How many wastewater permits expire in Minnesota in 2028?

238 NPDES permits held by publicly owned wastewater treatment plants in Minnesota expire in 2028, covering a combined average flow of 27 MGD. The busiest month is Nov 2028 with 206 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 Minnesota in 2028?

Seneca Wastewater Treatment Plant in Eagan, treating about 20.44 MGD under permit MN0030007, expiring Nov 2028.

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

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

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Minnesota wastewater permits expiring in 2028

Name: Minnesota NPDES permits expiring in 2028
Creator: Klarifi
License: https://klarifi.io/terms-of-service

238 NPDES permits · 27 MGD combined average flow

238 publicly owned wastewater treatment plants in Minnesota hold NPDES permits that expire during 2028, issued by Minnesota Pollution Control Agency. 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 (28)2027 (35)All Minnesota NPDES permits →

Publicly owned wastewater treatment plants in Minnesota with NPDES permits expiring in 2028, from EPA ICIS-NPDES records. Refreshed on every release.
Facility	City	Avg flow (MGD)	NPDES permit	Expires	Violations (3y)
Appleton WWTP	Appleton	0.16	MN0021890	Jan 2028	8
Lake Henry WWTP	Paynesville	0.02	MN0020885	Jan 2028	34
Hammond WWTP	Zumbro Falls	0.0065	MN0066940	Jan 2028	0
Carlos WWTP	Carlos	—	MN0023019	Jan 2028	3
Hampton WWTP	Hampton	—	MN0021946	Jan 2028	0
Sauk Centre WWTP	Sauk Centre	0.43	MN0024821	Feb 2028	3
Pine Island WWTP	Pine Island	0.23	MN0024511	Feb 2028	4
Glenville WWTP	Glenville	—	MN0021245	Feb 2028	25
Zumbro Falls WWTP	Zumbro Falls	—	MN0051004	Feb 2028	0
Kenyon WWTP	Kenyon	0.18	MN0021628	Mar 2028	18
Crosslake WWTP	Crosslake	0.06	MN0064882	Mar 2028	27
Ogilvie WWTP	Ogilvie	0.04	MN0021997	Mar 2028	11
Bagley WWTP	Bagley	—	MN0022691	Mar 2028	9
Starbuck WWTP	Starbuck	0.18	MN0021415	May 2028	0
Bellechester WWTP	Bellchester	—	MN0022764	May 2028	1
Brewster WWTP	Brewster	—	MN0021750	May 2028	4
Wadena WWTP	Wadena	0.28	MN0020672	Jun 2028	1
Lester Prairie WWTP	Lester Prairie	0.09	MN0023957	Jun 2028	0
Morristown WWTP	Morristown	0.06	MN0025895	Jun 2028	0
Lewiston WWTP	Lewiston	0.08	MN0023965	Jul 2028	14
Saint Clair WWTP	Saint Clair	0.06	MN0024716	Jul 2028	0
Morris WWTP	Morris	—	MN0021318	Jul 2028	9
Fergus Falls WWTP	Fergus Falls	1.39	MN0050628	Aug 2028	2
Spring Valley WWTP	Spring Valley	0.41	MN0051934	Aug 2028	21
Glyndon	Glyndon	—	MN0020630	Aug 2028	6
Harmony WWTP	Harmony	0.06	MN0022322	Sep 2028	1
Saint James	Saint James	0.59	MN0024759	Oct 2028	2
