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Iowa wastewater permits expiring in 2026

71 NPDES permits · 39 MGD combined average flow

71 publicly owned wastewater treatment plants in Iowa hold NPDES permits that expire during 2026, issued by Iowa Department of Natural Resources. 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:

2027 (106)2028 (102)All Iowa NPDES permits →
Publicly owned wastewater treatment plants in Iowa with NPDES permits expiring in 2026, from EPA ICIS-NPDES records. Refreshed on every release.
FacilityCityAvg flow (MGD)NPDES permitExpiresViolations (3y)
Cherokee WWTPCherokee—IA0059005Jan 202685
Oskaloosa SW STPOskaloosa0.71IA0038521Mar 20265
Oskaloosa NE WWTPOskaloosa0.69IA0038539Mar 202651
Albia City Of STP (north)Albia0.32IA0036871Apr 202659
Ida Grove WWTPIda Grove0.17IA0020761Apr 202620
Albia Sewer Treatment Plant C/o City HallAlbia0.07IA0036889Apr 202650
Kanawha City Of STPKanawha0.06IA0026000Apr 20268
Oelwein WWTPOelwein1.4IA0032344May 202616
Fairfield City Of STPFairfield0.93IA0035076May 202631
Sac City WWTPSac City0.24IA0033090May 202611
Davenport Wastewater Treatment PlantDavenport25.36IA0043052Jun 20260
Manchester WWTPManchester0.64IA0021032Jun 20261
Cresco WWTPCresco0.53IA0021334Jun 202611
Corydon City Of STPCorydon0.47IA0049573Jun 202646
Marengo City Of STPMarengo0.31IA0047937Jun 2026102
Clarence WWTPClarence0.3IA0027201Jun 20262
Rock Rapids City Of STPRock Rapids0.28IA0032786Jun 20262
Minden City Of STPMinden0.05IA0048330Jun 20267
Galva WWTPGalva0.04IA0056537Jun 202653
Mitchell County WW Pretreatment PlantOsage0.03MO0030821Jun 2026109
West Point City Of STPWest Point0.08IA0043109Jul 20261
Aurelia WWTPAurelia0.07IA0028908Jul 20261
Earling City Of STPEarling0.04IA0025364Jul 202620
Maple River Junction WWTPCarroll0.0071IA0081639Jul 202614
Iowa Great Lakes Sanitary District WWTPMilford2.5IA0059765Aug 202615
Laurens City Of STPLaurens0.18IA0025950Aug 202615
Elk Horn City Of STPElk Horn0.04IA0027677Aug 20267
Allerton City Of STP SouthAllerton0.03IA0054046Aug 202633
Allerton City Of STP NorthAllerton—IA0054054Aug 20266
Petersburg, City Of STP (eiruss)Dyersville—IA0079740Aug 20262
Tracy City Of STP (mahaska Rural Water Systems, Inc.)Tracy—IA0081647Aug 20260
Webster City WWTPWebster City1.36IA0036625Sep 202613
Belmond City Of STPBelmond0.34IA0041777Sep 202645
Dallas Center City Of STPDallas Center0.25IA0035319Sep 202624
Correctionville City Of STPCorrectionville0.11IA0023531Sep 20264
Goose Lake City Of STPGoose Lake—IA0056944Sep 202623
Martensdale City Of STPMartensdale—IA0031836Sep 20261
Martinsburg WWTPMartinsburg—IA0078727Sep 20260
Vail City Of STPVail—IA0032654Sep 20261
New London WWTPNew London0.26IA0025941Oct 20262
Granger WWTPGranger0.25IA0041912Oct 202670
Wyoming WWTPWyoming0.09IA0032646Oct 202620
Middletown WWTPMiddletown0.04IA0025381Oct 202615
Brandon WWTPBrandon0.03IA0028185Oct 202646
Archer City Of STPArcher0.0054IA0082422Oct 20260
Auburn City Of STPAuburn—IA0057029Oct 20261
Blockton City Of (southern Ia Rural Water Assn.)Blockton—IA0076023Oct 20260
Gravity, City Of-(southern Iowa Rural Water Association)Gravity—IA0075957Oct 20260
Stacyville, City Of STPStacyville—IA0035254Oct 20260
Westside City Of STPWestside—IA0040274Oct 20261
La Porte City WWTPLa Porte City0.27IA0035963Nov 202613
Fairbank WWTPFairbank0.15IA0035041Nov 20265
Hartford City Of STPHartford0.15IA0066761Nov 202649
Exira City Of STPExira—IA0027987Nov 20262
Lorimor City Of STPLorimor—IA0062910Nov 20260
Rickardsville WWTPDurango—IA0066311Nov 20260
Ute City Of STPUte—IA0043010Nov 20266
Vincent City Of STPVincent—IA0032930Nov 202613
Schleswig City Of STPSchleswig0.1IA0036170Dec 20260
Everly WWTPEverly0.08IA0028916Dec 20267
Carson City Of STPCarson0.07IA0042901Dec 202612
Saint Olaf City Of STPSaint Olaf0.0055IA0071072Dec 20268
Mount Sterling, City Of STPMount Sterling0.0013IA0076651Dec 20260
Lanesboro City Of STPLanesboro—IA0062162Dec 20262
Menlo WWTPMenlo—IA0071374Dec 20262
Minburn City Of STPMinburn—IA0023418Dec 20264
Oxford Junction WWTPOxford Junction—IA0032450Dec 20261
Templeton WWTPTempleton—IA0033782Dec 20264
Thor City Of STPThor—IA0058581Dec 20260
Webster WWTPWebster—IA0078719Dec 20261
West Chester City Of STPWest Chester—IA0072460Dec 20266

Iowa permit renewals in 2026: 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 · Ozonation · Activated sludge · 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 2026: Iowa wastewater plants.” Updated October 26, 2026. https://klarifi.io/facilities/iowa/permits-expiring/2026

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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