Minnesota wastewater permits expiring in 2028
234 NPDES permits · 27 MGD combined average flow
234 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.
| Facility | City | Avg flow (MGD) | NPDES permit | Expires | Technology | Violations (3y) |
|---|---|---|---|---|---|---|
| Appleton WWTP | Appleton | 0.15 | MN0021890 | Jan 2028 | Carrousels / oxidation ditches, Biogas balloons | 15 |
| Lake Henry WWTP | Paynesville | 0.03 | MN0020885 | Jan 2028 | Uncovered lagoons | 34 |
| Hammond WWTP | Zumbro Falls | 0.0058 | MN0066940 | Jan 2028 | — | 0 |
| Carlos WWTP | Carlos | — | MN0023019 | Jan 2028 | Uncovered lagoons | 3 |
| Hampton WWTP | Hampton | — | MN0021946 | Jan 2028 | Aerated lagoons | 3 |
| Sauk Centre WWTP | Sauk Centre | 0.56 | MN0024821 | Feb 2028 | Biogas balloons | 13 |
| Pine Island WWTP | Pine Island | 0.23 | MN0024511 | Feb 2028 | Clarifiers, Biogas silos, Biogas balloons | 4 |
| Glenville WWTP | Glenville | — | MN0021245 | Feb 2028 | Uncovered lagoons | 25 |
| Zumbro Falls WWTP | Zumbro Falls | — | MN0051004 | Feb 2028 | Uncovered lagoons | 0 |
| Kenyon WWTP | Kenyon | 0.21 | MN0021628 | Mar 2028 | Biogas balloons | 19 |
| Crosslake WWTP | Crosslake | 0.06 | MN0064882 | Mar 2028 | — | 25 |
| Ogilvie WWTP | Ogilvie | 0.04 | MN0021997 | Mar 2028 | — | 14 |
| Bagley WWTP | Bagley | — | MN0022691 | Mar 2028 | Uncovered lagoons | 9 |
| Starbuck WWTP | Starbuck | 0.27 | MN0021415 | May 2028 | Biogas balloons | 0 |
| Bellechester WWTP | Bellchester | — | MN0022764 | May 2028 | Uncovered lagoons | 1 |
| Brewster WWTP | Brewster | — | MN0021750 | May 2028 | Uncovered lagoons | 4 |
| Wadena WWTP | Wadena | 0.29 | MN0020672 | Jun 2028 | Uncovered lagoons, Carrousels / oxidation ditches, Biogas silos, Biogas balloons | 1 |
| Morristown WWTP | Morristown | 0.13 | MN0025895 | Jun 2028 | Biogas balloons | 0 |
| Lester Prairie WWTP | Lester Prairie | 0.08 | MN0023957 | Jun 2028 | Carrousels / oxidation ditches, Biogas balloons | 0 |
| Lewiston WWTP | Lewiston | 0.07 | MN0023965 | Jul 2028 | Uncovered lagoons | 14 |
| Saint Clair WWTP | Saint Clair | 0.06 | MN0024716 | Jul 2028 | Biogas balloons | 0 |
| Morris WWTP | Morris | — | MN0021318 | Jul 2028 | Uncovered lagoons | 8 |
| Fergus Falls WWTP | Fergus Falls | 1.44 | MN0050628 | Aug 2028 | Clarifiers, Biogas silos | 2 |
| Spring Valley WWTP | Spring Valley | 0.48 | MN0051934 | Aug 2028 | Carrousels / oxidation ditches | 18 |
| Glyndon | Glyndon | — | MN0020630 | Aug 2028 | Uncovered lagoons | 6 |
| Harmony WWTP | Harmony | 0.05 | MN0022322 | Sep 2028 | Biogas balloons | 1 |
| Saint James | Saint James | 0.51 | MN0024759 | Oct 2028 | Clarifiers, Biogas silos, Biogas balloons | 2 |
| Miltona WWTP | Miltona | — | MN0024155 | Oct 2028 | Uncovered lagoons | 13 |
| Seneca Wastewater Treatment Plant | Eagan | 20.92 | MN0030007 | Nov 2028 | Clarifiers | 6 |
