South Dakota wastewater permits expiring in 2027
42 NPDES permits · 11 MGD combined average flow
42 publicly owned wastewater treatment plants in South Dakota hold NPDES permits that expire during 2027, issued by South Dakota Department of Agriculture and Natural Resources. The table lists each plant with its permit number, expiry month, average flow, treatment technology and three-year violation count, in order of expiry.
An NPDES permit runs for five years. To keep discharging, a plant must apply for renewal at least 180 days before the expiry date, and the renewed permit usually arrives with tighter effluent limits, new monitoring requirements or a compliance schedule. That is why the year a permit expires is the year a plant starts budgeting for upgrades: nutrient removal, disinfection, capacity or controls.
| Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|
| Worthing, City Of | Worthing | 0.02 | SD0021474 | Jan 2027 | 34 |
| Bridgewater, City Of | Bridgewater | — | SD0021512 | Jan 2027 | 32 |
| St. Lawrence, Town Of | St. Lawrence | — | SD0020982 | Jan 2027 | 1 |
| Hill City, City Of | Hill City | 0.17 | SD0020885 | Feb 2027 | 1 |
| Grand River Casino And Resort | Mobridge | 0.01 | NDG589306 | Mar 2027 | 16 |
| Big Bend Lagoon System | Fort Thompson | — | SDG589201 | Mar 2027 | — |
| Black Pipe, Community Of | Rosebud | — | SDG589602 | Mar 2027 | 0 |
| Crow Creek Lagoon System | Fort Thompson | — | SDG589202 | Mar 2027 | 30 |
| Fort Thompson-East | Fort Thompson | — | SDG589205 | Mar 2027 | — |
| Fort Thompson Lagoon System | Fort Thompson | — | SDG589203 | Mar 2027 | — |
| Kennebec, Town Of | Kennebec | — | SD0022861 | Mar 2027 | 48 |
| Manderson Community Lagoon | Manderson | — | SDG589504 | Mar 2027 | — |
| Martin Sunrise Housing WW Lagoon | Martin | — | SDG589505 | Mar 2027 | 146 |
| Marty Community Wastewater Lagoon | Marty | — | SDG589702 | Mar 2027 | — |
| Monroe, Town Of | Monroe | — | SD0023752 | Mar 2027 | 1 |
| Oglala Community Lagoon | Oglala | — | SDG589506 | Mar 2027 | — |
| Parmelee Community | Parmelee | — | SDG589607 | Mar 2027 | 0 |
| Porcupine Community Lagoon | Porcupine | — | SDG589525 | Mar 2027 | — |
| Potato Creek Community Lagoon | Pine Ridge | — | SDG589508 | Mar 2027 | 16 |
| Red Shirt Community Lagoon Facility | Red Shirt | — | SDG589509 | Mar 2027 | — |
| Rosebud Community | Rosebud | — | SDG589608 | Mar 2027 | 12 |
| Scotland, City Of | Scotland | — | SD0022853 | Mar 2027 | 1 |
| Sharp'S Corner Lagoon System | Kyle | — | SDG589510 | Mar 2027 | — |
| Spring Creek, Community Of | Spring Creek | — | SDG589609 | Mar 2027 | 6 |
| Stephan Lagoon System | Stephan | — | SDG589204 | Mar 2027 | — |
| Wakpamni Community Lagoon | Pine Ridge | — | SDG589511 | Mar 2027 | — |
| West Brule Lagoon North | Lower Brule | — | SDG589401 | Mar 2027 | 46 |
| West Brule Lagoon South | Lower Brule | — | SDG589402 | Mar 2027 | 46 |
| Wolf Creek Lagoon | Pine Ridge | — | SDG589512 | Mar 2027 | — |
| Wounded Knee Community Lagoon | Pine Ridge | — | SDG589513 | Mar 2027 | — |
| Wilmot, City Of | Wilmot | 2.35 | SD0021024 | May 2027 | 24 |
| Huron, City Of | Huron | 4.88 | SD0023434 | Jun 2027 | 21 |
| Pierre, City Of | Pierre | 1.49 | SD0020176 | Jun 2027 | 3 |
| Freeman, City Of | Freeman | 0.29 | SD0022110 | Jun 2027 | 3 |
| Madison-Treatment Plant | Madison | — | SD0020010 | Jun 2027 | 0 |
| Irene - City Of | Irene | — | SD0022454 | Aug 2027 | 15 |
| Tabor - Town Of | Tabor | — | SD0022209 | Sep 2027 | 2 |
| Spearfish, City Of (wtp) | Spearfish | 1.18 | SDG860058 | Oct 2027 | 4 |
| Oacoma, Town Of | Oacoma | 0.39 | SD0020737 | Dec 2027 | 5 |
| Lennox, City Of | Lennox | 0.16 | SD0021768 | Dec 2027 | 3 |
| Blunt- City Of | Blunt | — | SD0025020 | Dec 2027 | 1 |
| Howard, City Of | Howard, City Of | — | SD0020613 | Dec 2027 | 133 |
South Dakota permit renewals in 2027: questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed October 26, 2026.
Wastewater terms: NPDES permit · POTW · Biological nutrient removal · Tertiary treatment · Biosolids · Filter press · all terms
Cite this page
Journalists, researchers and educators are welcome to quote these figures. Please credit Klarifi as the source and link to this page.
Klarifi. “NPDES permits expiring in 2027: South Dakota plants.” Updated October 26, 2026. https://klarifi.io/facilities/south-dakota/permits-expiring/2027Need a custom cut of the data for a state, a county or a list of plants? Email info@klarifi.io.