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Clean Water Act discharge permit · NPDES MI0026191

GROSSE ILE TWP WWTP, Grosse Ile Township, MI: NPDES MI0026191 discharge permit, effluent exceedances, inspections, penalties

GROSSE ILE TWP WWTP, held by Grosse Ile Township, holds NPDES permit MI0026191, which discharges to Detroit River. EPA’s file records it issued July 29, 2016 and expiring October 1, 2021. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filedGROSSE ILE TWP WWTP
Permittee as filedGrosse Ile Township
NPDES IDMI0026191
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMajor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedJuly 29, 2016
Expiration dateOctober 1, 2021
Issuing agencyState
AddressGrosse Ile Township, MI 48138
Receiving waterDetroit River
Program components on fileBiosolids, POTW
NAICS221320 – Sewage Treatment Facilities
SIC4952 – Sewerage Systems

Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.

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
Solids, total suspended49074April 30, 2026335% over the limit
Coliform, fecal general24638May 31, 2016515% over the limit
Phosphorus, total [as P]44636April 30, 202653% over the limit
Solids, suspended percent removal24135May 31, 2025220% over the limit
Chlorine, total residual23633April 30, 2024100% over the limit
BOD, carb-5 day, 20 deg C, percent removal23225March 31, 2023120% over the limit
BOD, carbonaceous [5 day, 20 C]44315May 31, 201570% over the limit
Oxygen, dissolved [DO]183April 30, 202288% over the limit
Mercury, total [as Hg]6151February 28, 200611% over the limit
pH2100
Flow, in conduit or thru treatment plant2100
Nitrogen, ammonia total [as N]470
Copper, total [as Cu]030
Solids, total320
Arsenic, dry weight320
Selenium, dry weight320
Copper, dry weight320
Cadmium, dry weight320
Nitrogen, total Kjeldahl320
Molybdenum, sludge, total, dry weight [as Mo]320
Zinc, sludge, total, dry weight [as Zn]320
Lead, sludge, total, dry weight [as Pb]320
Nickel, sludge, total, dry weight [as Ni]320
Nitrogen, sludge, total, dry weight [as N]320
Mercury, sludge, total, dry weight [as Hg]320
Potassium, sludge, total, dry weight [as K]320
Phosphorus, sludge, total, dry weight [as P]320
Di-n-butyl phthalate400

Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.

Inspections, violations and enforcement

DateWhat EPA recordedAgency
May 22, 2025Monitoring Violations - Improper Analysis or Lab ErrorST6
May 22, 2025Monitoring Violations - Invalid/Unrepresentative SampleST6
May 19, 2020WW SSO - Discharge to WatersST6
May 19, 2020Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environmentST6
May 18, 2020WW SSO - Discharge to WatersST6
May 18, 2020Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environmentST6
March 28, 2020WW SSO - Discharge to WatersST6
March 28, 2020Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environmentST6
January 12, 2020WW SSO - Discharge to WatersST6
January 12, 2020Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environmentST6
February 20, 2018WW SSO - Discharge to WatersST6
February 20, 2018Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environmentST6

Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.

Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.

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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 MI0026191 for the GROSSE ILE TWP WWTP in Grosse Ile Township, MI, which discharges to the Detroit River and is administratively continued as a Major Discharger class facility. The page lists 27 pollutants under a numeric limit and 9 pollutants with an effluent exceedance.