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Clean Water Act discharge permit · NPDES IA0036935

MONTEZUMA CITY OF STP, Montezuma, IA: NPDES IA0036935 discharge permit, effluent exceedances, inspections, penalties

MONTEZUMA CITY OF STP, held by CITY OF MONTEZUMA, holds NPDES permit IA0036935. EPA’s file records it issued September 1, 2021 and expiring August 31, 2026.

MONTEZUMA CITY OF STP, Montezuma, Iowa: Individual permit IA0036935, held by CITY OF MONTEZUMA; Publicly owned treatment works; Effective; issued September 1, 2021, term to August 31, 2026, by STA; Sewage Treatment Facilities.

  • Oxygen, dissolved [DO]: 1 limit, 15 violations of any kind, 12 effluent exceedances, latest July 31, 2016, largest 80% over the limit.
  • Nitrogen, ammonia total [as N]: 48 limits, 10 violations of any kind, 10 effluent exceedances, latest February 28, 2026, largest 154% over the limit.
  • Solids, total suspended: 9 limits, 5 violations of any kind, 3 effluent exceedances, latest July 31, 2016, largest 480% over the limit.
  • pH: 5 limits, 4 violations of any kind, 1 effluent exceedance, latest May 31, 2015.
  • BOD, carbonaceous [5 day, 20 C]: 4 limits, 4 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.
  • Toxicity [acute], Ceriodaphnia dubia: 1 limit, 0 violations of any kind, 0 effluent exceedances.
  • Toxicity [acute], Pimephales promelas [Fathead Minnow]: 1 limit, 0 violations of any kind, 0 effluent exceedances.

Iowa holds 734 Publicly owned treatment works coverages of this permit type in EPA’s file; 655 were issued before IA0036935. CITY OF MONTEZUMA holds 2 permits in Iowa.

Other permits held by CITY OF MONTEZUMA

Coverages issued nearest IA0036935

MONTEZUMA CITY OF STP among its neighbors

EPA’s permit file holds 2 discharge permits in the Moon Creek subwatershed (HUC 070801060402), IA0036935 among them. Its county holds 12, 1 of them major permits; IA0036935 is a minor permit.

Other permits in the Moon Creek subwatershed (HUC 070801060402)

Identity

Facility as filedMONTEZUMA CITY OF STP
Permittee as filedCITY OF MONTEZUMA
NPDES IDIA0036935
Permit statusEffective
Permit typeIndividual permit
Discharger classMinor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedSeptember 1, 2021
Expiration dateAugust 31, 2026
Issuing agencySTA
AddressMontezuma, IA 50171
SubwatershedMoon Creek (HUC 070801060402)
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]11512July 31, 201680% over the limit
Nitrogen, ammonia total [as N]481010February 28, 2026154% over the limit
Solids, total suspended953July 31, 2016480% over the limit
pH541May 31, 2015
BOD, carbonaceous [5 day, 20 C]440
Nitrogen, total [as N]1000
Phosphorus, total [as P]1000
BOD, 5-day, 20 deg. C500
Nitrogen, Kjeldahl, total [as N]500
Toxicity [acute], Ceriodaphnia dubia100
Toxicity [acute], Pimephales promelas [Fathead Minnow]100

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES IA0036935.

Inspections

EPA’s inspection file holds no inspection for NPDES IA0036935.

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 IA0036935.

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Nearby on the register

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

What this page shows

The page covers NPDES permit IA0036935 for MONTEZUMA CITY OF STP in Montezuma, IA, held by CITY OF MONTEZUMA as a Minor Discharger publicly owned treatment works with a status of Effective. It lists 11 pollutants on file, 11 under a numeric limit, 5 with a violation of any kind, and 4 with an effluent exceedance.