| Darwin WWTP | Darwin | 0.05 | MNG585150 | Nov 2028 | Uncovered lagoons | 8 |
| Pennock WWTP | Pennock | 0.03 | MNG585104 | Nov 2028 | Uncovered lagoons | 12 |
| 7-Clans Casino WWTP | Thief River Falls | — | MNG585172 | Nov 2028 | Uncovered lagoons | 1 |
| Ada WWTP | Ada | — | MNG585095 | Nov 2028 | Uncovered lagoons | 12 |
| Alberta WWTP | Alberta | — | MNG585002 | Nov 2028 | Aerated lagoons, Uncovered lagoons | 2 |
| Alden WWTP | Alden | — | MNG585118 | Nov 2028 | Uncovered lagoons | 3 |
| Alvarado WWTP | Alvarado | — | MNG585171 | Nov 2028 | Uncovered lagoons | 1 |
| Argyle WWTP | Argyle | — | MNG585140 | Nov 2028 | Uncovered lagoons | 9 |
| Askov WWTP | Askov | — | MNG585229 | Nov 2028 | Uncovered lagoons | 0 |
| Audubon | Audubon | — | MNG585148 | Nov 2028 | Uncovered lagoons | 50 |
| Avoca & Iona WWTP | Iona | — | MNG585165 | Nov 2028 | Uncovered lagoons | 10 |
| Badger Wastewater Treatment Plant | Badger | — | MNG585155 | Nov 2028 | Uncovered lagoons | 27 |
| Barnum-Well #2 Entry Point | Barnum | — | MNG585142 | Nov 2028 | Uncovered lagoons | 2 |
| Baudette WWTP | Baudette | — | MNG585174 | Nov 2028 | Uncovered lagoons | 7 |
| Beaver Creek WWTP | Beaver Creek Township | — | MNG585055 | Nov 2028 | Uncovered lagoons | 30 |
| Bellingham WWTP | Bellingham | — | MNG585152 | Nov 2028 | Uncovered lagoons | 6 |
| Belview WWTP | Belview | — | MNG585003 | Nov 2028 | Uncovered lagoons | 4 |
| Bertha WWTP | Bertha | — | MNG585371 | Nov 2028 | Uncovered lagoons | 3 |
| Big Falls | Big Falls | — | MNG585135 | Nov 2028 | Uncovered lagoons | 13 |
| Bigelow WWTP | Bigelow Township | — | MNG585224 | Nov 2028 | Uncovered lagoons | 0 |
| Bigfork | Bigfork | — | MNG585363 | Nov 2028 | Uncovered lagoons | 18 |
| Bird Island WWTP | Bird Island | — | MNG585390 | Nov 2028 | Uncovered lagoons | 10 |
| Blomkest Svea Sewer Board WWTP | Blomkest | — | MNG585372 | Nov 2028 | Uncovered lagoons | 0 |
| Brooten WWTP | Brooten | — | MNG585271 | Nov 2028 | Uncovered lagoons | 1 |
| Buffalo Lake WWTP | Buffalo Lake | — | MNG585373 | Nov 2028 | Uncovered lagoons | 1 |
| Campbell | Campbell | — | MNG585130 | Nov 2028 | Uncovered lagoons | 9 |
| Canby WWTP | Canby | — | MNG585154 | Nov 2028 | Uncovered lagoons | 6 |
| Ceylon WWTP | Ceylon | — | MNG585006 | Nov 2028 | Uncovered lagoons | 135 |
| Chokio WWTP | Chokio | — | MNG585007 | Nov 2028 | Uncovered lagoons | 20 |
| Clarkfield WWTP | Clarkfield | — | MNG585093 | Nov 2028 | Aerated lagoons, Uncovered lagoons | 33 |
| Clarks Grove WWTP | Clarks Grove | — | MNG585067 | Nov 2028 | Uncovered lagoons | 6 |
| Clearbrook WWTP | Leon Township | — | MNG585098 | Nov 2028 | Uncovered lagoons | 7 |
| Clements WWTP | Clements | — | MNG585094 | Nov 2028 | Uncovered lagoons | 2 |
| Cleveland WWTP | Cleveland | — | MNG585009 | Nov 2028 | Uncovered lagoons | 5 |
