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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| S & M Construction | Bottineau, ND | — | Installer | — |
| S&S Septic Solutions, LLC | Arthur, ND | Cass | Pumper (Class I) | NDSP007378 |
| Salhus Septic Pumping | Underwood, ND | McLean | Pumper (Class I) | NDSP007327 |
| Sanderson Excavation | Edmore, ND | — | Installer | — |
| Sanitary Septic Services | Baldwin, ND | Burleigh | Pumper (Class II) | NDSP007343 |
| Sattler Homes Inc | Bismarck, ND | — | Installer | — |
| SAYLER EXCAVATING and GRAVEL, LLC | Steele, ND | — | Installer | — |
| Schaff And Sons Repair | Mandan, ND | — | Installer | — |
| Scherbenske Inc. | Jamestown, ND | — | Installer | — |
| Scherbenske, Inc. | Jamestown, ND | Stutsman | Pumper (Class II) | NDSP007331 |
| Schimelfenig Excavating | Bowdon, ND | — | Installer | — |
| Schirado Enterprises, LLC | Glen Ullin, ND | Grant | Pumper (Class I) | NDSP007294 |
| Schlosser Excavating | Mandan, ND | — | Installer | — |
| Schwab, Rick | Devils Lake, ND | — | Installer | — |
| Scully Design Build, Inc | Williston, ND | — | Installer | — |
| Seader Digging Services LLC | Fraiview, MT | — | Installer | — |
| Seidel Septic LLC | Williston, ND | Williams | Pumper (Class II) | NDSP07400 |
| Selland Construction | Wenatchee, WA | — | Installer | — |
| Septic Pro | Beulah, ND | Mercer | Pumper (Class II) | NDSP007220 |
| Septic Services | Sherwood, ND | Renville | Pumper (Class I) | NDSP007280 |
| Sheehan Construction | Watford City, ND | — | Installer | — |
| Shep's Construction and Excavation | Dickinson, ND | — | Installer | — |
| Sheyenne Septic Service | Leonard, ND | Richland | Pumper (Class II) | NDSP007377 |
| Sims Valley, Llc | Almont, ND | — | Installer | — |
| Singleton Building | Valley City, ND | — | Installer | — |
| Siteworks Unlimited Inc. | West Fargo, ND | — | Installer | — |
| Siteworx Excavation & Development Co., Llc | Fargo, ND | — | Installer | — |
| SJ Septic Tank Service | Kenmare, ND | Ward | Pumper (Class I) | NDSP007358 |
| SK Septic Pumping | Napoleon, ND | Logan | Pumper (Class II) | NDSP007211 |
| Skooter's Pumping | West Fargo, ND | Cass | Pumper (Class II) | NDSP07412 |
| Sletten Excavating, Inc. | Center, ND | — | Installer | — |
| SM Services Corp | Stanley, ND | — | Installer | — |
| Son Oilfield Services LLC | Watford City, ND | McKenzie | Pumper (Class I) | NDSP07413 |
| Southwest Sewer and Excavating | Dickinson, ND | — | Installer | — |
| Sparky Enterprises LLC | Belcourt, ND | — | Installer | — |
| Spearfish Excavating, Inc. | Spearfish, SD | — | Installer | — |
| Spethman Bobcat Service | Dickinson, ND | — | Installer | — |
| Spiffy Biffs - Bruce's Manufactured Housing Inc | Bismarck, ND | Burleigh | Pumper (Class I) | NDSP007295 |
| Springline Construction, Inc. | Worden, MT | — | Installer | — |
| Sss | Langdon, ND | Cavalier | Pumper (Class II) | NDSP07414 |
| Stallion Infrastructure - Dickinson | Dickinson, ND | Stark | Pumper (Class II) | NDSP007341 |
| Stallion Infrastructure - Williston | Williston, ND | Williams | Pumper (Class I) | NDSP007342 |
| Stateline Services | Williston, ND | — | Installer | — |
| Steffes Excavtion and Trucking | Edgely, ND | — | Installer | — |
| Storms Construction, Inc. | Mandan, ND | — | Installer | — |
| Straight Shot Enterprise | Williston, ND | — | Installer | — |
| Strata Corporation | Minot, ND | — | Installer | — |
| Strong Crete, LLC | Driggs, ID | — | Installer | — |
| Sullivan Construction | Dickinson, ND | — | Installer | — |
| Swanson Snow Removal | Devils Lake, ND | — | Installer | — |
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