Miltona WWTP	Miltona	—	MN0024155	Oct 2028	17
Seneca Wastewater Treatment Plant	Eagan	20.44	MN0030007	Nov 2028	6
Clarkfield WWTP	Clarkfield	0.91	MNG585093	Nov 2028	33
Warren WWTP	Warren	0.16	MNG585073	Nov 2028	6
Karlstad WWTP	Karlstad	0.07	MNG585146	Nov 2028	29
Darwin WWTP	Darwin	0.04	MNG585150	Nov 2028	14
Pennock WWTP	Pennock	0.03	MNG585104	Nov 2028	12
Urbank WWTP	Clitherall	0.02	MNG585343	Nov 2028	2
Sobieski WWTP	Swan River	0.007	MNG585217	Nov 2028	9
7-Clans Casino WWTP	Thief River Falls	—	MNG585172	Nov 2028	1
Ada WWTP	Ada	—	MNG585095	Nov 2028	11
Alberta WWTP	Alberta	—	MNG585002	Nov 2028	2
Alden WWTP	Alden	—	MNG585118	Nov 2028	3
Alvarado WWTP	Alvarado	—	MNG585171	Nov 2028	1
Argyle WWTP	Argyle	—	MNG585140	Nov 2028	9
Askov WWTP	Askov	—	MNG585229	Nov 2028	0
Audubon	Audubon	—	MNG585148	Nov 2028	50
Avoca & Iona WWTP	Iona	—	MNG585165	Nov 2028	7
Badger Wastewater Treatment Plant	Badger	—	MNG585155	Nov 2028	27
Barnum-Well #2 Entry Point	Barnum	—	MNG585142	Nov 2028	3
Baudette WWTP	Baudette	—	MNG585174	Nov 2028	9
Beaver Creek WWTP	Beaver Creek Township	—	MNG585055	Nov 2028	30
Bellingham WWTP	Bellingham	—	MNG585152	Nov 2028	6
Belview WWTP	Belview	—	MNG585003	Nov 2028	4
Bertha WWTP	Bertha	—	MNG585371	Nov 2028	3
Big Falls	Big Falls	—	MNG585135	Nov 2028	13
Bigelow WWTP	Bigelow Township	—	MNG585224	Nov 2028	0
Bigfork	Bigfork	—	MNG585363	Nov 2028	18
Bird Island WWTP	Bird Island	—	MNG585390	Nov 2028	10
Blomkest Svea Sewer Board WWTP	Blomkest	—	MNG585372	Nov 2028	0
Brooten WWTP	Brooten	—	MNG585271	Nov 2028	1
Buffalo Lake WWTP	Buffalo Lake	—	MNG585373	Nov 2028	1
Campbell	Campbell	—	MNG585130	Nov 2028	9
Canby WWTP	Canby	—	MNG585154	Nov 2028	6
Ceylon WWTP	Ceylon	—	MNG585006	Nov 2028	135
Chokio WWTP	Chokio	—	MNG585007	Nov 2028	20
Clarks Grove WWTP	Clarks Grove	—	MNG585067	Nov 2028	6
Clearbrook WWTP	Leon Township	—	MNG585098	Nov 2028	7
Clements WWTP	Clements	—	MNG585094	Nov 2028	2
Cleveland WWTP	Cleveland	—	MNG585009	Nov 2028	5
Climax WWTP	Climax	—	MNG585169	Nov 2028	0
Clinton WWTP	Clinton	—	MNG585193	Nov 2028	2
Clontarf WWTP	Clontarf Township	—	MNG585108	Nov 2028	8
Community Of Roseland WWTP	Blomkest	—	MNG585393	Nov 2028	0
Comstock WWTP	Comstock	—	MNG585131	Nov 2028	4
Conger WWTP	Conger	—	MNG585222	Nov 2028	14
Cook WWTP	Cook	—	MNG585179	Nov 2028	0
Cosmos WWTP	Cosmos Township	—	MNG585056	Nov 2028	11
Cottonwood WWTP	Cottonwood	—	MNG585010	Nov 2028	13
Currie City Of	Currie	—	MNG585221	Nov 2028	0
Danube WWTP	Danube	—	MNG585057	Nov 2028	9
Danvers WWTP	Danvers	—	MNG585119	Nov 2028	20
Deer Creek WWTP	Deer Creek	—	MNG585180	Nov 2028	0
Deer River WWTP	Deer River	—	MNG585181	Nov 2028	9
Degraff WWTP	De Graff	—	MNG585398	Nov 2028	23
