How many wastewater permits expire in Iowa in 2028?

102 NPDES permits held by publicly owned wastewater treatment plants in Iowa expire in 2028, covering a combined average flow of 10 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?

Algona City Of STP in Algona, treating about 0.72 MGD under permit IA0022055, expiring Feb 2028.

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 2028

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

102 NPDES permits · 10 MGD combined average flow

102 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 (106)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	Violations (3y)
Badger City Of STP	Badger	—	IA0029041	Jan 2028	6
Clarion, City Of STP	Clarion	—	IA0030945	Jan 2028	13
Davenport, City Of-West Locust Lagoon	Davenport	—	IA0076261	Jan 2028	2
Delmar, City Of STP	Delmar	—	IA0061913	Jan 2028	14
New Liberty, City Of-STP	New Liberty	—	IA0075221	Jan 2028	8
Promise City, City Of STP	Promise City	—	IA0082007	Jan 2028	7
Algona City Of STP	Algona	0.72	IA0022055	Feb 2028	13
Ely City Of STP	Ely	0.17	IA0047988	Feb 2028	7
Stratford WWTP	Stratford	0.16	IA0035980	Feb 2028	2
Coggon WWTP	Coggon	0.13	IA0024473	Feb 2028	22
Goodell City Of STP	Goodell	—	IA0082562	Feb 2028	8
Harvey City Of STP	Harvey	—	IA0072338	Feb 2028	43
Rippey WWTP	Rippey	—	IA0041882	Feb 2028	6
Villisca City Of STP	Villisca	0.18	IA0032549	Mar 2028	11
Mechanicsville WWTP	Mechanicsville	0.13	IA0022314	Mar 2028	12
Lake Park WWTP	Lake Park	0.12	IA0036919	Mar 2028	14
Logan WWTP	Logan	0.08	IA0058599	Mar 2028	0
Wellsburg WWTP	Wellsburg	0.08	IA0042803	Mar 2028	3
Kimballton City Of STP	Kimballton	0.04	IA0025372	Mar 2028	26
City Of Rinard WTP	Rinard	0.0018	IA0033715	Mar 2028	58
Aurora City Of STP	Aurora	—	IA0059412	Mar 2028	9
Cambridge City Of STP	Cambridge	—	IA0022101	Mar 2028	16
Donahue City Of STP	Donahue	—	IA0029017	Mar 2028	28
Grafton City Of STP	Grafton	—	IA0062529	Mar 2028	0
Liscomb City Of STP	Liscomb	—	IA0056847	Mar 2028	0
Lucas City Of STP (rathbun Regional Water Association)	Lucas	—	IA0072621	Mar 2028	2
Terril WWTP	Terril	—	IA0036609	Mar 2028	1
Unionville City Of STP	Unionville	—	IA0074373	Mar 2028	4
Toledo Wastewater Treatment Facility	Toledo	0.43	IA0033103	Apr 2028	2
City Of Wapello Wastewater Treatment Plant	Wapello	0.25	IA0047961	Apr 2028	11
Sac And Fox Settlement Lagoon	Tama	0.21	IA0073750	Apr 2028	80
Cascade Municipal Utilities WWTP	Cascade	0.19	IA0027740	Apr 2028	1
Van Horne WWTP	Van Horne	0.09	IA0033341	Apr 2028	3
New Albin City Of STP	New Albin	0.03	IA0026611	Apr 2028	4
Grand River WWTP	Grand River	—	IA0066346	Apr 2028	56
Lidderdale WWTP	Lidderdale	—	IA0056855	Apr 2028	2
Martelle City Of STP	Martelle	—	IA0062987	Apr 2028	6
Peterson City Of STP	Peterson	—	IA0033677	Apr 2028	1
Tipton WWTP (west)	Tipton	0.39	IA0032727	May 2028	6
Lone Tree South WWTP	Lone Tree	0.3	IA0060330	May 2028	4
Newhall WWTP	Newhall	0.28	IA0043664	May 2028	7
Hazelton WWTP	Hazleton	0.13	IA0044024	May 2028	5
Ruthven City Of STP	Ruthven	0.1	IA0032441	May 2028	7
Garrison WWTP	Garrison	—	IA0056804	May 2028	2
Leland City Of STP	Leland	—	IA0036528	May 2028	6
Park View Water Co	Eldridge	0.21	IA0062561	Jun 2028	1
Corwith City Of STP	Corwith	0.2	IA0021351	Jun 2028	42
Dunkerton City Of STP	Dunkerton	0.16	IA0042790	Jun 2028	17
Morning Sun City Of STP	Morning Sun	0.12	IA0059587	Jun 2028	63
