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Clean Water Act discharge permit · NPDES IN0021580

MONON WWTP, Monon, IN: NPDES IN0021580 discharge permit, effluent exceedances, inspections, penalties

MONON WWTP, held by MONON MUNICIPAL WWTP, holds NPDES permit IN0021580, which discharges to Tippecanoe R Via Mckillop Creek. EPA’s file records it issued August 23, 2016 and expiring November 30, 2021.

MONON WWTP, Monon, Indiana: Individual permit IN0021580, held by MONON MUNICIPAL WWTP; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued August 23, 2016, term to November 30, 2021, by IDEM; discharges to TIPPECANOE R VIA MCKILLOP CREEK.

  • Nitrogen, ammonia total [as N]: 8 limits, 167 violations of any kind, 143 effluent exceedances, latest June 30, 2026, largest 1,140% over the limit.
  • Solids, total suspended: 8 limits, 127 violations of any kind, 105 effluent exceedances, latest June 30, 2026, largest 1,020% over the limit.
  • Chlorine, total residual: 4 limits, 87 violations of any kind, 75 effluent exceedances, latest June 30, 2026, largest 3,435% over the limit.
  • Phosphorus, total percent removal: 1 limit, 57 violations of any kind, 51 effluent exceedances, latest July 31, 2024, largest 189% over the limit.
  • E. coli, colony forming units [CFU]: 3 limits, 61 violations of any kind, 50 effluent exceedances, latest April 30, 2026, largest 50,460% over the limit.
  • Phosphorus, total [as P]: 1 limit, 50 violations of any kind, 37 effluent exceedances, latest October 31, 2024, largest 692% over the limit.
  • BOD, carbonaceous [5 day, 20 C]: 8 limits, 39 violations of any kind, 19 effluent exceedances, latest June 30, 2026, largest 126% over the limit.
  • Oxygen, dissolved [DO]: 2 limits, 11 violations of any kind, 6 effluent exceedances, latest August 31, 2025, largest 80% over the limit.
  • pH: 2 limits, 13 violations of any kind, 3 effluent exceedances, latest July 31, 2021.
  • Solids, suspended percent removal: 1 limit, 4 violations of any kind, 3 effluent exceedances, latest August 31, 2023, largest 100% over the limit.
  • BOD, carb-5 day, 20 deg C, percent removal: 1 limit, 3 violations of any kind, 2 effluent exceedances, latest May 31, 2019, largest 20% over the limit.
  • Flow, in conduit or thru treatment plant: 2 limits, 10 violations of any kind, 0 effluent exceedances.
  • Flow, total: 1 limit, 3 violations of any kind, 0 effluent exceedances.
  • Flow, wastewater by-passing trtmnt plant: 0 limits, 3 violations of any kind, 0 effluent exceedances.
  • Number of Events: 2 limits, 2 violations of any kind, 0 effluent exceedances.
  • Bypass valve: 0 limits, 1 violation of any kind, 0 effluent exceedances.
  • June 25, 2026: Management Practice Violations - Inflow/Infiltration (I/I) (ST6).
  • June 25, 2026: Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment (ST6).
  • June 25, 2026: Management Practice Violations - Improper Operation and Maintenance (ST6).
  • June 25, 2026: Effluent Violations - Numeric effluent violation (ST6).
  • June 25, 2026: Management Practice Violations - Failure to Maintain Records (ST6).
  • June 25, 2026: Reporting Violations - Improper/ Incorrect Reporting (ST6).
  • June 25, 2026: Evaluation (S).
  • June 25, 2026: Notice of Noncompliance Issued (State).

Indiana holds 541 Publicly owned treatment works coverages of this permit type in EPA’s file; 30 were issued before IN0021580.

Coverages issued nearest IN0021580

MONON WWTP among its neighbors

EPA’s permit file holds 5 discharge permits in the McKillip Ditch subwatershed (HUC 051201061103), IN0021580 among them. Its county holds 32, 1 of them major permits; IN0021580 is a minor permit.

Other permits in the McKillip Ditch subwatershed (HUC 051201061103)

Identity

Facility as filedMONON WWTP
Permittee as filedMONON MUNICIPAL WWTP
NPDES IDIN0021580
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
IssuedAugust 23, 2016
Expiration dateNovember 30, 2021
Issuing agencyIDEM
AddressMonon, IN 47959
Receiving waterTIPPECANOE R VIA MCKILLOP CREEK
SubwatershedMcKillip Ditch (HUC 051201061103)
Other EPA IDs (FRS)RCRA handler IND000708529

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]8167143June 30, 20261,140% over the limit
Solids, total suspended8127105June 30, 20261,020% over the limit
Chlorine, total residual48775June 30, 20263,435% over the limit
Phosphorus, total percent removal15751July 31, 2024189% over the limit
E. coli, colony forming units [CFU]36150April 30, 202650,460% over the limit
Phosphorus, total [as P]15037October 31, 2024692% over the limit
BOD, carbonaceous [5 day, 20 C]83919June 30, 2026126% over the limit
Oxygen, dissolved [DO]2116August 31, 202580% over the limit
pH2133July 31, 2021
Solids, suspended percent removal143August 31, 2023100% over the limit
BOD, carb-5 day, 20 deg C, percent removal132May 31, 201920% over the limit
Flow, in conduit or thru treatment plant2100
Flow, total130
Flow, wastewater by-passing trtmnt plant030
Number of Events220
Bypass valve010

Inspections, violations and enforcement

DateWhat EPA recordedAgency
June 25, 2026Management Practice Violations - Inflow/Infiltration (I/I)ST6
June 25, 2026Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environmentST6
June 25, 2026Management Practice Violations - Improper Operation and MaintenanceST6
June 25, 2026Effluent Violations - Numeric effluent violationST6
June 25, 2026Management Practice Violations - Failure to Maintain RecordsST6
June 25, 2026Reporting Violations - Improper/ Incorrect ReportingST6

Inspections

DateWhat EPA recordedAgency
June 25, 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 25, 2026Notice of Noncompliance IssuedState

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Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

What this page shows

This public-records page covers Clean Water Act discharge permit NPDES IN0021580 for the MONON WWTP in Monon, IN, held by MONON MUNICIPAL WWTP and discharging to Tippecanoe R via Mckillop Creek. The register lists a permit status of administratively continued, a minor discharger class, 14 pollutants under a numeric limit, and 11 pollutants with an effluent exceedance.