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Clean Water Act discharge permit · NPDES MI0021571

MILAN WWTP, Milan, MI: NPDES MI0021571 discharge permit, effluent exceedances, inspections, penalties

MILAN WWTP, held by City of Milan, holds NPDES permit MI0021571, which discharges to Saline River. EPA’s file records it issued July 23, 2020 and expiring October 1, 2024. 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 filedMILAN WWTP
Permittee as filedCity of Milan
NPDES IDMI0021571
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 23, 2020
Expiration dateOctober 1, 2024
Issuing agencyState
AddressMilan, MI 48160
Receiving waterSaline River
Receiving water impaired303(D) Listed
SubwatershedSaline River (HUC 041000020409)
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
BOD, carbonaceous [5 day, 20 C]165732June 30, 2026910% over the limit
Solids, total suspended124319April 30, 20261,304% over the limit
Mercury, total [as Hg]63812July 31, 201763% over the limit
Nitrogen, ammonia total [as N]163010August 31, 2023180% over the limit
Cyanide [A]2368February 28, 2017263% over the limit
Phosphorus, total [as P]4237May 31, 2024148% over the limit
Solids, suspended percent removal264March 31, 202373% over the limit
pH2131February 28, 2013
Coliform, fecal general2131August 31, 202450% over the limit
Toxicity, choice of species211June 30, 2016619% over the limit
Flow, in conduit or thru treatment plant2120
Perfluorooctanoic acid (PFOA)470
Perfluorooctanesulfonate440
Oxygen, dissolved [DO]340
Chlorine, total residual040
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
Copper, total [as Cu]420
Toxicity [chronic], Ceriodaphnia dubia010
Selenium, total [as Se]400
BOD, carb-5 day, 20 deg C, percent removal200
Toxicity [acute], Ceriodaphnia dubia100

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
November 19, 2024Monitoring Violations - Improper Analysis or Lab ErrorST6
November 13, 2024Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II)ST6
August 29, 2024Management Practice Violations - Failure to Maintain RecordsST6
May 13, 2024Management Practice Violations - Failure to Maintain RecordsST6
January 3, 2024Management Practice Violations - Failure to Maintain RecordsST6
October 18, 2023Management Practice Violations - Improper Operation and MaintenanceST6
August 10, 2022Management Practice Violations - Improper Operation and MaintenanceST6
January 21, 2019Reporting Violations - Late Submittal of DMRsST6

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 the Clean Water Act discharge permit NPDES MI0021571 for MILAN WWTP in Milan, MI, held by City of Milan, which discharges to Saline River and is administratively continued past its October 1, 2024 expiration date. The page lists a Major Discharger class, 10 pollutants under a numeric limit, and 32 pollutants with an effluent exceedance.