Clean Water Act discharge permit · NPDES IA0035866

KNOXVILLE CITY OF STP, Knoxville, IA: NPDES IA0035866 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
0Pollutants under a numeric limit
7Pollutants with an effluent exceedance

KNOXVILLE CITY OF STP, held by CITY OF KNOXVILLE, holds NPDES permit IA0035866. EPA’s file records it issued July 1, 2015 and expiring June 30, 2020. 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	KNOXVILLE CITY OF STP
Permittee as filed	CITY OF KNOXVILLE
NPDES ID	IA0035866
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	July 1, 2015
Expiration date	June 30, 2020
Issuing agency	STA
Address	Knoxville, IA 50138
Subwatershed	White Breast Creek (HUC 071000081405)
Program components on file	Biosolids, POTW
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
0Under a numeric limit
7With a violation of any kind
7With 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	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
E. coli	10	10	October 31, 2024	15,530% over the limit
Solids, total suspended	11	3	January 31, 2023	122% over the limit
BOD, carbonaceous [5 day, 20 C]	11	3	January 31, 2023	63% over the limit
Nitrogen, ammonia total [as N]	3	3	July 31, 2024	133% over the limit
Copper, total [as Cu]	3	3	June 30, 2026	24,730% over the limit
pH	6	2	February 28, 2021
Oxygen, dissolved [DO]	5	1	August 31, 2015	95% over the limit

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 IA0035866.

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 IA0035866 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 IA0035866 for KNOXVILLE CITY OF STP in Knoxville, IA, held by CITY OF KNOXVILLE, with a permit status of administratively continued and a Major Discharger class. The facts list 7 pollutants under a numeric limit and 0 pollutants with an effluent exceedance, as of October 14, 2026.