| Climax WWTP | Climax | — | MNG585169 | Nov 2028 | Uncovered lagoons | 0 |
| Clinton WWTP | Clinton | — | MNG585193 | Nov 2028 | Clarifiers, Uncovered lagoons | 2 |
| Clontarf WWTP | Clontarf Township | — | MNG585108 | Nov 2028 | Uncovered lagoons | 8 |
| Community Of Roseland WWTP | Blomkest | — | MNG585393 | Nov 2028 | Uncovered lagoons | 0 |
| Comstock WWTP | Comstock | — | MNG585131 | Nov 2028 | Uncovered lagoons | 4 |
| Conger WWTP | Conger | — | MNG585222 | Nov 2028 | Uncovered lagoons | 14 |
| Cook WWTP | Cook | — | MNG585179 | Nov 2028 | Uncovered lagoons | 0 |
| Cosmos WWTP | Cosmos Township | — | MNG585056 | Nov 2028 | Uncovered lagoons | 11 |
| Cottonwood WWTP | Cottonwood | — | MNG585010 | Nov 2028 | — | 13 |
| Currie City Of | Currie | — | MNG585221 | Nov 2028 | Uncovered lagoons | 0 |
| Danube WWTP | Danube | — | MNG585057 | Nov 2028 | Uncovered lagoons | 9 |
| Danvers WWTP | Danvers | — | MNG585119 | Nov 2028 | Uncovered lagoons | 19 |
| Deer Creek WWTP | Deer Creek | — | MNG585180 | Nov 2028 | Uncovered lagoons | 0 |
| Deer River WWTP | Deer River | — | MNG585181 | Nov 2028 | Uncovered lagoons | 8 |
| Degraff WWTP | De Graff | — | MNG585398 | Nov 2028 | Uncovered lagoons | 22 |
| Delavan WWTP | Delavan | — | MNG585109 | Nov 2028 | Uncovered lagoons | 1 |
| Dexter WWTP | Dexter | — | MNG585228 | Nov 2028 | Uncovered lagoons | 1 |
| Dunnell WWTP | Dunnell | — | MNG585279 | Nov 2028 | Uncovered lagoons | 40 |
| Eagle Bend WWTP | Eagle Bend | — | MNG585383 | Nov 2028 | Clarifiers, Biogas balloons | 8 |
| Echo WWTP | Echo | — | MNG585059 | Nov 2028 | Uncovered lagoons | 35 |
| Elizabeth WWTP | Elizabeth Township | — | MNG585012 | Nov 2028 | Uncovered lagoons | 1 |
| Elkton WWTP | Elkton | — | MNG585013 | Nov 2028 | Uncovered lagoons | 11 |
| Elmore WWTP | Elmore | — | MNG585110 | Nov 2028 | Uncovered lagoons | 5 |
| Elysian | Elysian | — | MNG585285 | Nov 2028 | Uncovered lagoons | 3 |
| Evan WWTP | Evan | — | MNG585202 | Nov 2028 | Uncovered lagoons | 0 |
| Evansville WWTP | Evansville | — | MNG585074 | Nov 2028 | Uncovered lagoons | 4 |
| Fairfax WWTP | Fairfax | — | MNG585060 | Nov 2028 | Uncovered lagoons | 77 |
| Farwell Kensington Sanitary D | Kensington | — | MNG585220 | Nov 2028 | Uncovered lagoons | 6 |
| Felton WWTP | Felton Township | — | MNG585149 | Nov 2028 | Uncovered lagoons | 1 |
| Fertile WWTP | Fertile | — | MNG585138 | Nov 2028 | Uncovered lagoons | 0 |
| Finlayson WWTP | Finlayson | — | MNG585203 | Nov 2028 | Uncovered lagoons | 2 |
| Fisher WWTP | Fisher Township | — | MNG585170 | Nov 2028 | Uncovered lagoons | 58 |
| Flensburg WWTP | Flensburg | — | MNG585016 | Nov 2028 | Uncovered lagoons | 19 |
| Floodwood WWTP | Floodwood | — | MNG585048 | Nov 2028 | Uncovered lagoons | 18 |