Calamus City Of STP	Calamus	—	IA0028622	Jun 2028	2
Danbury City Of STP	Danbury	—	IA0035246	Jun 2028	7
Defiance City Of STP	Defiance	—	IA0042862	Jun 2028	5
Dow City, City Of STP	Dow City	—	IA0034371	Jun 2028	3
Oyens City Of STP	Oyens	—	IA0032336	Jun 2028	4
St Lucas WWTP	St Lucas	—	IA0074705	Jun 2028	1
Woden City Of STP	Woden	—	IA0084174	Jun 2028	0
Mitchellville Water Supply	Mitchellville	0.4	IA0021997	Jul 2028	70
Hudson WWTP	Hudson	0.35	IA0027243	Jul 2028	8
Dumont City Of STP	Dumont	0.26	IA0033316	Jul 2028	75
Jewell City Of STP	Jewell	0.11	IA0024422	Jul 2028	7
Breda WWTP	Breda	—	IA0056103	Jul 2028	11
Callender City Of STP	Callender	—	IA0057096	Jul 2028	9
Pomeroy City Of STP	Pomeroy	—	IA0032824	Jul 2028	4
Waukon City Of STP	Waukon	0.71	IA0033081	Aug 2028	9
Winfield WWTP	Winfield	0.24	IA0033367	Aug 2028	65
Brooklyn City Of STP	Brooklyn	0.2	IA0020958	Aug 2028	0
Gladbrook City Of STP	Gladbrook	0.13	IA0025330	Aug 2028	33
Akron City Of STP	Akron	0.09	IA0035211	Aug 2028	4
Harris City Of STP	Harris	—	IA0036048	Aug 2028	0
Lamont WWTF	Lamont	—	IA0025348	Aug 2028	7
Liberty Center City Of (warren Co. Board Of Supervisors)	Liberty Center	—	IA0080152	Aug 2028	0
Linden City Of STP	Linden	—	IA0081973	Aug 2028	0
Plainfield City Of STP	Plainfield	—	IA0033693	Aug 2028	0
Lake City WWTP	Lake City	0.27	IA0020842	Sep 2028	11
Bellevue City Of STP	Bellevue	0.16	IA0029009	Sep 2028	0
Lovilia City Of STP	Lovilia	0.1	IA0027430	Sep 2028	20
Ireton City Of STP	Ireton	—	IA0027961	Sep 2028	4
Lewis WWTP	Lewis	—	IA0057487	Sep 2028	0
Moorhead City Of STP	Moorhead	—	IA0062995	Sep 2028	4
Leclaire City Of STP	Le Claire	0.37	IA0022012	Oct 2028	17
West Union City Of STP	West Union	0.37	IA0035378	Oct 2028	0
Victor City Of STP	Victor	0.15	IA0058190	Oct 2028	19
Ricketts City Of STP	Ricketts	0.0015	IA0042927	Oct 2028	5
Evansdale City Of STP	Evansdale	—	IA0034231	Oct 2028	14
Livermore WWTP	Livermore	—	IA0023566	Oct 2028	1
Swea City City Of STP	Swea City	—	IA0047813	Oct 2028	3
Center Point, City Of STP (south)	Center Point	0.3	IA0074420	Nov 2028	8
Monona WWTP	Monona	0.16	IA0036927	Nov 2028	10
Preston WWTP	Preston	0.08	IA0047864	Nov 2028	1
Klemme City Of STP	Klemme	0.07	IA0038466	Nov 2028	13
Renwick Stl	Renwick	0.04	IA0032760	Nov 2028	3
Montpelier Sanitary District, Village Of	Montpelier	0.02	IA0073890	Nov 2028	2
Miles WWTP	Miles	—	IA0028606	Nov 2028	9
Pisgah City Of STP	Pisgah	—	IA0057827	Nov 2028	0
Wadena WWTP	Wadena	—	IA0032492	Nov 2028	0
Audubon City Of STP	Audubon	0.22	IA0035203	Dec 2028	4
Manning WWTP	Manning	0.12	IA0023337	Dec 2028	17
Fontanelle City Of STP	Fontanelle	0.11	IA0041840	Dec 2028	10
City Of Spragueville STP	Spragueville	0.0035	IA0050741	Dec 2028	7
Lake Cornelia Sanitary District	Clarion	—	IA0066401	Dec 2028	2
Rock Falls WWTP	Rock Falls	—	IA0063495	Dec 2028	0
Thornton City Of STP	Thornton	—	IA0033201	Dec 2028	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 October 26, 2026.

Wastewater terms: NPDES permit · POTW · Biological nutrient removal · Tertiary treatment · Oxidation ditch · Anaerobic digester · 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 2028: Iowa wastewater plants.” Updated October 26, 2026. https://klarifi.io/facilities/iowa/permits-expiring/2028

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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