Delavan WWTP	Delavan	—	MNG585109	Nov 2028	1
Dexter WWTP	Dexter	—	MNG585228	Nov 2028	1
Dunnell WWTP	Dunnell	—	MNG585279	Nov 2028	44
Eagle Bend WWTP	Eagle Bend	—	MNG585383	Nov 2028	8
Echo WWTP	Echo	—	MNG585059	Nov 2028	27
Elizabeth WWTP	Elizabeth Township	—	MNG585012	Nov 2028	1
Elkton WWTP	Elkton	—	MNG585013	Nov 2028	11
Elmore WWTP	Elmore	—	MNG585110	Nov 2028	5
Elysian	Elysian	—	MNG585285	Nov 2028	3
Evan WWTP	Evan	—	MNG585202	Nov 2028	0
Evansville WWTP	Evansville	—	MNG585074	Nov 2028	4
Fairfax WWTP	Fairfax	—	MNG585060	Nov 2028	70
Farwell Kensington Sanitary D	Kensington	—	MNG585220	Nov 2028	6
Felton WWTP	Felton Township	—	MNG585149	Nov 2028	1
Fertile WWTP	Fertile	—	MNG585138	Nov 2028	0
Finlayson WWTP	Finlayson	—	MNG585203	Nov 2028	2
Fisher WWTP	Fisher Township	—	MNG585170	Nov 2028	62
Flensburg WWTP	Flensburg	—	MNG585016	Nov 2028	16
Floodwood WWTP	Floodwood	—	MNG585048	Nov 2028	17
Foreston WWTP	Foreston	—	MNG585017	Nov 2028	0
Freeborn WWTP	Freeborn	—	MNG585018	Nov 2028	11
Freeport WWTP	Freeport	—	MNG585019	Nov 2028	5
Frost WWTP	Frost	—	MNG585120	Nov 2028	19
Fulda WWTP	Fulda	—	MNG585188	Nov 2028	11
Fulda WWTP	Dundee	—	MNG585349	Nov 2028	17
Garfield WWTP	Garfield	—	MNG585158	Nov 2028	1
Gary WWTP	Gary	—	MNG585175	Nov 2028	163
Gaylord WWTP	Gaylord	—	MNG585204	Nov 2028	42
Gem Sanitary District	Meire Grove	—	MNG585205	Nov 2028	7
Geneva WWTP	Geneva	—	MNG585292	Nov 2028	4
Georgetown	Georgetown	—	MNG585132	Nov 2028	79
Ghent	Ghent	—	MNG585121	Nov 2028	0
Gilman WWTP	Gilman	—	MNG585021	Nov 2028	2
Good Thunder WWTP	Good Thunder	—	MNG585206	Nov 2028	3
Goodridge WWTP	Goodridge	—	MNG585022	Nov 2028	1
Granada WWTP	Granada	—	MNG585023	Nov 2028	26
Greenbush WWTP	Greenbush	—	MNG585156	Nov 2028	26
Hallock WWTP	Hallock Township	—	MNG585147	Nov 2028	0
Hamburg WWTP	Young America Township	—	MNG585386	Nov 2028	24
Hancock WWTP	Hancock	—	MNG585299	Nov 2028	31
Hanley Falls WWTP	Hanley Falls	—	MNG585122	Nov 2028	14
Hardwick WWTP	Hardwick	—	MNG585194	Nov 2028	26
Hartland Wastewater Treatment Plant	Hartland	—	MNG585102	Nov 2028	72
Hayward WWTP	Hayward	—	MNG585391	Nov 2028	1
Hendricks WWTP	Hendricks	—	MNG585377	Nov 2028	0
Hendrum WWTP	Hendrum Township	—	MNG585176	Nov 2028	27
Hewitt WWTP	Hewitt	—	MNG585024	Nov 2028	0
Hill City WWTP	Hill City	—	MNG585182	Nov 2028	4
Hills WWTP	Hills	—	MNG585196	Nov 2028	20
Hitterdal WWTP	Hitterdal	—	MNG585178	Nov 2028	0
Hollandale WWTP	Hollandale	—	MNG585374	Nov 2028	85
Ivanhoe WWTP	Ivanhoe	—	MNG585103	Nov 2028	52
Janesville WWTP	Janesville Township	—	MNG585025	Nov 2028	0
Jasper WWTP	Jasper	—	MNG585026	Nov 2028	6
Jeffers WWTP	Jeffers	—	MNG585111	Nov 2028	4
Kelliher WWTP	Kelliher	—	MNG585068	Nov 2028	174
