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Clean Water Act discharge permit · NPDES IN0063959

MEXICO REGIONAL SEWER DISTRICT, Mexico, IN: NPDES IN0063959 discharge permit, effluent exceedances, inspections, penalties

MEXICO REGIONAL SEWER DISTRICT holds NPDES permit IN0063959, which discharges to Eel River. EPA’s file records it issued December 29, 2016 and expiring June 30, 2022.

MEXICO REGIONAL SEWER DISTRICT, Mexico, Indiana: Individual permit IN0063959; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued December 29, 2016, term to June 30, 2022, by IDEM; discharges to EEL RIVER.

  • Nitrogen, ammonia total [as N]: 8 limits, 12 violations of any kind, 12 effluent exceedances, latest February 28, 2023, largest 606% over the limit.
  • Solids, total suspended: 4 limits, 10 violations of any kind, 10 effluent exceedances, latest September 30, 2020, largest 137% over the limit.
  • E. coli, colony forming units [CFU]: 3 limits, 2 violations of any kind, 2 effluent exceedances, latest October 31, 2018, largest 104% over the limit.
  • Number of Events: 2 limits, 1 violation of any kind, 0 effluent exceedances.
  • BOD, carbonaceous [5 day, 20 C]: 4 limits, 0 violations of any kind, 0 effluent exceedances.
  • pH: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Oxygen, dissolved [DO]: 1 limit, 0 violations of any kind, 0 effluent exceedances.
  • Flow, in conduit or thru treatment plant: 1 limit, 0 violations of any kind, 0 effluent exceedances.
  • BOD, carb-5 day, 20 deg C, percent removal: 1 limit, 0 violations of any kind, 0 effluent exceedances.
  • Solids, suspended percent removal: 1 limit, 0 violations of any kind, 0 effluent exceedances.
  • Flow, total: 1 limit, 0 violations of any kind, 0 effluent exceedances.
  • March 9, 2026: Evaluation (S).

Indiana holds 541 Publicly owned treatment works coverages of this permit type in EPA’s file; 56 were issued before IN0063959.

Coverages issued nearest IN0063959

MEXICO REGIONAL SEWER DISTRICT among its neighbors

EPA’s permit file holds 2 discharge permits in the Washonis Creek-Eel River subwatershed (HUC 051201040603), IN0063959 among them. Its county holds 38, 3 of them major permits; IN0063959 is a minor permit.

Other permits in the Washonis Creek-Eel River subwatershed (HUC 051201040603)

  • DENVER WWTP, Denver: IN0039934, minor permit, discharging to EEL R TO WABASH RIVER, permit term to July 31, 2023

Identity

Facility as filedMEXICO REGIONAL SEWER DISTRICT
Permittee as filedMEXICO REGIONAL SEWER DISTRICT
NPDES IDIN0063959
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
IssuedDecember 29, 2016
Expiration dateJune 30, 2022
Issuing agencyIDEM
AddressMexico, IN 46958
Receiving waterEEL RIVER
Receiving water impaired303(D) Listed
SubwatershedWashonis Creek-Eel River (HUC 051201040603)
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]81212February 28, 2023606% over the limit
Solids, total suspended41010September 30, 2020137% over the limit
E. coli, colony forming units [CFU]322October 31, 2018104% over the limit
Number of Events210
BOD, carbonaceous [5 day, 20 C]400
pH200
Oxygen, dissolved [DO]100
Flow, in conduit or thru treatment plant100
BOD, carb-5 day, 20 deg C, percent removal100
Solids, suspended percent removal100
Flow, total100

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES IN0063959.

Inspections

DateWhat EPA recordedAgency
March 9, 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

EPA’s informal enforcement file holds no action for NPDES IN0063959.

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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 IN0063959 held by Mexico Regional Sewer District in Mexico, IN, which discharges to Eel River and is administratively continued. The page lists 3 pollutants under a numeric limit and 3 pollutants with an effluent exceedance, with the permit status and dates as they stood when Velarion loaded the file on October 14, 2026.