| Foreston WWTP | Foreston | — | MNG585017 | Nov 2028 | Uncovered lagoons | 0 |
| Freeborn WWTP | Freeborn | — | MNG585018 | Nov 2028 | Uncovered lagoons | 11 |
| Freeport WWTP | Freeport | — | MNG585019 | Nov 2028 | Uncovered lagoons | 5 |
| Frost WWTP | Frost | — | MNG585120 | Nov 2028 | Uncovered lagoons | 19 |
| Fulda WWTP | Fulda | — | MNG585188 | Nov 2028 | Uncovered lagoons | 11 |
| Fulda WWTP | Dundee | — | MNG585349 | Nov 2028 | Uncovered lagoons | 17 |
| Garfield WWTP | Garfield | — | MNG585158 | Nov 2028 | Uncovered lagoons | 1 |
| Gary WWTP | Gary | — | MNG585175 | Nov 2028 | Uncovered lagoons | 163 |
| Gaylord WWTP | Gaylord | — | MNG585204 | Nov 2028 | Uncovered lagoons | 42 |
| Gem Sanitary District | Meire Grove | — | MNG585205 | Nov 2028 | Uncovered lagoons | 7 |
| Geneva WWTP | Geneva | — | MNG585292 | Nov 2028 | Uncovered lagoons | 4 |
| Georgetown | Georgetown | — | MNG585132 | Nov 2028 | Uncovered lagoons | 79 |
| Ghent | Ghent | — | MNG585121 | Nov 2028 | Uncovered lagoons | 0 |
| Gilman WWTP | Gilman | — | MNG585021 | Nov 2028 | Uncovered lagoons | 2 |
| Goodridge WWTP | Goodridge | — | MNG585022 | Nov 2028 | Uncovered lagoons | 1 |
| Granada WWTP | Granada | — | MNG585023 | Nov 2028 | Uncovered lagoons | 26 |
| Greenbush WWTP | Greenbush | — | MNG585156 | Nov 2028 | Uncovered lagoons | 26 |
| Hallock WWTP | Hallock Township | — | MNG585147 | Nov 2028 | Uncovered lagoons | 0 |
| Hamburg WWTP | Young America Township | — | MNG585386 | Nov 2028 | Uncovered lagoons | 24 |
| Hancock WWTP | Hancock | — | MNG585299 | Nov 2028 | Uncovered lagoons | 31 |
| Hanley Falls WWTP | Hanley Falls | — | MNG585122 | Nov 2028 | Uncovered lagoons | 14 |
| Hardwick WWTP | Hardwick | — | MNG585194 | Nov 2028 | Uncovered lagoons | 29 |
| Hartland Wastewater Treatment Plant | Hartland | — | MNG585102 | Nov 2028 | Uncovered lagoons | 79 |
| Hayward WWTP | Hayward | — | MNG585391 | Nov 2028 | Aerated lagoons, Uncovered lagoons | 1 |
| Hendricks WWTP | Hendricks | — | MNG585377 | Nov 2028 | Uncovered lagoons | 0 |
| Hendrum WWTP | Hendrum Township | — | MNG585176 | Nov 2028 | Uncovered lagoons | 23 |
| Hewitt WWTP | Hewitt | — | MNG585024 | Nov 2028 | Uncovered lagoons | 0 |
| Hill City WWTP | Hill City | — | MNG585182 | Nov 2028 | Uncovered lagoons | 4 |
| Hills WWTP | Hills | — | MNG585196 | Nov 2028 | Uncovered lagoons | 23 |
| Hitterdal WWTP | Hitterdal | — | MNG585178 | Nov 2028 | Uncovered lagoons | 0 |
| Hollandale WWTP | Hollandale | — | MNG585374 | Nov 2028 | Uncovered lagoons | 92 |
| Ivanhoe WWTP | Ivanhoe | — | MNG585103 | Nov 2028 | Uncovered lagoons | 52 |
| Janesville WWTP | Janesville Township | — | MNG585025 | Nov 2028 | Uncovered lagoons | 0 |
| Jasper WWTP | Jasper | — | MNG585026 | Nov 2028 | Uncovered lagoons | 6 |
| Jeffers WWTP | Jeffers | — | MNG585111 | Nov 2028 | Uncovered lagoons | 4 |
