Clean Water Act discharge permit · NPDES IA0042650

WATERLOO CITY OF STP, Waterloo, IA: NPDES IA0042650 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
0Pollutants under a numeric limit
5Pollutants with an effluent exceedance

WATERLOO CITY OF STP, held by CITY OF WATERLOO, holds NPDES permit IA0042650. EPA’s file records it issued April 1, 2016 and expiring March 31, 2021. 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	WATERLOO CITY OF STP
Permittee as filed	CITY OF WATERLOO
NPDES ID	IA0042650
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	April 1, 2016
Expiration date	March 31, 2021
Issuing agency	STA
Address	Waterloo, IA 50702
Receiving water impaired	303(D) Listed
Subwatershed	Sink Creek-Cedar River (HUC 070802050906)
Program components on file	Biosolids, POTW, Pretreatment
NAICS	221320 – Sewage Treatment Facilities
SIC	4952 – Sewerage Systems
Other EPA IDs (FRS)	RCRA handler IAP000001275; ICIS-AIR source IA0009000000701182

Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.

Effluent limits and exceedances

8Pollutants on file
0Under a numeric limit
8With 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	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
pH	16	11	July 31, 2026
BOD, 5-day, 20 deg. C	4	4	March 31, 2017	60% over the limit
BOD, carbonaceous [5 day, 20 C]	21	2	March 31, 2026	204% over the limit
Solids, total suspended	11	2	January 31, 2025	31% over the limit
E. coli	2	2	August 31, 2025	61% over the limit
Nitrogen, ammonia total [as N]	15	0
Nitrogen, total [as N]	2	0
Toxicity [acute], Ceriodaphnia dubia	1	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 IA0042650.

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 IA0042650 there.

Nearby on the register

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

This public-records page covers Clean Water Act discharge permit NPDES IA0042650, held by CITY OF WATERLOO for the WATERLOO CITY OF STP in Waterloo, IA, and listed as administratively continued with a Major discharger class. The facts report 0 pollutants under a numeric limit and 5 pollutants with an effluent exceedance, with the permit dated April 1, 2016 and expiring March 31, 2021, in the Sink Creek-Cedar River subwatershed (HUC 070802050906).