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Clean Water Act discharge permit · NPDES IA0028525

NEW HAMPTON CITY OF STP, New Hampton, IA: NPDES IA0028525 discharge permit, effluent exceedances, inspections, penalties

NEW HAMPTON CITY OF STP, held by CITY OF NEW HAMPTON, holds NPDES permit IA0028525. EPA’s file records it issued June 1, 2019 and expiring May 31, 2024.

NEW HAMPTON CITY OF STP, New Hampton, Iowa: Individual permit IA0028525, held by CITY OF NEW HAMPTON; Publicly owned treatment works; Effective; issued June 1, 2019, term to May 31, 2024, by STA; Sewage Treatment Facilities.

  • Nitrogen, ammonia total [as N]: 96 limits, 46 violations of any kind, 38 effluent exceedances, latest August 31, 2025, largest 399% over the limit.
  • Copper, total [as Cu]: 4 limits, 35 violations of any kind, 31 effluent exceedances, latest June 30, 2026, largest 545% over the limit.
  • Solids, total suspended: 9 limits, 32 violations of any kind, 20 effluent exceedances, latest March 31, 2020, largest 64% over the limit.
  • Aluminum, total [as Al]: 4 limits, 27 violations of any kind, 19 effluent exceedances, latest February 28, 2026, largest 184% over the limit.
  • BOD, carbonaceous [5 day, 20 C]: 4 limits, 18 violations of any kind, 6 effluent exceedances, latest February 28, 2025, largest 47% over the limit.
  • pH: 8 limits, 12 violations of any kind, 4 effluent exceedances, latest November 30, 2015.
  • Oxygen, dissolved [DO]: 1 limit, 6 violations of any kind, 2 effluent exceedances, latest July 31, 2025, largest 10% over the limit.
  • Toxicity [acute], Pimephales promelas [Fathead Minnow]: 1 limit, 5 violations of any kind, 0 effluent exceedances.
  • Toxicity [acute], Ceriodaphnia dubia: 1 limit, 3 violations of any kind, 0 effluent exceedances.
  • Nitrogen, total [as N]: 10 limits, 0 violations of any kind, 0 effluent exceedances.
  • Phosphorus, total [as P]: 10 limits, 0 violations of any kind, 0 effluent exceedances.
  • BOD, 5-day, 20 deg. C: 5 limits, 0 violations of any kind, 0 effluent exceedances.
  • Nitrogen, Kjeldahl, total [as N]: 5 limits, 0 violations of any kind, 0 effluent exceedances.

Iowa holds 734 Publicly owned treatment works coverages of this permit type in EPA’s file; 444 were issued before IA0028525. CITY OF NEW HAMPTON holds 2 permits in Iowa.

Other permits held by CITY OF NEW HAMPTON

Coverages issued nearest IA0028525

NEW HAMPTON CITY OF STP among its neighbors

EPA’s permit file holds 2 discharge permits in the Spring Branch-Little Wapsipinicon River subwatershed (HUC 070801020103), IA0028525 among them. Its county holds 7, 1 of them major permits; IA0028525 is a major permit.

Other permits in the Spring Branch-Little Wapsipinicon River subwatershed (HUC 070801020103)

Identity

Facility as filedNEW HAMPTON CITY OF STP
Permittee as filedCITY OF NEW HAMPTON
NPDES IDIA0028525
Permit statusEffective
Permit typeIndividual permit
Discharger classMajor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedJune 1, 2019
Expiration dateMay 31, 2024
Issuing agencySTA
AddressNew Hampton, IA 50659
SubwatershedSpring Branch-Little Wapsipinicon River (HUC 070801020103)
Program components on fileBiosolids, POTW
NAICS221320 – Sewage Treatment Facilities
SIC4952 – Sewerage Systems

Effluent limits and exceedances

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 measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
Nitrogen, ammonia total [as N]964638August 31, 2025399% over the limit
Copper, total [as Cu]43531June 30, 2026545% over the limit
Solids, total suspended93220March 31, 202064% over the limit
Aluminum, total [as Al]42719February 28, 2026184% over the limit
BOD, carbonaceous [5 day, 20 C]4186February 28, 202547% over the limit
pH8124November 30, 2015
Oxygen, dissolved [DO]162July 31, 202510% over the limit
Toxicity [acute], Pimephales promelas [Fathead Minnow]150
Toxicity [acute], Ceriodaphnia dubia130
Nitrogen, total [as N]1000
Phosphorus, total [as P]1000
BOD, 5-day, 20 deg. C500
Nitrogen, Kjeldahl, total [as N]500

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES IA0028525.

Inspections

EPA’s inspection file holds no inspection for NPDES IA0028525.

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 IA0028525.

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Nearby on the register

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

What this page shows

This public-records page covers Clean Water Act NPDES permit IA0028525 for the NEW HAMPTON CITY OF STP in New Hampton, IA, held by CITY OF NEW HAMPTON, with a status of Effective and a Major discharger class. The permit was issued June 1, 2019 and expires May 31, 2024, and the page lists 13 pollutants on file, 7 pollutants under a numeric limit, and 9 pollutants with an effluent exceedance.