| Karlstad WWTP | Karlstad | — | MNG585146 | Nov 2028 | Uncovered lagoons | 19 |
| Kelliher WWTP | Kelliher | — | MNG585068 | Nov 2028 | Uncovered lagoons | 174 |
| Kellogg WWTP | Kellogg | — | MNG585027 | Nov 2028 | Uncovered lagoons | 0 |
| Kennedy WWTP | Kennedy | — | MNG585028 | Nov 2028 | Uncovered lagoons | 3 |
| Kettle River | Kettle River | — | MNG585183 | Nov 2028 | Uncovered lagoons | 9 |
| Kiester WWTP | Kiester Township | — | MNG585097 | Nov 2028 | Uncovered lagoons | 8 |
| Kilkenny WWTP | Kilkenny | — | MNG585084 | Nov 2028 | Uncovered lagoons | 44 |
| Lac Qui Parle Valley | Madison | — | MNG585091 | Nov 2028 | Uncovered lagoons | 54 |
| Lake Bronson WWTP | Lake Bronson | — | MNG585029 | Nov 2028 | Uncovered lagoons | 1 |
| Lake Park WWTP | Lake Park | — | MNG585157 | Nov 2028 | Uncovered lagoons | 6 |
| Lake Wilson WWTP | Lake Wilson | — | MNG585061 | Nov 2028 | Uncovered lagoons | 2 |
| Lamberton WWTP | Lamberton Township | — | MNG585100 | Nov 2028 | Uncovered lagoons | 2 |
| Lancaster WWTP | Lancaster | — | MNG585066 | Nov 2028 | Uncovered lagoons | 21 |
| Leota Sanitary District WWTP | Leota | — | MNG585219 | Nov 2028 | Uncovered lagoons | 40 |
| Lewisville WWTP | Lewisville | — | MNG585314 | Nov 2028 | Uncovered lagoons | 16 |
| Lismore WWTP | Lismore Township | — | MNG585076 | Nov 2028 | Uncovered lagoons | 29 |
| Littlefork WWTP | Littlefork | — | MNG585081 | Nov 2028 | Uncovered lagoons | 10 |
| Lowry WWTP | Lowry | — | MNG585123 | Nov 2028 | Uncovered lagoons | 0 |
| Lucan WWTP | Lucan | — | MNG585112 | Nov 2028 | Uncovered lagoons | 0 |
| Lynd WWTP | Lynd | — | MNG585030 | Nov 2028 | Uncovered lagoons | 35 |
| Magnolia WWTP | Magnolia | — | MNG585190 | Nov 2028 | Uncovered lagoons | 0 |
| Mapleton WWTP | Mapleton | — | MNG585089 | Nov 2028 | — | 11 |
| Marietta WWTP | Marietta | — | MNG585160 | Nov 2028 | Uncovered lagoons | 4 |
| Mcgregor WWTP | Mcgregor | — | MNG585405 | Nov 2028 | Uncovered lagoons | 0 |
| Mcintosh WWTP | Mcintosh | — | MNG585031 | Nov 2028 | Uncovered lagoons | 3 |
| Mckinley WWTP | Mckinley | — | MNG585367 | Nov 2028 | Uncovered lagoons | 7 |
| Meriden Township WWTP | Owatonna | — | MNG585319 | Nov 2028 | Uncovered lagoons | 64 |
| Middle River WWTP | Middle River | — | MNG585163 | Nov 2028 | Uncovered lagoons | 20 |
| Milan WWTP | Milan | — | MNG585141 | Nov 2028 | Uncovered lagoons | 7 |
| Milroy | Milroy | — | MNG585124 | Nov 2028 | Uncovered lagoons | 39 |
| Minneota WWTP | Minneota | — | MNG585033 | Nov 2028 | Uncovered lagoons | 17 |
| Moose Lake WWTP | Moose Lake | — | MNG585401 | Nov 2028 | Uncovered lagoons | 17 |
| Newfolden WWTP | New Folden Township | — | MNG585145 | Nov 2028 | Uncovered lagoons | 27 |
| Nicollet WWTP | Nicollet | — | MNG585037 | Nov 2028 | Aerated lagoons, Uncovered lagoons | 5 |