Kellogg WWTP	Kellogg	—	MNG585027	Nov 2028	0
Kennedy WWTP	Kennedy	—	MNG585028	Nov 2028	3
Kettle River	Kettle River	—	MNG585183	Nov 2028	6
Kiester WWTP	Kiester Township	—	MNG585097	Nov 2028	8
Kilkenny WWTP	Kilkenny	—	MNG585084	Nov 2028	44
Lac Qui Parle Valley	Madison	—	MNG585091	Nov 2028	54
Lake Bronson WWTP	Lake Bronson	—	MNG585029	Nov 2028	1
Lake Lillian WWTP	Lake Lillian	—	MNG585225	Nov 2028	5
Lake Park WWTP	Lake Park	—	MNG585157	Nov 2028	6
Lake Wilson WWTP	Lake Wilson	—	MNG585061	Nov 2028	2
Lamberton WWTP	Lamberton Township	—	MNG585100	Nov 2028	3
Lancaster WWTP	Lancaster	—	MNG585066	Nov 2028	21
Leota Sanitary District WWTP	Leota	—	MNG585219	Nov 2028	40
Lewisville WWTP	Lewisville	—	MNG585314	Nov 2028	16
Lismore WWTP	Lismore Township	—	MNG585076	Nov 2028	30
Littlefork WWTP	Littlefork	—	MNG585081	Nov 2028	26
Lowry WWTP	Lowry	—	MNG585123	Nov 2028	0
Lucan WWTP	Lucan	—	MNG585112	Nov 2028	0
Lynd WWTP	Lynd	—	MNG585030	Nov 2028	35
Magnolia WWTP	Magnolia	—	MNG585190	Nov 2028	0
Mapleton WWTP	Mapleton	—	MNG585089	Nov 2028	11
Marietta WWTP	Marietta	—	MNG585160	Nov 2028	4
Mcgregor WWTP	Mcgregor	—	MNG585405	Nov 2028	0
Mcintosh WWTP	Mcintosh	—	MNG585031	Nov 2028	3
Mckinley WWTP	Mckinley	—	MNG585367	Nov 2028	7
Meriden Township WWTP	Owatonna	—	MNG585319	Nov 2028	64
Middle River WWTP	Middle River	—	MNG585163	Nov 2028	17
Milan WWTP	Milan	—	MNG585141	Nov 2028	7
Milroy	Milroy	—	MNG585124	Nov 2028	39
Minneota WWTP	Minneota	—	MNG585033	Nov 2028	20
Moose Lake WWTP	Moose Lake	—	MNG585401	Nov 2028	17
Newfolden WWTP	New Folden Township	—	MNG585145	Nov 2028	25
Nicollet WWTP	Nicollet	—	MNG585037	Nov 2028	5
Nielsville WWTP	Nielsville	—	MNG585166	Nov 2028	4
Northome WWTP	Northome	—	MNG585185	Nov 2028	1
Odessa WWTP	Odessa Township	—	MNG585099	Nov 2028	49
Odin-Ormsby WWTP	Odin	—	MNG585369	Nov 2028	0
Oklee WWTP	Oklee	—	MNG585038	Nov 2028	1
Ortonville WWTP	Ortonville	—	MNG585151	Nov 2028	9
Osakis WWTP	Osakis	—	MN0020028	Nov 2028	8
Oslo WWTP	Oslo	—	MNG585379	Nov 2028	0
Pease WWTP	Pease	—	MNG585167	Nov 2028	9
Pemberton WWTP	Pemberton	—	MNG585075	Nov 2028	0
Perley WWTP	Perley	—	MNG585326	Nov 2028	43
Plummer	Plummer	—	MNG585327	Nov 2028	0
Porter WWTP	Porter	—	MNG585128	Nov 2028	12
Raymond	Raymond	—	MNG585197	Nov 2028	4
Red Lake Falls WWTP	Red Lake Falls Township	—	MNG585161	Nov 2028	0
Remer WWTP	Remer	—	MNG585210	Nov 2028	1
Revere WWTP	Revere	—	MNG585114	Nov 2028	1
Rollingstone WWTP	Rollingstone Township	—	MNG585078	Nov 2028	0
Rothsay WWTP	Rothsay	—	MNG585064	Nov 2028	1
Rushmore WWTP	Rushmore	—	MNG585201	Nov 2028	24
Russell WWTP	Russell	—	MNG585062	Nov 2028	113
Ruthton WWTP	Ruthton	—	MNG585105	Nov 2028	8
