How many wastewater permits expire in Minnesota in 2027?

35 NPDES permits held by publicly owned wastewater treatment plants in Minnesota expire in 2027, covering a combined average flow of 26 MGD. The busiest month is May 2027 with 5 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 2027?

Rochester Water Reclamation Plant in Rochester, treating about 11.33 MGD under permit MN0024619, expiring Mar 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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Minnesota wastewater permits expiring in 2027

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

35 NPDES permits · 26 MGD combined average flow

35 publicly owned wastewater treatment plants in Minnesota hold NPDES permits that expire during 2027, 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 (27)2028 (234)All Minnesota NPDES permits →

Publicly owned wastewater treatment plants in Minnesota 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)
Albert Lea Wastewater Treatment Facility	Albert Lea	3.06	MN0041092	Jan 2027	Clarifiers, Biogas silos, Biogas balloons	1
Chisholm WWTP	Chisholm	0.64	MN0020117	Jan 2027	Uncovered lagoons, Biogas silos, Biogas balloons	10
Vernon Center	Vernon Center	0.06	MN0030490	Jan 2027	Aerated lagoons	2
Foley WWTP	Foley	—	MN0023451	Jan 2027	Uncovered lagoons	1
Eveleth WWTP	Eveleth	0.32	MN0023337	Feb 2027	Uncovered lagoons, Biogas balloons	30
Biwabik WWTP	Biwabik	—	MN0053279	Feb 2027	Uncovered lagoons	19
Elbow Lake WWTP	Elbow Lake	—	MN0051535	Feb 2027	Uncovered lagoons	4
Rice WWTP	Rice	—	MN0056481	Feb 2027	Uncovered lagoons	4
Rochester Water Reclamation Plant	Rochester	11.33	MN0024619	Mar 2027	Clarifiers, Biogas silos, Biogas balloons	1
Saint Peter WWTP	Saint Peter	1.9	MN0022535	Mar 2027	Uncovered lagoons	15
Cokato WWTP	Cokato	0.47	MN0049204	Mar 2027	Aerated lagoons	8
Dumont WWTP	Dumont	—	MN0064831	Mar 2027	Uncovered lagoons	1
Clara City WWTP	Clara City	0.22	MN0023035	Apr 2027	Biogas balloons	19
Met Council - St Croix Valley WWTP	Oak Park Heights	2.54	MN0029998	May 2027	Clarifiers, Biogas silos	0
Belle Plaine WWTP	Belle Plaine	0.43	MN0022772	May 2027	Uncovered lagoons, Carrousels / oxidation ditches, Biogas balloons	30
Le Center WWTP	Le Center	0.38	MN0023931	May 2027	Biogas silos, Biogas balloons	0
Sacred Heart WWTP	Sacred Heart	0.08	MN0024708	May 2027	—	63
Barrett WWTP	Barrett	—	MN0022713	May 2027	Uncovered lagoons	0
Byron WWTP	Byron	0.5	MN0049239	Jun 2027	—	2
Graceville WWTP	Graceville	—	MN0023540	Jun 2027	Uncovered lagoons	1
Oakland Sanitary District WWTP	Oakland	—	MN0040631	Jun 2027	Uncovered lagoons	0
Preston WWTP	Preston	0.35	MN0020745	Jul 2027	Clarifiers, Biogas silos, Biogas balloons	7
Onamia WWTP	Onamia	—	MN0052906	Jul 2027	Uncovered lagoons	1
Usdi Bia Grnd Prtg Ind Res	Grand Portage	—	MN0025887	Aug 2027	Uncovered lagoons	28
Minnesota City WWTP	Minnesota City	0.01	MN0069817	Aug 2027	—	0
Tracy	Tracy	—	MN0021725	Aug 2027	Uncovered lagoons	17
Whitewater River Regional WWTP	Saint Charles	0.58	MN0046868	Oct 2027	Uncovered lagoons, Carrousels / oxidation ditches, Biogas balloons	13
Otsego WWTP West	Otsego	0.48	MN0066257	Oct 2027	Biogas silos	8
Olivia WWTP	Olivia	0.3	MN0020907	Oct 2027	Biogas silos, Biogas balloons	0
Fosston WWTP	Fosston	—	MN0022128	Oct 2027	Aerated lagoons	26
Plainview-Elgin Sanitary District WWTP	Plainview	0.62	MN0055361	Nov 2027	Biogas silos	2
Brownsville WWTP	Brownsville	0.03	MN0053562	Nov 2027	—	3
Redwood Falls WWTP	Redwood Falls	0.89	MN0020401	Dec 2027	Biogas balloons	26
Granite Falls WWTP	Granite Falls	0.59	MN0021211	Dec 2027	—	9
Richmond WWTP	Richmond	0.09	MN0024597	Dec 2027	Carrousels / oxidation ditches, Biogas silos, Biogas balloons	2

Minnesota 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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