How many wastewater treatment plants are there in Minnesota?

Klarifi tracks 470 publicly owned wastewater treatment plants in Minnesota with a combined average flow of 344 million gallons per day, serving about 3,974,912 residents. 34 of them treat more than 1 MGD and 5 more than 10 MGD.

What is the largest wastewater treatment plant in Minnesota?

Met Council Metropolitan WWTP in Saint Paul is the largest plant in Minnesota by average flow, treating about 164.27 MGD.

What treatment technologies are common in Minnesota?

327 of Minnesota's plants use lagoon systems and 108 have biogas or anaerobic digestion infrastructure, based on Klarifi's aerial imagery review.

How many NPDES permits in Minnesota are up for renewal?

28 permits held by Minnesota plants expire in 2026 and 35 in 2027. Renewals typically bring new limits and trigger upgrade projects.

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Wastewater treatment plants in Minnesota

Name: Wastewater treatment plants in Minnesota
Creator: Klarifi
License: https://klarifi.io/terms-of-service

470 facilities · 344 MGD combined flow

Klarifi tracks 470 publicly owned wastewater treatment plants in Minnesota with a combined average flow of 344 MGD, serving about 3,974,912 residents. 34 plants treat more than 1 MGD and 5 more than 10 MGD; 327 use lagoon systems and 108 have digesters or biogas infrastructure. The largest is Met Council Metropolitan WWTP in Saint Paul at 164.27 MGD. 28 NPDES permits expire this year and 35 next year.

Every plant below links to a profile with average and design flow, the NPDES permit and its expiry, a three-year compliance snapshot and the capital projects planned in its city. Treatment technology and verified contacts are shown with a free Klarifi account. Showing facilities 1–200 of 470 by average flow — browse the rest with the page links below.

468 plant locations in Minnesota; dot size follows average flow. Boundaries: U.S. Census Bureau.

NPDES permits and renewals in Minnesota

Every plant discharges under an NPDES permit that is renewed every five years, usually with tighter limits. The renewal year is the year a plant budgets for upgrades.

All NPDES permits in Minnesota →28 permits expiring in 2026 →35 permits expiring in 2027 →238 permits expiring in 2028 →Find plants near you on the map →

Largest wastewater treatment plants in Minnesota

The 10 largest publicly owned wastewater treatment plants in Minnesota by average flow, with NPDES permit, expiry and three-year violation count. Source: EPA ICIS-NPDES via Klarifi.
Facility	City	Avg flow (MGD)	Design (MGD)	NPDES permit	Expires	Violations (3y)
Met Council Metropolitan WWTP	Saint Paul	164.27	—	MNL029815	Dec 2030	0
Blue Lake Wastewater Treatment Plant	Shakopee	25.9	42	MN0029882	Sep 2029	0
Seneca Wastewater Treatment Plant	Eagan	20.44	38	MN0030007	Nov 2028	6
Met Council - Empire WWTP	Farmington	11.65	—	MNL045845	Dec 2030	0
Rochester Water Reclamation Plant	Rochester	11.39	23.85	MN0024619	Mar 2027	1
Saint Cloud WWTP	St. Cloud	9.41	—	MNL040878	Dec 2030	0
Thief River Falls WWTP	Thief River Falls	6.93	2.99	MN0021431	Aug 2026	29
Met Council - Eagles Point WWTP	Cottage Grove	5.99	11.9	MN0029904	Oct 2023	0
Grand Rapids WWTP	Grand Rapids	5.92	15.2	MN0022080	Jan 2025	7
Moorhead Wastewater Treatment Facility	Moorhead	3.8	9	MN0049069	Jun 2026	0

Treatment technology for each plant is shown with a free Klarifi account. Create one →

The 50 largest plants in Minnesota →EPA enforcement actions in Minnesota →Minnesota capital improvement plans →

Minnesota plants by treatment technology

Lagoon systems (327)Anaerobic digesters and biogas (108)Activated sludge and clarifiers (33)Oxidation ditches (30)

