Who issues NPDES permits in South Dakota?

South Dakota Department of Agriculture and Natural Resources issues and enforces NPDES permits for wastewater discharges in South Dakota. Klarifi tracks 120 permits held by publicly owned treatment plants in the state.

How many NPDES permits in South Dakota are expired or administratively continued?

50 permits are administratively continued (the plant applied for renewal and the old permit stays in force) and 0 are recorded as expired, out of 120 permits tracked. 69 are effective.

How many South Dakota wastewater permits come up for renewal soon?

26 in 2026, 40 in 2027 and 10 in 2028. Each year has its own renewal calendar with the plants listed.

How do I look up an NPDES permit number?

Enter the permit number (two letters and seven characters, for example TX0021873) or the plant name in the lookup on the NPDES page; each result opens the plant profile with status, expiry, design flow and the three-year violation count.

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NPDES permits in South Dakota

Name: NPDES permits held by wastewater treatment plants in South Dakota
Creator: Klarifi
License: https://klarifi.io/terms-of-service

120 permits held by publicly owned wastewater treatment plants · issued by DANR

Effective

Administratively continued

Expired

Total tracked

120

South Dakota Department of Agriculture and Natural Resources (DANR) runs the NPDES program in South Dakota under delegation from EPA Region 8, issuing and enforcing the discharge permits listed here. Klarifi tracks 120 permits held by publicly owned treatment plants in the state, with status, expiry, design flow and three-year compliance for each. Agency website →

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.

Permit renewals by year

2026: 26 permits →2027: 40 permits →2028: 10 permits →

2029: 6 permits

2030: 4 permits

2031: 9 permits

Largest permit holders in South Dakota

The 25 largest publicly owned wastewater treatment plants in South Dakota by permitted design flow, with NPDES permit number, status and expiry. Source: EPA ICIS-NPDES via Klarifi.
Facility	City	Avg flow (MGD)	Design (MGD)	NPDES permit	Status	Expires	Violations (3y)
Rapid City Water Reclamation Facility	Rapid City	10.62	12	SD0023574	Administratively continued	Jun 2022	4
Watertown, City Of	Watertown	5.27	—	SD0028614	Terminated	Jun 2018	1
Huron, City Of	Huron	—	2.3	SD0023434	Effective	Jun 2027	21
Pierre, City Of	Pierre	1.61	2.21	SD0020176	Effective	Jun 2027	3
Belle Fourche WTP	Belle Fourche	—	2	SD0021628	Effective	Apr 2028	—
Lead - Deadwood Sanitary District	Deadwood	1.9	2	SD0020796	Administratively continued	Jun 2020	2
Mitchell, City Of	Mitchell	—	2	SD0023361	Effective	Dec 2029	12
Vermillion, City Of	Vermillion	1.42	2	SD0020061	Administratively continued	Sep 2017	2
Madison-Treatment Plant	Madison	—	1.6	SD0020010	Effective	Jun 2027	0
Spearfish, City Of (wtp)	Spearfish	1.21	—	SDG860058	Effective	Oct 2027	4
Sturgis, City Of	Sturgis	—	1.2	SD0020052	Administratively continued	Dec 2025	0
Harrisburg - City Of	Harrisburg, City Of	0.47	1	SD0023728	Effective	Jun 2031	0
Hartford, City Of	Hartford	0.29	1	SD0021750	Administratively continued	Dec 2024	117
Hot Springs, City Of	Hot Springs	0.43	1	SD0022918	Administratively continued	Dec 2017	1
Wilmot, City Of	Wilmot	—	0.81	SD0021024	Effective	May 2027	24
Monroe, Town Of	Monroe	—	0.76	SD0023752	Effective	Mar 2027	1
Beresford, City Of	Beresford	0.19	0.64	SD0020079	Effective	May 2031	5
Mobridge, City Of	Mobridge	0.35	0.6	SD0020028	Administratively continued	Jun 2024	0
Sisseton City Of	Sisseton	—	0.51	SD0020826	Effective	Sep 2028	0
Volga, City Of	Volga, City Of	0.34	0.51	SD0021920	Effective	Dec 2028	34
Frederick, Town Of	Frederick	—	0.5	SD0022152	Administratively continued	Sep 2024	49
Oacoma, Town Of	Oacoma	0.37	0.47	SD0020737	Effective	Dec 2027	5
Freeman, City Of	Freeman	—	0.4	SD0022110	Effective	Jun 2027	6
Kennebec, Town Of	Kennebec	—	0.38	SD0022861	Effective	Mar 2027	48
Tyndall, City Of	Tyndall	—	0.38	SDG920133	Administratively continued	Aug 2026	0

All 120 plants in South Dakota →

NPDES permits in South Dakota: 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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