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Clean Water Act discharge permit · NPDES IA0024449

ALTA CITY OF STP, Alta, IA: NPDES IA0024449 discharge permit, effluent exceedances, inspections, penalties

ALTA CITY OF STP, held by CITY OF ALTA, holds NPDES permit IA0024449. EPA’s file records it issued July 1, 2020 and expiring June 30, 2025.

ALTA CITY OF STP, Alta, Iowa: Individual permit IA0024449, held by CITY OF ALTA; Publicly owned treatment works; Effective; issued July 1, 2020, term to June 30, 2025, by STA; Sewage Treatment Facilities.

  • Oxygen, dissolved [DO]: 1 limit, 15 violations of any kind, 9 effluent exceedances, latest September 30, 2025, largest 28% over the limit.
  • Copper, total [as Cu]: 4 limits, 25 violations of any kind, 7 effluent exceedances, latest January 31, 2024, largest 35% over the limit.
  • Chromium, hexavalent [as Cr]: 4 limits, 23 violations of any kind, 7 effluent exceedances, latest March 31, 2025, largest 269% over the limit.
  • Nitrogen, ammonia total [as N]: 48 limits, 14 violations of any kind, 2 effluent exceedances, latest July 31, 2024, largest 74% over the limit.
  • Solids, total suspended: 9 limits, 18 violations of any kind, 0 effluent exceedances.
  • BOD, carbonaceous [5 day, 20 C]: 4 limits, 18 violations of any kind, 0 effluent exceedances.
  • Cyanide, total [as CN]: 4 limits, 12 violations of any kind, 0 effluent exceedances.
  • pH: 5 limits, 9 violations of any kind, 0 effluent exceedances.
  • E. coli: 0 limits, 2 violations of any kind, 0 effluent exceedances.
  • BOD, 5-day, 20 deg. C: 5 limits, 0 violations of any kind, 0 effluent exceedances.
  • Nitrogen, total [as N]: 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.
  • Phosphorus, total [as P]: 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; 551 were issued before IA0024449.

Coverages issued nearest IA0024449

ALTA CITY OF STP among its neighbors

EPA’s permit file holds 2 discharge permits in the Little Maple Creek subwatershed (HUC 102300050104), IA0024449 among them. Its county holds 16, 2 of them major permits; IA0024449 is a minor permit.

Other permits in the Little Maple Creek subwatershed (HUC 102300050104)

Identity

Facility as filedALTA CITY OF STP
Permittee as filedCITY OF ALTA
NPDES IDIA0024449
Permit statusEffective
Permit typeIndividual permit
Discharger classMinor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedJuly 1, 2020
Expiration dateJune 30, 2025
Issuing agencySTA
AddressAlta, IA 51002
SubwatershedLittle Maple Creek (HUC 102300050104)
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
Oxygen, dissolved [DO]1159September 30, 202528% over the limit
Copper, total [as Cu]4257January 31, 202435% over the limit
Chromium, hexavalent [as Cr]4237March 31, 2025269% over the limit
Nitrogen, ammonia total [as N]48142July 31, 202474% over the limit
Solids, total suspended9180
BOD, carbonaceous [5 day, 20 C]4180
Cyanide, total [as CN]4120
pH590
E. coli020
BOD, 5-day, 20 deg. C500
Nitrogen, total [as N]500
Nitrogen, Kjeldahl, total [as N]500
Phosphorus, total [as P]500

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES IA0024449.

Inspections

EPA’s inspection file holds no inspection for NPDES IA0024449.

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 IA0024449.

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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 NPDES permit IA0024449, held by CITY OF ALTA for the ALTA CITY OF STP facility in Alta, IA, with a Minor Discharger classification and an Effective permit status. The facts list 13 pollutants on file, 12 under a numeric limit, 9 with a violation of any kind, and 4 with an effluent exceedance.