How many wastewater permits expire in South Dakota in 2027?

40 NPDES permits held by publicly owned wastewater treatment plants in South Dakota expire in 2027, covering a combined average flow of 4 MGD. The busiest month is Mar 2027 with 23 expiries.

What happens when an NPDES permit expires?

The plant must have applied for renewal at least 180 days before the expiry date. If the agency has not reissued the permit by then, the old permit is administratively continued and stays enforceable. The reissued permit typically carries updated effluent limits based on the latest water-quality standards, which is what drives upgrade projects.

Which is the largest plant with a permit expiring in South Dakota in 2027?

Pierre, City Of in Pierre, treating about 1.61 MGD under permit SD0020176, expiring Jun 2027.

How do I get contacts for the plants on this list?

Every plant links to its profile with flow, technology and compliance data. Verified decision-maker contacts for each plant, and the same list for every state and year, are available in Klarifi with a free trial.

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South Dakota wastewater permits expiring in 2027

Name: South Dakota NPDES permits expiring in 2027
Creator: Klarifi
License: https://klarifi.io/terms-of-service

40 NPDES permits · 4 MGD combined average flow

40 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.

Other years:

2026 (26)2028 (10)All South Dakota NPDES permits →

Publicly owned wastewater treatment plants in South Dakota with NPDES permits expiring in 2027, from EPA ICIS-NPDES records. Refreshed on every release.
Facility	City	Avg flow (MGD)	NPDES permit	Expires	Technology	Violations (3y)
Bridgewater, City Of	Bridgewater	—	SD0021512	Jan 2027	Uncovered lagoons	32
St. Lawrence, Town Of	St. Lawrence	—	SD0020982	Jan 2027	Uncovered lagoons	1
Worthing, City Of	Worthing	—	SD0021474	Jan 2027	Uncovered lagoons	33
Hill City, City Of	Hill City	0.2	SD0020885	Feb 2027	—	1
Big Bend Lagoon System	Fort Thompson	—	SDG589201	Mar 2027	Uncovered lagoons	—
Black Pipe, Community Of	Rosebud	—	SDG589602	Mar 2027	Uncovered lagoons	0
Crow Creek Lagoon System	Fort Thompson	—	SDG589202	Mar 2027	Uncovered lagoons	32
Fort Thompson Lagoon System	Fort Thompson	—	SDG589203	Mar 2027	Uncovered lagoons	—
Kennebec, Town Of	Kennebec	—	SD0022861	Mar 2027	Uncovered lagoons	48
Manderson Community Lagoon	Manderson	—	SDG589504	Mar 2027	Uncovered lagoons	—
Martin Sunrise Housing WW Lagoon	Martin	—	SDG589505	Mar 2027	Uncovered lagoons	116
Marty Community Wastewater Lagoon	Marty	—	SDG589702	Mar 2027	Uncovered lagoons	—
Monroe, Town Of	Monroe	—	SD0023752	Mar 2027	Uncovered lagoons	1
Oglala Community Lagoon	Oglala	—	SDG589506	Mar 2027	Uncovered lagoons	—
Parmelee Community	Parmelee	—	SDG589607	Mar 2027	Uncovered lagoons	0
Porcupine Community Lagoon	Porcupine	—	SDG589525	Mar 2027	Aerated lagoons, Uncovered lagoons	—
Potato Creek Community Lagoon	Pine Ridge	—	SDG589508	Mar 2027	Uncovered lagoons	16
Red Shirt Community Lagoon Facility	Red Shirt	—	SDG589509	Mar 2027	Uncovered lagoons	—
Rosebud Community	Rosebud	—	SDG589608	Mar 2027	Uncovered lagoons	12
Scotland, City Of	Scotland	—	SD0022853	Mar 2027	Aerated lagoons, Uncovered lagoons	1
Sharp'S Corner Lagoon System	Kyle	—	SDG589510	Mar 2027	Uncovered lagoons	—
Stephan Lagoon System	Stephan	—	SDG589204	Mar 2027	Uncovered lagoons	—
Wakpamni Community Lagoon	Pine Ridge	—	SDG589511	Mar 2027	Uncovered lagoons	—
West Brule Lagoon North	Lower Brule	—	SDG589401	Mar 2027	Uncovered lagoons	46
West Brule Lagoon South	Lower Brule	—	SDG589402	Mar 2027	Uncovered lagoons	46
Wolf Creek Lagoon	Pine Ridge	—	SDG589512	Mar 2027	Uncovered lagoons	—
Wounded Knee Community Lagoon	Pine Ridge	—	SDG589513	Mar 2027	Aerated lagoons, Uncovered lagoons	—
Wilmot, City Of	Wilmot	—	SD0021024	May 2027	Uncovered lagoons	24
Pierre, City Of	Pierre	1.61	SD0020176	Jun 2027	—	3
Ft Pierre - City Of	Fort Pierre	0.22	SD0023582	Jun 2027	—	40
Freeman, City Of	Freeman	—	SD0022110	Jun 2027	Aerated lagoons, Uncovered lagoons	6
Huron, City Of	Huron	—	SD0023434	Jun 2027	Uncovered lagoons	21
Madison-Treatment Plant	Madison	—	SD0020010	Jun 2027	Carrousels / oxidation ditches, Biogas silos, Biogas balloons	0
Irene - City Of	Irene	—	SD0022454	Aug 2027	Uncovered lagoons	15
Tabor - Town Of	Tabor	—	SD0022209	Sep 2027	Uncovered lagoons	2
Spearfish, City Of (wtp)	Spearfish	1.21	SDG860058	Oct 2027	—	4
Oacoma, Town Of	Oacoma	0.37	SD0020737	Dec 2027	Aerated lagoons	5
Lennox, City Of	Lennox	0.18	SD0021768	Dec 2027	Uncovered lagoons	3
Blunt- City Of	Blunt	—	SD0025020	Dec 2027	Uncovered lagoons	1
Howard, City Of	Howard, City Of	—	SD0020613	Dec 2027	Uncovered lagoons	115

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 September 11, 2026.

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