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Clean Water Act discharge permit · NPDES MI0045942

LEONI TWP WWTP, Jackson, MI: NPDES MI0045942 discharge permit, effluent exceedances, inspections, penalties

LEONI TWP WWTP, held by Leoni Township, holds NPDES permit MI0045942. EPA’s file records it issued November 2, 2018 and expiring October 1, 2023. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filedLEONI TWP WWTP
Permittee as filedLeoni Township
NPDES IDMI0045942
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
IssuedNovember 2, 2018
Expiration dateOctober 1, 2023
Issuing agencyState
AddressJackson, MI 49201
Receiving water impaired303(D) Listed
SubwatershedGrass Lake Drain (HUC 040500040102)

Cited to the EPA ICIS-NPDES permit file (ECHO 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
Nitrogen, ammonia total [as N]1216967September 30, 2022858% over the limit
Phosphorus, total [as P]47246August 31, 2022636% over the limit
BOD, carbonaceous [5 day, 20 C]1215236November 30, 2025272% over the limit
Oxygen, dissolved [DO]24425June 30, 201181% over the limit
Coliform, fecal general25715June 30, 20222,823% over the limit
Cyanide [A]4168December 31, 2021956% over the limit
Solids, total suspended8884June 30, 202261% over the limit
Static 48 Hr Chronic Pimphales Promelas033April 30, 2010243% over the limit
Copper, total [as Cu]0382April 30, 200623,321% over the limit
Solids, suspended percent removal2122April 30, 20085% over the limit
Toxicity, choice of species022March 31, 200950% over the limit
TU Static 24 Hr Acute Pimephales promelas022March 31, 2010160% over the limit
pH2451March 31, 2019
Chlorine, total residual0241January 31, 201013% over the limit
Flow, in conduit or thru treatment plant2420
Lindane0160
Toxicity [chronic], Ceriodaphnia dubia080
Toxicity [acute], Ceriodaphnia dubia050
Mercury, total [as Hg]440
Solids, total330
Arsenic, dry weight330
Selenium, dry weight330
Copper, dry weight330
Cadmium, dry weight330
Nitrogen, total Kjeldahl330
Molybdenum, sludge, total, dry weight [as Mo]330
Zinc, sludge, total, dry weight [as Zn]330
Lead, sludge, total, dry weight [as Pb]330
Nickel, sludge, total, dry weight [as Ni]330
Nitrogen, sludge, total, dry weight [as N]330
Mercury, sludge, total, dry weight [as Hg]330
Potassium, sludge, total, dry weight [as K]330
Phosphorus, sludge, total, dry weight [as P]330
Selenium, total [as Se]400

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
October 28, 2022Monitoring Violations - Failure to Monitor for Non-Toxicity RequirementsST6
October 29, 2021Monitoring Violations - Failure to Monitor for Non-Toxicity RequirementsST6
June 11, 2021WW SSO - Discharge to WatersST6
June 11, 2021Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environmentST6
July 21, 2020Reporting Violations - Late Submittal of DMRsST6
May 25, 2020WW SSO - Discharge to WatersST6
May 25, 2020Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environmentST6
January 11, 2020WW SSO - Discharge to WatersST6
January 11, 2020Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environmentST6
January 7, 2019Management Practice Violations - Improper Operation and MaintenanceST6

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 September 15, 2026.

What this page shows

This public-records page covers the Clean Water Act discharge permit NPDES MI0045942 for LEONI TWP WWTP in Jackson, MI, held by Leoni Township, with a permit status of administratively continued and a Major Discharger class. The facts list 26 pollutants under a numeric limit and 14 pollutants with an effluent exceedance.