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Clean Water Act discharge permit · NPDES IN0040690

WALKERTON MUNICIPAL WWTP, Walkerton, IN: NPDES IN0040690 discharge permit, effluent exceedances, inspections, penalties

WALKERTON MUNICIPAL WWTP holds NPDES permit IN0040690, which discharges to Kankakee R Via Pine Creek. EPA’s file records it issued September 13, 2018 and expiring November 30, 2023.

WALKERTON MUNICIPAL WWTP, Walkerton, Indiana: Individual permit IN0040690; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued September 13, 2018, term to November 30, 2023, by IDEM; discharges to KANKAKEE R VIA PINE CREEK.

  • Nitrogen, ammonia total [as N]: 8 limits, 207 violations of any kind, 203 effluent exceedances, latest July 31, 2025, largest 564% over the limit.
  • BOD, carbonaceous [5 day, 20 C]: 4 limits, 24 violations of any kind, 16 effluent exceedances, latest March 31, 2015, largest 277% over the limit.
  • Solids, total suspended: 4 limits, 25 violations of any kind, 9 effluent exceedances, latest April 30, 2021, largest 206% over the limit.
  • Oxygen, dissolved [DO]: 1 limit, 7 violations of any kind, 3 effluent exceedances, latest September 30, 2015, largest 38% over the limit.
  • Chlorine, total residual: 0 limits, 3 violations of any kind, 3 effluent exceedances, latest June 30, 2007, largest 100% over the limit.
  • Phosphorus, total [as P]: 1 limit, 3 violations of any kind, 2 effluent exceedances, latest January 31, 2026, largest 30% over the limit.
  • E. coli, colony forming units [CFU]: 3 limits, 3 violations of any kind, 1 effluent exceedance, latest October 31, 2025, largest 10% over the limit.
  • Flow, in conduit or thru treatment plant: 2 limits, 10 violations of any kind, 0 effluent exceedances.
  • pH: 2 limits, 8 violations of any kind, 0 effluent exceedances.
  • Flow, wastewater by-passing trtmnt plant: 0 limits, 3 violations of any kind, 0 effluent exceedances.
  • Flow, total: 1 limit, 2 violations of any kind, 0 effluent exceedances.
  • Number of Events: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • June 10, 2026: Effluent Violations - Numeric effluent violation (ST6).
  • June 10, 2026: Evaluation (S).
  • June 10, 2026: Notice of Noncompliance Issued (State).

Indiana holds 541 Publicly owned treatment works coverages of this permit type in EPA’s file; 232 were issued before IN0040690.

Coverages issued nearest IN0040690

WALKERTON MUNICIPAL WWTP among its neighbors

EPA’s permit file holds 5 discharge permits in the Peter Sarber Ditch-Pine Creek subwatershed (HUC 071200010103), IN0040690 among them. Its county holds 73, 3 of them major permits; IN0040690 is a minor permit.

Other permits in the Peter Sarber Ditch-Pine Creek subwatershed (HUC 071200010103)

Identity

Facility as filedWALKERTON MUNICIPAL WWTP
Permittee as filedWALKERTON MUNICIPAL WWTP
NPDES IDIN0040690
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
IssuedSeptember 13, 2018
Expiration dateNovember 30, 2023
Issuing agencyIDEM
AddressWalkerton, IN 46574
Receiving waterKANKAKEE R VIA PINE CREEK
SubwatershedPeter Sarber Ditch-Pine Creek (HUC 071200010103)
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]8207203July 31, 2025564% over the limit
BOD, carbonaceous [5 day, 20 C]42416March 31, 2015277% over the limit
Solids, total suspended4259April 30, 2021206% over the limit
Oxygen, dissolved [DO]173September 30, 201538% over the limit
Chlorine, total residual033June 30, 2007100% over the limit
Phosphorus, total [as P]132January 31, 202630% over the limit
E. coli, colony forming units [CFU]331October 31, 202510% over the limit
Flow, in conduit or thru treatment plant2100
pH280
Flow, wastewater by-passing trtmnt plant030
Flow, total120
Number of Events200

Inspections, violations and enforcement

DateWhat EPA recordedAgency
June 10, 2026Effluent Violations - Numeric effluent violationST6

Inspections

DateWhat EPA recordedAgency
June 10, 2026EvaluationS

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

DateWhat EPA recordedAgency
June 10, 2026Notice of Noncompliance IssuedState

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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 discharge permit NPDES IN0040690 for WALKERTON MUNICIPAL WWTP in Walkerton, IN, which discharges to KANKAKEE R VIA PINE CREEK within the Peter Sarber Ditch-Pine Creek watershed (HUC 071200010103). The permit is listed as administratively continued, a Minor Discharger class, with 10 pollutants under a numeric limit and 7 pollutants with an effluent exceedance.