All 470 plants in Minnesota

Facility	City	Flow (MGD)
Met Council Metropolitan WWTP	Saint Paul	164.27
Blue Lake Wastewater Treatment Plant	Shakopee	25.9
Seneca Wastewater Treatment Plant	Eagan	20.44
Met Council - Empire WWTP	Farmington	11.65
Rochester Water Reclamation Plant	Rochester	11.39
Saint Cloud WWTP	St. Cloud	9.41
Thief River Falls WWTP	Thief River Falls	6.93
Met Council - Eagles Point WWTP	Cottage Grove	5.99
Grand Rapids WWTP	Grand Rapids	5.92
Moorhead Wastewater Treatment Facility	Moorhead	3.8
Owatonna WWTP	Owatonna	3.32
Alexandria Lake Area Sanitary District	Alexandria	2.75
Met Council - St Croix Valley WWTP	Oak Park Heights	2.44
Whitewater River Regional WWTP	Saint Charles	2.35
Mahnomen WWTP	Mahnomen	2.32
Marshall WWTP	Marshall	2.15
Litchfield WWTP	Litchfield	1.94
Northfield WWTP	Northfield	1.86
Red Wing WWTP	Red Wing	1.65
Saint Peter WWTP	Saint Peter	1.46
Met Council Hastings WWTP	Hastings	1.42
Fergus Falls WWTP	Fergus Falls	1.39
Elk River WWTP	Elk River	1.31
Barnesville WWTP	Barnesville	1.26
Rogers WWTP	Rogers	1.16
Cold Spring WWTP	Cold Spring	1.11
Long Prairie WWTP	Long Prairie	1.1
Buffalo WWTP	Buffalo	1.08
Monticello WWTP	Monticello	1.04
Detroit Lakes WWTP	Detroit Lakes	1.04
Virginia WWTP	Virginia	1.03
Saint Michael WWTP	Saint Michael	1.03
Bemidji WWTP	Bemidji	1.02
Chisago Lakes Joint Stc	Chisago City	1.02
Grove City WWTP	Grove City	0.98
Redwood Falls WWTP	Redwood Falls	0.91
Clarkfield WWTP	Clarkfield	0.91
Becker WWTP	Becker	0.9
Montevideo WWTP	Montevideo	0.88
Luverne WWTP	Luverne	0.83
Smsc Water Reclamation Facili	Prior Lake	0.82
Fortune Bay Resort & Casino	Tower	0.78
Two Harbors WWTP	Two Harbors	0.76
Nkasd WWTP	International Falls	0.75
Big Lake WWTP	Big Lake	0.73
New Prague WWTP	New Prague	0.68
Cambridge WWTP	Cambridge	0.68
Annandale/maple Lake WWTF	Maple Lake	0.67
Winnebago WWTP	Winnebago	0.66
Crystal Lake Flocculation Treatment Facility	Robbinsdale	0.66
Kasson WWTP	Kasson	0.63
Plainview-Elgin Sanitary District WWTP	Plainview	0.63
Ely WWTP	Ely	0.61
Pine City	Pine City	0.61
Saint James	Saint James	0.59
Glencoe WWTP	Glencoe	0.57
Delano WWTP	Delano	0.57
Albertville WWTP	Albertville	0.56
Stewartville WWTP	Stewartville	0.54
Zumbrota WWTP	Zumbrota	0.54
Otsego East WWTP	Rogers	0.53
Chisholm WWTP	Chisholm	0.51
Roseau WWTP	Roseau	0.5
Byron WWTP	Byron	0.5
Green Lake Sswd	Spicer	0.5
Grand Marais	Grand Marais	0.49
Otsego WWTP West	Otsego	0.49
Lake City WWTP	Lake City	0.48
Princeton	Princeton	0.43
Sauk Centre WWTP	Sauk Centre	0.43
Le Center WWTP	Le Center	0.43
Spring Valley WWTP	Spring Valley	0.41
North Branch WWTP	North Branch	0.41
Belle Plaine WWTP	Belle Plaine	0.39
Saint Francis WWTP	Saint Francis	0.38
Pelican Rapids WWTP	Pelican Rapids	0.38
Preston WWTP	Preston	0.37
Zimmerman WWTP	Zimmerman	0.35
Cokato WWTP	Cokato	0.35
Granite Falls WWTP	Granite Falls	0.34
Montrose WWTP	Montrose	0.33
Watertown WWTP	Watertown	0.33
Hoyt Lakes WWTP	Hoyt Lakes	0.31
Eveleth WWTP	Eveleth	0.31
Mille Lacs WWTF	Onamia	0.3
Rockford WWTP	Rockford	0.29
Mountain Iron WWTP	Mountain Iron	0.28
Royalton WWTP	Motley	0.28
Wadena WWTP	Wadena	0.28
Lonsdale WWTP	Lonsdale	0.28
Olivia WWTP	Olivia	0.27
Coleraine-Bovey-Taconite Joint WWTP	Coleraine	0.27
Mora WWTP	Mora	0.27
Cannon Falls_wwtf	Cannon Falls	0.26
Gilbert WWTP	Gilbert	0.26
Staples WWTP	Staples	0.26
Hector-Treatment Plant	Hector	0.25
Aurora WWTP	Aurora	0.24
Hinckley WWTP	Hinckley	0.23
Pine Island WWTP	Pine Island	0.23
