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Clean Water Act discharge permit · NPDES MI0023647

MT CLEMENS WWTP, Mount Clemens, MI: NPDES MI0023647 discharge permit, effluent exceedances, inspections, penalties

MT CLEMENS WWTP, held by City of Mount Clemens, holds NPDES permit MI0023647. EPA’s file records it issued May 17, 2017 and expiring October 1, 2020. 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 filedMT CLEMENS WWTP
Permittee as filedCity of Mount Clemens
NPDES IDMI0023647
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
IssuedMay 17, 2017
Expiration dateOctober 1, 2020
Issuing agencyState
AddressMount Clemens, MI 48043
Receiving water impaired303(D) Listed
SubwatershedCranberry Marsh Drain-Clinton River (HUC 040900030402)
Other EPA IDs (FRS)RCRA handler MID985576768

Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.

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
Mercury, total [as Hg]84130April 30, 20251,377% over the limit
Nitrogen, ammonia total [as N]26439May 31, 2025520% over the limit
pH6346August 31, 2011
Oxygen, dissolved [DO]5186August 31, 201912% over the limit
Phosphorus, total [as P]12752July 31, 200710% over the limit
Chlorine, total residual292January 31, 20061,005% over the limit
Coliform, fecal general6291May 31, 201117% over the limit
Solids, suspended percent removal471April 30, 2004120% over the limit
Solids, total suspended18440
Flow, in conduit or thru treatment plant8400
BOD, carbonaceous [5 day, 20 C]34320
BOD, 5-day, 20 deg. C0120
BOD, carb-5 day, 20 deg C, percent removal460
Solids, total300
Arsenic, dry weight300
Selenium, dry weight300
Copper, dry weight300
Cadmium, dry weight300
Nitrogen, total Kjeldahl300
Molybdenum, sludge, total, dry weight [as Mo]300
Zinc, sludge, total, dry weight [as Zn]300
Lead, sludge, total, dry weight [as Pb]300
Nickel, sludge, total, dry weight [as Ni]300
Nitrogen, sludge, total, dry weight [as N]300
Mercury, sludge, total, dry weight [as Hg]300
Potassium, sludge, total, dry weight [as K]300
Phosphorus, sludge, total, dry weight [as P]300

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
April 29, 2025Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II)ST6
January 1, 2022Pretreatment - Failure to Develop/Enforce StandardsST6
January 1, 2022Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II)ST6
October 31, 2021Reporting Violations - Late Submittal of DMRsST6
September 9, 2021Management Practice Violations - Improper Operation and MaintenanceST6
September 9, 2021Monitoring Violations - Invalid/Unrepresentative SampleST6
August 6, 2020Pretreatment - Failure to Develop/Enforce StandardsST6
August 6, 2020Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II)ST6
May 22, 2020Monitoring Violations - Failure to Monitor for Non-Toxicity RequirementsST6
May 7, 2019Permit Violations - Unapproved OperationST6
May 1, 2019Monitoring Violations - Improper Analysis or Lab ErrorST6

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 MI0023647 for the MT CLEMENS WWTP in Mount Clemens, MI, held by the City of Mount Clemens, with its permit status listed as administratively continued. The page lists 26 under discharger class, 8 pollutants under a numeric limit, and 8 pollutants with an effluent exceedance.