Clean Water Act discharge permit · NPDES IA0038539

OSKALOOSA CITY OF STP (NORTHEAST), Oskaloosa, IA: NPDES IA0038539 discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MajorDischarger class
12Pollutants under a numeric limit
5Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

OSKALOOSA CITY OF STP (NORTHEAST), held by CITY OF OSKALOOSA, holds NPDES permit IA0038539. EPA’s file records it issued April 1, 2021 and expiring March 31, 2026. 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	OSKALOOSA CITY OF STP (NORTHEAST)
Permittee as filed	CITY OF OSKALOOSA
NPDES ID	IA0038539
Permit status	Effective
Permit type	Individual permit
Discharger class	Major discharger
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	April 1, 2021
Expiration date	March 31, 2026
Issuing agency	STA
Address	Oskaloosa, IA 52577
Subwatershed	Spring Creek-South Skunk River (HUC 070801051203)
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

12Pollutants on file
12Under a numeric limit
6With a violation of any kind
5With 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
Copper, total [as Cu]	4	37	29	July 31, 2026	183,915% over the limit
Nitrogen, ammonia total [as N]	48	15	15	July 31, 2026	220% over the limit
Oxygen, dissolved [DO]	1	13	9	July 31, 2026	53% over the limit
Solids, total suspended	9	14	6	July 31, 2026	280% over the limit
BOD, carbonaceous [5 day, 20 C]	4	10	2	June 30, 2017	157% over the limit
pH	5	4	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
Toxicity [acute], Ceriodaphnia dubia	1	0	0
Toxicity [acute], Pimephales promelas [Fathead Minnow]	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 IA0038539.

Inspections

EPA’s inspection file holds no inspection for NPDES IA0038539.

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 IA0038539.

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 IA0038539 there.

Nearby on the register

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

This public-records page covers NPDES permit IA0038539 for the Oskaloosa City of STP (Northeast) in Oskaloosa, IA, held by the City of Oskaloosa, which is listed as an effective, major discharger individual permit. The facts list 12 pollutants on file, 5 pollutants under a numeric limit, and 5 pollutants with an effluent exceedance, within the Spring Creek-South Skunk River (HUC 070801051203) subwatershed.