How many wastewater permits expire in Iowa in 2028?

93 NPDES permits held by publicly owned wastewater treatment plants in Iowa expire in 2028, covering a combined average flow of 1 MGD. The busiest month is Mar 2028 with 15 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 2028?

Clarion, City Of STP in Clarion, treating about 0.82 MGD under permit IA0030945, expiring Jan 2028.

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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Iowa wastewater permits expiring in 2028

Name: Iowa NPDES permits expiring in 2028
Creator: Klarifi
License: https://klarifi.io/terms-of-service

93 NPDES permits · 1 MGD combined average flow

93 publicly owned wastewater treatment plants in Iowa hold NPDES permits that expire during 2028, 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)2027 (95)All Iowa NPDES permits →

Publicly owned wastewater treatment plants in Iowa with NPDES permits expiring in 2028, from EPA ICIS-NPDES records. Refreshed on every release.
Facility	City	Avg flow (MGD)	NPDES permit	Expires	Technology	Violations (3y)
Clarion, City Of STP	Clarion	0.82	IA0030945	Jan 2028	Aerated lagoons	13
Badger City Of STP	Badger	—	IA0029041	Jan 2028	Uncovered lagoons	6
Davenport, City Of-West Locust Lagoon	Davenport	—	IA0076261	Jan 2028	Uncovered lagoons	2
Delmar, City Of STP	Delmar	—	IA0061913	Jan 2028	Uncovered lagoons	14
New Liberty, City Of-STP	New Liberty	—	IA0075221	Jan 2028	Uncovered lagoons	8
Promise City, City Of STP	Promise City	—	IA0082007	Jan 2028	Uncovered lagoons	7
Algona City Of STP	Algona	—	IA0022055	Feb 2028	Clarifiers, Biogas silos, Biogas balloons	13
Coggon WWTP	Coggon	—	IA0024473	Feb 2028	Uncovered lagoons	20
Ely City Of STP	Ely	—	IA0047988	Feb 2028	Uncovered lagoons	7
Goodell City Of STP	Goodell	—	IA0082562	Feb 2028	Uncovered lagoons	8
Harvey City Of STP	Harvey	—	IA0072338	Feb 2028	Uncovered lagoons	52
Rippey WWTP	Rippey	—	IA0041882	Feb 2028	Uncovered lagoons	6
Stratford WWTP	Stratford	—	IA0035980	Feb 2028	Uncovered lagoons	2
Aurora City Of STP	Aurora	—	IA0059412	Mar 2028	Aerated lagoons, Uncovered lagoons	9
Cambridge City Of STP	Cambridge	—	IA0022101	Mar 2028	Aerated lagoons, Uncovered lagoons	16
City Of Rinard WTP	Rinard	—	IA0033715	Mar 2028	Biogas silos	58
Donahue City Of STP	Donahue	—	IA0029017	Mar 2028	Uncovered lagoons	28
Grafton City Of STP	Grafton	—	IA0062529	Mar 2028	Uncovered lagoons	0
Kimballton City Of STP	Kimballton	—	IA0025372	Mar 2028	Uncovered lagoons	27
Lake Park WWTP	Lake Park	—	IA0036919	Mar 2028	Uncovered lagoons	14
Liscomb City Of STP	Liscomb	—	IA0056847	Mar 2028	Uncovered lagoons	0
Logan WWTP	Logan	—	IA0058599	Mar 2028	Uncovered lagoons	0
Lucas City Of STP (rathbun Regional Water Association)	Lucas	—	IA0072621	Mar 2028	Uncovered lagoons	2
Mechanicsville WWTP	Mechanicsville	—	IA0022314	Mar 2028	Aerated lagoons, Uncovered lagoons	12
Terril WWTP	Terril	—	IA0036609	Mar 2028	Uncovered lagoons	1
Unionville City Of STP	Unionville	—	IA0074373	Mar 2028	Uncovered lagoons	4
Villisca City Of STP	Villisca	—	IA0032549	Mar 2028	Covered lagoons	11
Wellsburg WWTP	Wellsburg	—	IA0042803	Mar 2028	Aerated lagoons, Uncovered lagoons	3
City Of Wapello Wastewater Treatment Plant	Wapello	—	IA0047961	Apr 2028	Aerated lagoons, Uncovered lagoons	10
Grand River WWTP	Grand River	—	IA0066346	Apr 2028	Uncovered lagoons	56
Lidderdale WWTP	Lidderdale	—	IA0056855	Apr 2028	Uncovered lagoons	2
Martelle City Of STP	Martelle	—	IA0062987	Apr 2028	Uncovered lagoons	6
New Albin City Of STP	New Albin	—	IA0026611	Apr 2028	Uncovered lagoons	7
Peterson City Of STP	Peterson	—	IA0033677	Apr 2028	Uncovered lagoons	1
Sac And Fox Settlement Lagoon	Tama	—	IA0073750	Apr 2028	Uncovered lagoons	137
Toledo Wastewater Treatment Facility	Toledo	—	IA0033103	Apr 2028	Uncovered lagoons	2
Van Horne WWTP	Van Horne	—	IA0033341	Apr 2028	Clarifiers, Uncovered lagoons	3
Garrison WWTP	Garrison	—	IA0056804	May 2028	Uncovered lagoons	2
Hazelton WWTP	Hazleton	—	IA0044024	May 2028	Uncovered lagoons	5
