI | — | Designer (Class III) | D3059 |
| Nicholas J Piampiano | Scituate, RI | — | Designer (Class IV Soil Evaluator) | D4079 |
| Nicholas M Pauling | Inc. Ayer, MA | — | Designer (Class II) | D2132 |
| Nicholas Veltri | Narragansett, RI | — | Designer (Class II) | D2019 |
| Nicholas Veltri | Narragansett, RI | — | Designer (Class IV Soil Evaluator) | D4023 |
| Nicholas W Capezza | Cranston, RI | — | Designer (Class III) | D3004 |
| Nichols Polseno | Scituate, RI | — | Installer | L1924 |
| Nicole L Letendre | Swansea, MA | — | Designer (Class IV Soil Evaluator) | D4019 |
| Nicole Reilly | Inc. Cranston, RI | — | Designer (Class II) | D2120 |
| Nikki C Gladding | Jamestown, RI | — | Designer (Class III) | D3121 |
| Norman Chapdelaine | Coventry, RI | — | Installer | L0025 |
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