Spring Grove WWTP	Spring Grove	0.23
Winsted	Winsted	0.23
Babbitt WWTP	Babbitt	0.2
Butterfield	Butterfield	0.2
Chatfield WWTP	Chatfield	0.19
Sherburn WWTP	Sherburn	0.19
Clara City WWTP	Clara City	0.19
Caledonia WWTP	Caledonia	0.19
Clear Lake/clearwater WWTP	Clear Lake	0.19
Starbuck WWTP	Starbuck	0.18
Lake Crystal WWTP	Lake Crystal	0.18
Lakefield WWTP	Lakefield	0.18
Kenyon WWTP	Kenyon	0.18
Hawley-Treatment Plant #1	Hawley	0.17
Wabasha WWTP	Wabasha	0.17
Appleton WWTP	Appleton	0.16
Warren WWTP	Warren	0.16
Cologne WWTP	Cologne	0.16
Blooming Prairie WWTP	Blooming Prairie	0.15
Mayer WWTP	Mayer	0.14
Braham WWTP	Braham	0.14
Amboy WWTP	Amboy	0.14
Callaway WWTP	Callaway	0.13
Wanamingo	Wanamingo	0.12
Royalton WWTP	Royalton	0.11
Naytahwaush Wwsl	Naytahwaush	0.11
Rushford WWTP	Rushford	0.11
Racine	Racine	0.11
East Gull Lake WWTP	East Gull Lake	0.11
Adams WWTP	Adams	0.1
Oronoco WWTP	Oronoco	0.1
Pine River Area Sanitary District	Pine River	0.1
White Earth Wwsl	White Earth	0.09
Lester Prairie WWTP	Lester Prairie	0.09
Avon WWTP	Avon	0.08
Richmond WWTP	Richmond	0.08
Kerkhoven WWTP	Kerkhoven	0.08
Holland WWTP	Holland	0.08
Lewiston WWTP	Lewiston	0.08
Medford WWTP	Medford	0.08
Goodhue WWTP	Goodhue	0.07
Karlstad WWTP	Karlstad	0.07
Randall WWTP	Randall	0.07
Ogema WWTP	Ogema	0.07
Hokah-Well #1 Entry Point	Hokah	0.07
Crosslake WWTP	Crosslake	0.06
Houston	Houston	0.06
Harmony WWTP	Harmony	0.06
Holdingford WWTP	Holdingford	0.06
Morristown WWTP	Morristown	0.06
Saint Clair WWTP	Saint Clair	0.06
Brownton WWTP	Brownton	0.05
Mabel WWTP	Mabel	0.05
Sacred Heart WWTP	Sacred Heart	0.05
Darwin WWTP	Darwin	0.04
Halstad Municipal Utilities	Halstad	0.04
Ogilvie WWTP	Ogilvie	0.04
Vernon Center	Vernon Center	0.04
Maynard WWTP	Maynard	0.04
Pennock WWTP	Pennock	0.03
Morton WWTP	Morton	0.03
Orr WWTP	Orr	0.03
Brownsville WWTP	Brownsville	0.03
Vermillion WWTP	Vermillion	0.02
Swanville WWTP	Swanville	0.02
Bejou-Well #2 Entry Point	Bejou	0.02
Urbank WWTP	Clitherall	0.02
Comfrey WWTP	Comfrey	0.02
Harris WWTP	Harris	0.02
Lake Henry WWTP	Paynesville	0.02
Nett Lake Wwsl	Nett Lake	0.02
Peterson WWTP	Peterson	0.02
Isd 363 - Indus Public School	Birchdale	0.02
Nerstrand WWTP	Nerstrand	0.01
Greenfield WWTP	Greenfield	0.01
Minnesota City WWTP	Minnesota City	0.01
Palisade WWTP	Palisade	0.01
Effie WWTP	Effie	0.0085
Ostrander	Ostrander	0.0074
Sobieski WWTP	Swan River	0.007
Hammond WWTP	Zumbro Falls	0.0065
Tamarack WWTP	Tamarack	0.0054
Lasalle	La Salle	0.0041
St George Community WW System	New Ulm	0.0025
Laketown Community WWTP	Chaska	0.0024
Delft Sanitary District WWTP	Windom	0.0021
7-Clans Casino WWTP	Thief River Falls	—
Ada WWTP	Ada	—
Adrian WWTP	Adrian	—
Albany	Albany	—
Albert Lea Wastewater Treatment Facility	Albert Lea	—
Alberta WWTP	Alberta	—
Alden WWTP	Alden	—
Alvarado WWTP	Alvarado	—
Argyle WWTP	Argyle	—
Arlington WWTP	Arlington	—
Askov WWTP	Askov	—
Atwater	Atwater	—
Audubon	Audubon	—
Avoca & Iona WWTP	Iona	—

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Wastewater treatment in Minnesota: 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: WWTP · POTW · MGD · NPDES permit · Biological nutrient removal · Tertiary treatment · 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. “Wastewater treatment plants in Minnesota.” Updated October 26, 2026. https://klarifi.io/facilities/minnesota

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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