| Nielsville WWTP | Nielsville | — | MNG585166 | Nov 2028 | Uncovered lagoons | 4 |
| Northome WWTP | Northome | — | MNG585185 | Nov 2028 | Uncovered lagoons | 1 |
| Odessa WWTP | Odessa Township | — | MNG585099 | Nov 2028 | Uncovered lagoons | 49 |
| Odin-Ormsby WWTP | Odin | — | MNG585369 | Nov 2028 | Uncovered lagoons | 0 |
| Oklee WWTP | Oklee | — | MNG585038 | Nov 2028 | Uncovered lagoons | 1 |
| Ortonville WWTP | Ortonville | — | MNG585151 | Nov 2028 | Uncovered lagoons | 9 |
| Osakis WWTP | Osakis | — | MN0020028 | Nov 2028 | Uncovered lagoons | 8 |
| Oslo WWTP | Oslo | — | MNG585379 | Nov 2028 | Uncovered lagoons | 0 |
| Pease WWTP | Pease | — | MNG585167 | Nov 2028 | Uncovered lagoons | 9 |
| Pemberton WWTP | Pemberton | — | MNG585075 | Nov 2028 | Uncovered lagoons | 0 |
| Perley WWTP | Perley | — | MNG585326 | Nov 2028 | Uncovered lagoons | 44 |
| Plummer | Plummer | — | MNG585327 | Nov 2028 | Uncovered lagoons | 0 |
| Porter WWTP | Porter | — | MNG585128 | Nov 2028 | Uncovered lagoons | 12 |
| Raymond | Raymond | — | MNG585197 | Nov 2028 | Uncovered lagoons | 4 |
| Red Lake Falls WWTP | Red Lake Falls Township | — | MNG585161 | Nov 2028 | Uncovered lagoons | 0 |
| Remer WWTP | Remer | — | MNG585210 | Nov 2028 | Uncovered lagoons | 1 |
| Revere WWTP | Revere | — | MNG585114 | Nov 2028 | Uncovered lagoons | 1 |
| Rollingstone WWTP | Rollingstone Township | — | MNG585078 | Nov 2028 | Uncovered lagoons | 0 |
| Rothsay WWTP | Rothsay | — | MNG585064 | Nov 2028 | Aerated lagoons | 1 |
| Rushmore WWTP | Rushmore | — | MNG585201 | Nov 2028 | Uncovered lagoons | 20 |
| Russell WWTP | Russell | — | MNG585062 | Nov 2028 | Uncovered lagoons | 117 |
| Ruthton WWTP | Ruthton | — | MNG585105 | Nov 2028 | Uncovered lagoons | 8 |
| Sabin WWTP | Sabin | — | MNG585133 | Nov 2028 | Uncovered lagoons | 20 |
| Saint Martin WWTP | Saint Martin | — | MNG585402 | Nov 2028 | Uncovered lagoons | 11 |
| Sanborn Wastewater Treatment Plant | Sanborn | — | MNG585115 | Nov 2028 | Uncovered lagoons | 30 |
| Sargeant WWTP | Sargeant Township | — | MNG585214 | Nov 2028 | Uncovered lagoons | 4 |
| Searles WWTP | Searles | — | MNG585080 | Nov 2028 | Uncovered lagoons | 2 |
| Serpent Lake WWTP | Crosby | — | MNG585215 | Nov 2028 | Uncovered lagoons | 1 |
| Shafer WWTP | Shafer | — | MNG585047 | Nov 2028 | Uncovered lagoons | 3 |
| Shelly WWTP | Shelly | — | MNG585227 | Nov 2028 | Uncovered lagoons | 16 |
| Shetek Area Water & Sewer District WWTP | Currie | — | MNG585403 | Nov 2028 | Uncovered lagoons | 1 |
| Silver Lake WWTP | Lakeville | — | MNG585164 | Nov 2028 | Uncovered lagoons | 0 |
| Slayton WWTP | Slayton | — | MNG585191 | Nov 2028 | Aerated lagoons | 28 |
| Sleepy Eye WWTP | Sleepy Eye | — | MNG585041 | Nov 2028 | Uncovered lagoons | 9 |
| Sobieski WWTP | Swan River | — | MNG585217 | Nov 2028 | Aerated lagoons, Uncovered lagoons | 9 |
