Clean Water Act discharge permit · NPDES IA0036471

HAMPTON CITY OF STP, Hampton, IA: NPDES IA0036471 discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MajorDischarger class
15Pollutants under a numeric limit
6Pollutants with an effluent exceedance

HAMPTON CITY OF STP, held by CITY OF HAMPTON, holds NPDES permit IA0036471. EPA’s file records it issued March 1, 2022 and expiring February 28, 2027. 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	HAMPTON CITY OF STP
Permittee as filed	CITY OF HAMPTON
NPDES ID	IA0036471
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, 2022
Expiration date	February 28, 2027
Issuing agency	STA
Address	Hampton, IA 50441
Subwatershed	Squaw Creek (HUC 070802040305)
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

15Pollutants on file
15Under a numeric limit
10With 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	Limits	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
Nitrogen, ammonia total [as N]	48	28	16	August 31, 2025	1,498% over the limit
Oxygen, dissolved [DO]	1	25	15	January 31, 2025	34% over the limit
pH	5	14	4	June 30, 2025
Solids, total suspended	9	23	3	March 31, 2023	1,144% over the limit
E. coli	1	3	2	May 31, 2024	198% over the limit
BOD, carbonaceous [5 day, 20 C]	4	21	1	March 31, 2023	4% over the limit
Nitrogen, total [as N]	7	6	0
Toxicity [acute], Ceriodaphnia dubia	1	6	0
Toxicity [acute], Pimephales promelas [Fathead Minnow]	1	6	0
Oil & Grease	2	2	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
Chloride [as Cl]	5	0	0
Copper, total [as Cu]	4	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 IA0036471.

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.

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 IA0036471 there.

Nearby on the register

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

This register page covers the Clean Water Act NPDES discharge permit IA0036471 for HAMPTON CITY OF STP in Hampton, IA, held by CITY OF HAMPTON as a major discharger and publicly owned treatment works, with permit status shown as Effective. The page lists 15 pollutants on file, 10 under a numeric limit, 10 with a violation of any kind, and 6 with an effluent exceedance.