Clean Water Act discharge permit · NPDES IA0032808

WINTHROP CITY OF STP, Winthrop, IA: NPDES IA0032808 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
7Pollutants under a numeric limit
2Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

WINTHROP CITY OF STP, held by CITY OF WINTHROP, holds NPDES permit IA0032808. EPA’s file records it issued June 1, 2020 and expiring May 31, 2025. 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	WINTHROP CITY OF STP
Permittee as filed	CITY OF WINTHROP
NPDES ID	IA0032808
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Individual permit
Discharger class	Minor discharger
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	June 1, 2020
Expiration date	May 31, 2025
Issuing agency	STA
Address	Winthrop, IA 50682
Subwatershed	Smith Creek-Wapsipinicon River (HUC 070801020805)
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

7Pollutants on file
7Under a numeric limit
5With a violation of any kind
2With 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
Oxygen, dissolved [DO]	1	16	12	June 30, 2026	60% over the limit
Nitrogen, ammonia total [as N]	48	4	4	March 31, 2020	228% over the limit
BOD, carbonaceous [5 day, 20 C]	4	10	0
Solids, total suspended	9	8	0
pH	5	4	0
BOD, 5-day, 20 deg. C	5	0	0
E. coli	1	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 IA0032808.

Inspections

EPA’s inspection file holds no inspection for NPDES IA0032808.

Formal enforcement and penalties

0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.

Informal enforcement

EPA’s informal enforcement file holds no action for NPDES IA0032808.

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

Watch this permit

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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 IA0032808 there.

Nearby on the register

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

This public-records page covers Clean Water Act NPDES permit IA0032808 for WINTHROP CITY OF STP in Winthrop, IA, held by CITY OF WINTHROP, which is administratively continued and classed as a Minor discharger. The page lists 7 pollutants under a numeric limit and 2 pollutants with an effluent exceedance, with the permit's issue and expiration dates as EPA's file recorded them as of October 14, 2026.