| Steen WWTP | Steen | — | MNG585199 | Nov 2028 | Uncovered lagoons | 5 |
| Stockton WWTP | Stockton | — | MNG585079 | Nov 2028 | Uncovered lagoons | 2 |
| Storden WWTP | Storden Township | — | MNG585106 | Nov 2028 | Uncovered lagoons | 4 |
| Sunburg WWTP | Sunburg | — | MNG585125 | Nov 2028 | Uncovered lagoons | 28 |
| Taunton WWTP | Taunton | — | MNG585090 | Nov 2028 | Uncovered lagoons | 4 |
| Tower/breitung WWTP | Soudan | — | MNG585186 | Nov 2028 | Uncovered lagoons | 0 |
| Twin Lakes WWTP | Twin Lakes | — | MNG585042 | Nov 2028 | Uncovered lagoons | 74 |
| Twin Valley | Twin Valley | — | MNG585137 | Nov 2028 | Uncovered lagoons | 2 |
| Tyler WWTP | Tyler | — | MNG585116 | Nov 2028 | Uncovered lagoons | 3 |
| Ulen WWTP | Ulen Township | — | MNG585088 | Nov 2028 | Aerated lagoons, Uncovered lagoons | 20 |
| Urbank WWTP | Clitherall | — | MNG585343 | Nov 2028 | Uncovered lagoons | 2 |
| Vesta WWTP | Vesta | — | MNG585043 | Nov 2028 | Uncovered lagoons | 22 |
| Viking Wastewater Treatment I | Viking | — | MNG585370 | Nov 2028 | Uncovered lagoons | 1 |
| Wahkon WWTP | Wahkon | — | MNG585051 | Nov 2028 | Uncovered lagoons | 16 |
| Walters WWTF | Walters | — | MNG585223 | Nov 2028 | Uncovered lagoons | 50 |
| Waltham WWTP | Waltham | — | MNG585380 | Nov 2028 | Uncovered lagoons | 11 |
| Wanda WWTP | Wanda | — | MNG585126 | Nov 2028 | Uncovered lagoons | 6 |
| Warba WWTP | Warba | — | MNG585345 | Nov 2028 | Uncovered lagoons | 53 |
| Warren WWTP | Warren | — | MNG585073 | Nov 2028 | Uncovered lagoons | 6 |
| Wendell WWTP | Wendell | — | MNG585153 | Nov 2028 | Uncovered lagoons | 4 |
| Wheaton WWTP | Lake Valley Township | — | MNG585044 | Nov 2028 | Uncovered lagoons | 15 |
| Williams WWTP | Williams | — | MNG585388 | Nov 2028 | Uncovered lagoons | 0 |
| Willow River WWTP | Willow River | — | MNG585054 | Nov 2028 | Uncovered lagoons | 4 |
| Wilmont WWTP | Wilmont | — | MNG585200 | Nov 2028 | Uncovered lagoons | 31 |
| Winger Dump Site | Winger Township | — | MNG585045 | Nov 2028 | Uncovered lagoons | 87 |
| Winton WWTP | Winton | — | MNG585187 | Nov 2028 | Uncovered lagoons | 36 |
| Wolf Lake WWTP | Wolf Lake | — | MNG585226 | Nov 2028 | Uncovered lagoons | 157 |
| Wood Lake WWTP | Wood Lake Township | — | MNG585107 | Nov 2028 | — | 8 |
| Woodstock WWTP | Woodstock | — | MNG585192 | Nov 2028 | Uncovered lagoons | 0 |
| Kasson WWTP | Kasson | 0.64 | MN0050725 | Dec 2028 | Carrousels / oxidation ditches, Biogas silos, Biogas balloons | 0 |
| Mountain Iron WWTP | Mountain Iron | 0.28 | MN0040835 | Dec 2028 | Biogas balloons | 1 |
| Morton WWTP | Morton | 0.04 | MN0051292 | Dec 2028 | Aerated lagoons | 13 |
| Millerville WWTP | Brandon | — | MN0054305 | Dec 2028 | Uncovered lagoons | 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 September 11, 2026.