Leland City Of STP	Leland	—	IA0036528	May 2028	Uncovered lagoons	6
Lone Tree South WWTP	Lone Tree	—	IA0060330	May 2028	Uncovered lagoons	4
Newhall WWTP	Newhall	—	IA0043664	May 2028	Uncovered lagoons	7
Ruthven City Of STP	Ruthven	—	IA0032441	May 2028	Aerated lagoons, Uncovered lagoons	7
Calamus City Of STP	Calamus	—	IA0028622	Jun 2028	Uncovered lagoons	2
Corwith City Of STP	Corwith	—	IA0021351	Jun 2028	Aerated lagoons, Uncovered lagoons	42
Danbury City Of STP	Danbury	—	IA0035246	Jun 2028	Uncovered lagoons	6
Defiance City Of STP	Defiance	—	IA0042862	Jun 2028	Uncovered lagoons	5
Dow City, City Of STP	Dow City	—	IA0034371	Jun 2028	Uncovered lagoons	3
Dunkerton City Of STP	Dunkerton	—	IA0042790	Jun 2028	Uncovered lagoons	17
Morning Sun City Of STP	Morning Sun	—	IA0059587	Jun 2028	Uncovered lagoons	62
Oyens City Of STP	Oyens	—	IA0032336	Jun 2028	Uncovered lagoons	4
Park View Water Co	Eldridge	—	IA0062561	Jun 2028	Aerated lagoons	1
St Lucas WWTP	St Lucas	—	IA0074705	Jun 2028	Aerated lagoons, Uncovered lagoons	1
Woden City Of STP	Woden	—	IA0084174	Jun 2028	Uncovered lagoons	0
Breda WWTP	Breda	—	IA0056103	Jul 2028	Uncovered lagoons	11
Callender City Of STP	Callender	—	IA0057096	Jul 2028	Uncovered lagoons	9
Dumont City Of STP	Dumont	—	IA0033316	Jul 2028	Aerated lagoons	74
Hudson WWTP	Hudson	—	IA0027243	Jul 2028	Aerated lagoons	6
Jewell City Of STP	Jewell	—	IA0024422	Jul 2028	Uncovered lagoons	7
Pomeroy City Of STP	Pomeroy	—	IA0032824	Jul 2028	Uncovered lagoons	4
Akron City Of STP	Akron	—	IA0035211	Aug 2028	Uncovered lagoons	4
Brooklyn City Of STP	Brooklyn	—	IA0020958	Aug 2028	Uncovered lagoons	0
Gladbrook City Of STP	Gladbrook	—	IA0025330	Aug 2028	Aerated lagoons, Uncovered lagoons	32
Harris City Of STP	Harris	—	IA0036048	Aug 2028	Uncovered lagoons	0
Lamont WWTF	Lamont	—	IA0025348	Aug 2028	Uncovered lagoons	7
Liberty Center City Of (warren Co. Board Of Supervisors)	Liberty Center	—	IA0080152	Aug 2028	Aerated lagoons, Uncovered lagoons	0
Linden City Of STP	Linden	—	IA0081973	Aug 2028	Uncovered lagoons	0
Plainfield City Of STP	Plainfield	—	IA0033693	Aug 2028	Uncovered lagoons	0
Waukon City Of STP	Waukon	—	IA0033081	Aug 2028	Uncovered lagoons, Cooling towers	9
Winfield WWTP	Winfield	—	IA0033367	Aug 2028	Aerated lagoons, Uncovered lagoons	70
Bellevue City Of STP	Bellevue	—	IA0029009	Sep 2028	Uncovered lagoons	0
Ireton City Of STP	Ireton	—	IA0027961	Sep 2028	Uncovered lagoons	4
Lake City WWTP	Lake City	—	IA0020842	Sep 2028	Uncovered lagoons	11
Lewis WWTP	Lewis	—	IA0057487	Sep 2028	Aerated lagoons	0
Lovilia City Of STP	Lovilia	—	IA0027430	Sep 2028	Aerated lagoons, Uncovered lagoons	21
Moorhead City Of STP	Moorhead	—	IA0062995	Sep 2028	Uncovered lagoons	4
Evansdale City Of STP	Evansdale	—	IA0034231	Oct 2028	Clarifiers, Uncovered lagoons	15
Livermore WWTP	Livermore	—	IA0023566	Oct 2028	Uncovered lagoons	1
Swea City City Of STP	Swea City	—	IA0047813	Oct 2028	Uncovered lagoons	3
Victor City Of STP	Victor	—	IA0058190	Oct 2028	Uncovered lagoons	20
West Union City Of STP	West Union	—	IA0035378	Oct 2028	Uncovered lagoons, Biogas silos	0
Miles WWTP	Miles	—	IA0028606	Nov 2028	Uncovered lagoons	9
Monona WWTP	Monona	—	IA0036927	Nov 2028	Uncovered lagoons	10
Montpelier Sanitary District, Village Of	Montpelier	—	IA0073890	Nov 2028	Aerated lagoons	2
Pisgah City Of STP	Pisgah	—	IA0057827	Nov 2028	Uncovered lagoons	0
Renwick Stl	Renwick	—	IA0032760	Nov 2028	Uncovered lagoons	3
Wadena WWTP	Wadena	—	IA0032492	Nov 2028	Uncovered lagoons	0
City Of Spragueville STP	Spragueville	—	IA0050741	Dec 2028	Uncovered lagoons	7
Fontanelle City Of STP	Fontanelle	—	IA0041840	Dec 2028	Aerated lagoons	5
Lake Cornelia Sanitary District	Clarion	—	IA0066401	Dec 2028	Uncovered lagoons	2
Manning WWTP	Manning	—	IA0023337	Dec 2028	Uncovered lagoons	16
Rock Falls WWTP	Rock Falls	—	IA0063495	Dec 2028	Uncovered lagoons	0
Thornton City Of STP	Thornton	—	IA0033201	Dec 2028	Uncovered lagoons	12

Iowa 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.

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