How many wastewater permits expire in Iowa in 2027?

106 NPDES permits held by publicly owned wastewater treatment plants in Iowa expire in 2027, covering a combined average flow of 25 MGD. The busiest month is Mar 2027 with 14 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 Iowa in 2027?

Burlington, City Of (wwtp) in Burlington, treating about 5.79 MGD under permit IA0043079, expiring Jan 2027.

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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Iowa wastewater permits expiring in 2027

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

106 NPDES permits · 25 MGD combined average flow

106 publicly owned wastewater treatment plants in Iowa hold NPDES permits that expire during 2027, 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:

2026 (71)2028 (102)All Iowa NPDES permits →

Publicly owned wastewater treatment plants in Iowa with NPDES permits expiring in 2027, from EPA ICIS-NPDES records. Refreshed on every release.
Facility	City	Avg flow (MGD)	NPDES permit	Expires	Violations (3y)
Burlington, City Of (wwtp)	Burlington	5.79	IA0043079	Jan 2027	4
City Of Shenandoah STP	Shenandoah	1.1	IA0032328	Jan 2027	74
Bedford City Of STP	Bedford	0.17	IA0026018	Jan 2027	2
Shell Rock WWTP	Shell Rock	0.16	IA0033359	Jan 2027	48
Bayard WWTP	Bayard	0.1	IA0061468	Jan 2027	123
Conrad WWTP	Conrad	0.07	IA0034355	Jan 2027	6
Whiting City Of STP	Whiting	0.05	IA0032719	Jan 2027	0
Festina-Winneshiek County-STP	Decorah	0.0067	IA0075442	Jan 2027	0
Kellerton City Of STP	Kellerton	—	IA0061760	Jan 2027	1
Riverton WWTP	Riverton	—	IA0077097	Jan 2027	0
Huxley City Of STP	Huxley	0.61	IA0083518	Feb 2027	2
Hampton WWTP	Hampton	0.38	IA0036471	Feb 2027	16
Central City City Of STP	Central City	0.12	IA0027979	Feb 2027	6
Dakota City City Of STP	Dakota City	0.1	IA0048003	Feb 2027	0
Massena WWTP	Massena	0.07	IA0048348	Feb 2027	25
Marquette WWTP	Marquette	0.03	IA0059463	Feb 2027	1
Cleghorn WWTP	Cleghorn	—	IA0042846	Feb 2027	0
Lawler City Of STP	Lawler	—	IA0056910	Feb 2027	0
Olin WWTP	Olin	—	IA0036064	Feb 2027	9
Rose Hill City Of STP	Rose Hill	—	IA0072311	Feb 2027	12
Schaller City Of STP	Schaller	—	IA0042935	Feb 2027	13
City Of Pella	Pella	2.36	IA0043869	Mar 2027	0
Clarinda City Of STP	Clarinda	0.65	IA0035190	Mar 2027	17
Durant City Of STP	Durant	0.14	IA0064891	Mar 2027	0
Elkader WWTP	Elkader	0.1	IA0021962	Mar 2027	0
Griswold WWTP	Griswold	0.09	IA0031411	Mar 2027	4
Paullina WWTF	Paullina	0.08	IA0032352	Mar 2027	2
Princeton City Of STP	Princeton	0.07	IA0033227	Mar 2027	24
Fonda City Of STP	Fonda	0.06	IA0046671	Mar 2027	0
Elgin WWTP	Elgin	0.04	IA0024414	Mar 2027	0
Delhi City Of STP	Delhi	—	IA0047848	Mar 2027	6
Eddyville, City Of STP	Eddyville	—	IA0020770	Mar 2027	14
Luana City Of STP	Luana	—	IA0027685	Mar 2027	0
Sutherland Stl	Sutherland	—	IA0036129	Mar 2027	15
Thayer City Of STP	Thayer	—	IA0079936	Mar 2027	0
Kalona City Of STP	Kalona	0.31	IA0059196	Apr 2027	57
Denver WWTP	Denver	0.28	IA0044156	Apr 2027	0
Bloomfield WWTP (main)	Bloomfield	0.24	IA0047929	Apr 2027	8
Baxter WWTP	Baxter	0.21	IA0023353	Apr 2027	15
Runnells City Of STP	Runnells	0.05	IA0063355	Apr 2027	80
New Vienna WWTP	New Vienna	0.02	IA0027391	Apr 2027	58
Ainsworth City Of STP	Ainsworth	—	IA0069183	Apr 2027	13
Dayton City Of STP	Dayton	—	IA0023558	Apr 2027	4
Grand Junction WWTP	Grand Junction	—	IA0041891	Apr 2027	0
Kirkville, City Of	Ottumwa	—	IA0074667	Apr 2027	4
Prescott City Of STP	Prescott	—	IA0033456	Apr 2027	6
City Of Solen Treatment Plant	Solon	0.49	IA0036978	May 2027	18
Lamoni WWTP	Lamoni	0.42	IA0036102	May 2027	6
