Clean Water Act discharge permit · NPDES IA0035947

CLINTON CITY OF STP, Clinton, IA: NPDES IA0035947 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
10Pollutants under a numeric limit
6Pollutants with an effluent exceedance

CLINTON CITY OF STP, held by CITY OF CLINTON, holds NPDES permit IA0035947. EPA’s file records it issued March 1, 2018 and expiring February 28, 2023. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filed	CLINTON CITY OF STP
Permittee as filed	CITY OF CLINTON
NPDES ID	IA0035947
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Individual permit
Discharger class	Major discharger
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	March 1, 2018
Expiration date	February 28, 2023
Issuing agency	STA
Address	Clinton, IA 52732
Receiving water impaired	303(D) Listed
Subwatershed	Mill Creek (HUC 070801010202)
Program components on file	Biosolids, POTW, Pretreatment
NAICS	221320 – Sewage Treatment Facilities
SIC	4952 – Sewerage Systems

Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.

Effluent limits and exceedances

11Pollutants on file
10Under a numeric limit
7With a violation of any kind
6With an effluent exceedance

An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.

Pollutant or measure	Limits	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
Solids, total suspended	9	170	158	August 31, 2022	2,549% over the limit
Nitrogen, ammonia total [as N]	48	107	99	December 31, 2011	328% over the limit
BOD, carbonaceous [5 day, 20 C]	4	81	69	February 29, 2012	5,400% over the limit
Copper, total [as Cu]	0	6	6	November 30, 2010	154% over the limit
pH	5	11	5	September 30, 2025
Toxicity [acute], Ceriodaphnia dubia	1	7	2	June 30, 2024	100% over the limit
Toxicity [acute], Pimephales promelas [Fathead Minnow]	1	5	0
Nitrogen, total [as N]	10	0	0
Phosphorus, total [as P]	10	0	0
BOD, 5-day, 20 deg. C	5	0	0
Nitrogen, Kjeldahl, total [as N]	5	0	0

Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES IA0035947.

Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.

Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.

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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID IA0035947 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

This public-records page covers NPDES discharge permit IA0035947 for CLINTON CITY OF STP in Clinton, IA, held by CITY OF CLINTON, with a permit status of administratively continued and a Major Discharger class. The page lists 10 pollutants under a numeric limit and 6 pollutants with an effluent exceedance, with the permit's issue date of March 1, 2018 and expiration date of February 28, 2023 as of October 14, 2026.