Clean Water Act discharge permit · NPDES IA0021059

SPENCER, CITY OF STP, Spencer, IA: NPDES IA0021059 discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MajorDischarger class
0Pollutants under a numeric limit
6Pollutants with an effluent exceedance

SPENCER, CITY OF STP, held by City of Spencer, holds NPDES permit IA0021059. EPA’s file records it issued March 1, 2019 and expiring February 29, 2024. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filed	SPENCER, CITY OF STP
Permittee as filed	City of Spencer
NPDES ID	IA0021059
Permit status	Effective
Permit type	Individual permit
Discharger class	Major discharger
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	March 1, 2019
Expiration date	February 29, 2024
Issuing agency	STA
Address	Spencer, IA 51301
Receiving water impaired	303(D) Listed
Subwatershed	City of Spencer-Little Sioux River (HUC 102300030804)
Other EPA IDs (FRS)	RCRA handler IAD000671545

Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.

Effluent limits and exceedances

9Pollutants on file
0Under a numeric limit
9With 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	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
Nitrogen, ammonia total [as N]	52	46	June 30, 2025	564% over the limit
Flow, in conduit or thru treatment plant	12	12	October 31, 2018	49% over the limit
Solids, total suspended	19	5	October 31, 2024	19% over the limit
Oxygen, dissolved [DO]	10	5	July 31, 2026	24% over the limit
E. coli	5	3	May 31, 2025	658% over the limit
pH	7	1	March 31, 2016
BOD, carbonaceous [5 day, 20 C]	14	0
Toxicity [acute], Pimephales promelas [Fathead Minnow]	5	0
Toxicity [acute], Ceriodaphnia dubia	4	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 IA0021059.

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 IA0021059 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

This public-records page covers Clean Water Act discharge permit NPDES IA0021059 for SPENCER, CITY OF STP in Spencer, IA, held by City of Spencer, with a status of Effective and a Major Discharger class. The facts list 6 pollutants under a numeric limit and 6 pollutants with an effluent exceedance, out of 9 pollutants on file. The permit's listed issue date is March 1, 2019, and its expiration date is February 29, 2024, as recorded in EPA's permit file when the page was loaded.