Lake Mills City Of STP	Lake Mills	0.28	IA0027448	May 2027	71
Glidden WWTP	Glidden	0.15	IA0024571	May 2027	17
Armstrong City Of STP	Armstrong	0.1	IA0028517	May 2027	113
Redfield WWTP	Redfield	0.07	IA0036099	May 2027	7
Irwin City Of STP	Irwin	—	IA0021024	May 2027	0
Macedonia City Of STP	Macedonia	—	IA0042919	May 2027	0
Silver City, City Of STP	Silver City	—	IA0079774	May 2027	0
Anita City Of STP	Anita	0.13	IA0024520	Jun 2027	1
Afton City Of STP	Afton	0.1	IA0041831	Jun 2027	0
East Peru City Of STP (warren Water District)	Peru	—	IA0079791	Jun 2027	1
Nichols City Of STP	Nichols	—	IA0036561	Jun 2027	1
Corning City Of STP	Corning	0.47	IA0027375	Jul 2027	13
Guthrie Ctr City Of STP	Guthrie Center	0.12	IA0041866	Jul 2027	2
Walker City Of STP	Walker	0.11	IA0059081	Jul 2027	3
Wayland, City Of STP	Wayland	0.1	IA0047953	Jul 2027	54
Harpers Ferry, City Of STP	Harpers Ferry	0.02	IA0070564	Jul 2027	0
Bonaparte City Of STP	Bonaparte	—	IA0050628	Jul 2027	3
Keswick, City Of STP	Keswick	—	IA0079910	Jul 2027	5
Oto City Of STP	Oto	—	IA0065811	Jul 2027	6
Patterson City Of STP	Patterson	—	IA0062961	Jul 2027	0
Richland WWTP	Richland	—	IA0061328	Jul 2027	0
Indianola Water Resource Recovery Facility	Indianola	1.96	IA0053405	Aug 2027	5
Carroll WWTP	Carroll	1.04	IA0021377	Aug 2027	1
Pleasantville Water Works	Pleasantville	0.26	IA0035921	Aug 2027	9
Worthington WWTP	Worthington	0.09	IA0058548	Aug 2027	21
Van Meter City Of STP	Van Meter	0.08	IA0036021	Aug 2027	10
Hinton City Of STP	Hinton	0.04	IA0057053	Aug 2027	7
Coin City Of STP	Coin	—	IA0062332	Aug 2027	0
Farmington City Of STP	Farmington	—	IA0060313	Aug 2027	16
Paton WWTP	Paton	—	IA0060321	Aug 2027	0
Rembrandt WWTP	Rembrandt	—	IA0033219	Aug 2027	0
Rockford WWTP	Rockford	0.29	IA0058432	Sep 2027	1
Nashua WWTP	Nashua	0.22	IA0024503	Sep 2027	13
Melcher-Dallas WWTP	Melcher-Dallas	0.2	IA0047783	Sep 2027	2
Essex City Of STP	Essex	0.11	IA0026603	Sep 2027	45
Homestead Sanitary District	Homestead	0.05	IA0023591	Sep 2027	3
Sidney WWTP	Sidney	0.04	IA0035971	Sep 2027	0
Anthon City Of STP	Anthon	—	IA0042854	Sep 2027	0
Conesville City Of STP	Conesville	—	IA0058769	Sep 2027	6
Lost Nation City Of STP	Lost Nation	—	IA0036544	Sep 2027	0
Rowley City Of STP	Rowley	—	IA0043672	Sep 2027	5
Decorah City Of STP	Decorah	0.92	IA0035220	Oct 2027	3
Rockwell WWTP	Rockwell	0.17	IA0033481	Oct 2027	0
George City Of STP	George	0.08	IA0036081	Oct 2027	21
Marshalltown City Of STP	Marshalltown	—	IA0038610	Oct 2027	7
Sherrill East WWTP	Sherrill	—	IA0056952	Oct 2027	0
Adel WWTP	Adel	0.77	IA0041921	Nov 2027	3
West Branch City Of STP	West Branch	0.49	IA0032859	Nov 2027	19
Dysart City Of STP	Dysart	0.28	IA0020745	Nov 2027	10
Ellsworth WWTP	Ellsworth	0.14	IA0026280	Nov 2027	0
Gilman City Of STP	Gilman	0.02	IA0029033	Nov 2027	4
Doon City Of STP	Doon	—	IA0023736	Nov 2027	36
Dundee City Of STP	Dundee	—	IA0062839	Nov 2027	4
Graettinger City Of STP	Graettinger	—	IA0027821	Nov 2027	2
Monticello WWTP	Monticello	0.5	IA0026034	Dec 2027	7
Rockwell City WWTP	Rockwell City	0.32	IA0033138	Dec 2027	44
Sumner City Of STP	Sumner	0.29	IA0033766	Dec 2027	1
Humeston City Of STP	Humeston	0.13	IA0043150	Dec 2027	28

Iowa 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 October 26, 2026.

Wastewater terms: NPDES permit · POTW · Biological nutrient removal · Tertiary treatment · Activated sludge · Oxidation ditch · 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 2027: Iowa wastewater plants.” Updated October 26, 2026. https://klarifi.io/facilities/iowa/permits-expiring/2027

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