Sabin WWTP	Sabin	—	MNG585133	Nov 2028	17
Saint Hilaire WWTP	Saint Hilaire	—	MNG585334	Nov 2028	10
Saint Martin WWTP	Saint Martin	—	MNG585402	Nov 2028	11
Sanborn Wastewater Treatment Plant	Sanborn	—	MNG585115	Nov 2028	30
Sargeant WWTP	Sargeant Township	—	MNG585214	Nov 2028	4
Searles WWTP	Searles	—	MNG585080	Nov 2028	2
Serpent Lake WWTP	Crosby	—	MNG585215	Nov 2028	1
Shafer WWTP	Shafer	—	MNG585047	Nov 2028	3
Shelly WWTP	Shelly	—	MNG585227	Nov 2028	16
Shetek Area Water & Sewer District WWTP	Currie	—	MNG585403	Nov 2028	1
Silver Lake WWTP	Lakeville	—	MNG585164	Nov 2028	0
Slayton WWTP	Slayton	—	MNG585191	Nov 2028	27
Sleepy Eye WWTP	Sleepy Eye	—	MNG585041	Nov 2028	9
Steen WWTP	Steen	—	MNG585199	Nov 2028	5
Stockton WWTP	Stockton	—	MNG585079	Nov 2028	7
Storden WWTP	Storden Township	—	MNG585106	Nov 2028	5
Sunburg WWTP	Sunburg	—	MNG585125	Nov 2028	21
Taunton WWTP	Taunton	—	MNG585090	Nov 2028	4
Tower/breitung WWTP	Soudan	—	MNG585186	Nov 2028	0
Twin Lakes WWTP	Twin Lakes	—	MNG585042	Nov 2028	74
Twin Valley	Twin Valley	—	MNG585137	Nov 2028	2
Tyler WWTP	Tyler	—	MNG585116	Nov 2028	3
Ulen WWTP	Ulen Township	—	MNG585088	Nov 2028	20
Vesta WWTP	Vesta	—	MNG585043	Nov 2028	22
Viking Wastewater Treatment I	Viking	—	MNG585370	Nov 2028	5
Wahkon WWTP	Wahkon	—	MNG585051	Nov 2028	16
Walters WWTF	Walters	—	MNG585223	Nov 2028	50
Waltham WWTP	Waltham	—	MNG585380	Nov 2028	9
Wanda WWTP	Wanda	—	MNG585126	Nov 2028	6
Warba WWTP	Warba	—	MNG585345	Nov 2028	38
Wendell WWTP	Wendell	—	MNG585153	Nov 2028	4
Westbrook WWTP	Westbrook Township	—	MNG585127	Nov 2028	32
Wheaton WWTP	Lake Valley Township	—	MNG585044	Nov 2028	15
Williams WWTP	Williams	—	MNG585388	Nov 2028	0
Willow River WWTP	Willow River	—	MNG585054	Nov 2028	4
Wilmont WWTP	Wilmont	—	MNG585200	Nov 2028	32
Winger Dump Site	Winger Township	—	MNG585045	Nov 2028	83
Winton WWTP	Winton	—	MNG585187	Nov 2028	36
Wolf Lake WWTP	Wolf Lake	—	MNG585226	Nov 2028	157
Wood Lake WWTP	Wood Lake Township	—	MNG585107	Nov 2028	8
Woodstock WWTP	Woodstock	—	MNG585192	Nov 2028	0
Kasson WWTP	Kasson	0.63	MN0050725	Dec 2028	0
Mountain Iron WWTP	Mountain Iron	0.28	MN0040835	Dec 2028	1
Morton WWTP	Morton	0.03	MN0051292	Dec 2028	13
Millerville WWTP	Brandon	—	MN0054305	Dec 2028	0

Minnesota permit renewals in 2028: 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 · Anaerobic digester · MGD · 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 2028: Minnesota wastewater plants.” Updated October 26, 2026. https://klarifi.io/facilities/minnesota/permits-expiring/2028

Need a custom cut of the data for a state, a county or a list of plants? Email info@klarifi.io.

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