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Clean Water Act discharge permit · NPDES IA0027448

LAKE MILLS CITY OF STP, Lake Mills, IA: NPDES IA0027448 discharge permit, effluent exceedances, inspections, penalties

LAKE MILLS CITY OF STP, held by CITY OF LAKE MILLS, holds NPDES permit IA0027448. EPA’s file records it issued March 1, 2017 and expiring February 28, 2022.

LAKE MILLS CITY OF STP, Lake Mills, Iowa: Individual permit IA0027448, held by CITY OF LAKE MILLS; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued March 1, 2017, term to February 28, 2022, by STA; Sewage Treatment Facilities.

  • pH: 5 limits, 108 violations of any kind, 98 effluent exceedances, latest April 30, 2026.
  • Nitrogen, ammonia total [as N]: 48 limits, 38 violations of any kind, 34 effluent exceedances, latest June 30, 2026, largest 166% over the limit.
  • Flow, in conduit or thru treatment plant: 0 limits, 33 violations of any kind, 27 effluent exceedances, latest September 30, 2016, largest 169% over the limit.
  • Oxygen, dissolved [DO]: 1 limit, 24 violations of any kind, 20 effluent exceedances, latest June 30, 2026, largest 82% over the limit.
  • BOD, carbonaceous [5 day, 20 C]: 96 limits, 15 violations of any kind, 15 effluent exceedances, latest April 30, 2026, largest 105% over the limit.
  • Solids, total suspended: 9 limits, 38 violations of any kind, 3 effluent exceedances, latest January 31, 2003, largest 21% over the limit.
  • Copper, total [as Cu]: 4 limits, 30 violations of any kind, 0 effluent exceedances.
  • Nickel, total [as Ni]: 4 limits, 14 violations of any kind, 0 effluent exceedances.
  • Nitrogen, total [as N]: 2 limits, 4 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.
  • Phosphorus, total [as P]: 5 limits, 0 violations of any kind, 0 effluent exceedances.
  • Chloride [as Cl]: 5 limits, 0 violations of any kind, 0 effluent exceedances.
  • March 27, 2026: State CWA Penalty AO (State), $6,000 state or local penalty.

Iowa holds 734 Publicly owned treatment works coverages of this permit type in EPA’s file; 193 were issued before IA0027448.

Coverages issued nearest IA0027448

LAKE MILLS CITY OF STP among its neighbors

EPA’s permit file holds 1 discharge permits in the Headwaters Beaver Creek subwatershed (HUC 070802030107), IA0027448 among them. Its county holds 5, 1 of them major permits; IA0027448 is a minor permit.

Identity

Facility as filedLAKE MILLS CITY OF STP
Permittee as filedCITY OF LAKE MILLS
NPDES IDIA0027448
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMinor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedMarch 1, 2017
Expiration dateFebruary 28, 2022
Issuing agencySTA
AddressLake Mills, IA 50450
SubwatershedHeadwaters Beaver Creek (HUC 070802030107)
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
pH510898April 30, 2026
Nitrogen, ammonia total [as N]483834June 30, 2026166% over the limit
Flow, in conduit or thru treatment plant03327September 30, 2016169% over the limit
Oxygen, dissolved [DO]12420June 30, 202682% over the limit
BOD, carbonaceous [5 day, 20 C]961515April 30, 2026105% over the limit
Solids, total suspended9383January 31, 200321% over the limit
Copper, total [as Cu]4300
Nickel, total [as Ni]4140
Nitrogen, total [as N]240
BOD, 5-day, 20 deg. C500
Nitrogen, Kjeldahl, total [as N]500
Phosphorus, total [as P]500
Chloride [as Cl]500

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES IA0027448.

Inspections

EPA’s inspection file holds no inspection for NPDES IA0027448.

Formal enforcement and penalties

1 formal actions, 1 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.

DateWhat EPA recordedAgencyFederal penaltyState or local penalty
March 27, 2026State CWA Penalty AOState$6,000

Informal enforcement

EPA’s informal enforcement file holds no action for NPDES IA0027448.

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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 IA0027448 for the Lake Mills City of STP in Lake Mills, Iowa, held by the City of Lake Mills and administratively continued past its February 28, 2022 expiration date. The page lists 12 under the Minor Discharger class, 6 pollutants under a numeric limit, and 6 pollutants with an effluent exceedance.