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Clean Water Act discharge permit · NPDES MI0020893

MARINE CITY WWTP, Marine City, MI: NPDES MI0020893 discharge permit, effluent exceedances, inspections, penalties

MARINE CITY WWTP, held by City of Marine City, holds NPDES permit MI0020893, which discharges to St. Clair River. EPA’s file records it issued August 30, 2019 and expiring October 1, 2023. 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 filedMARINE CITY WWTP
Permittee as filedCity of Marine City
NPDES IDMI0020893
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
IssuedAugust 30, 2019
Expiration dateOctober 1, 2023
Issuing agencyState
AddressMarine City, MI 48039
Receiving waterSt. Clair River
SubwatershedSwartout Creek-Frontal Anchor Bay (HUC 040900020101)
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
Mercury, total [as Hg]63416February 29, 2020460% over the limit
Solids, total suspended4405July 31, 2024182% over the limit
Phosphorus, total [as P]4223December 31, 202455% over the limit
Coliform, fecal general2151July 31, 202421% over the limit
BOD, 5-day, percent removal281July 31, 202433% over the limit
Solids, suspended percent removal281July 31, 2024200% over the limit
Nitrogen, ammonia total [as N]0360
BOD, 5-day, 20 deg. C4310
pH2140
Flow, in conduit or thru treatment plant2140
Chlorine, total residual180
Oxygen, dissolved [DO]170
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
December 29, 2025Monitoring Violations - Improper Analysis or Lab ErrorST6
September 14, 2025Monitoring Violations - Analysis not ConductedST6
July 16, 2024Management Practice Violations - Improper Operation and MaintenanceST6
July 16, 2024Reporting Violations - Failure to NotifyST6
February 13, 2024Monitoring Violations - Invalid/Unrepresentative SampleST6
January 29, 2023Reporting Violations - Failure to Submit DMRsST6
December 25, 2022Reporting Violations - Failure to Submit DMRsST6
November 27, 2022Reporting Violations - Failure to Submit DMRsST6
August 11, 2022Monitoring Violations - Invalid/Unrepresentative SampleST6
March 31, 2022Reporting Violations - Failure to Submit DMRsST6
July 26, 2021Management Practice Violations - Failure to Maintain RecordsST6
July 26, 2021Monitoring Violations - Invalid/Unrepresentative SampleST6
January 11, 2017Monitoring 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 October 14, 2026.

What this page shows

This public-records page covers the Clean Water Act discharge permit NPDES MI0020893 for the MARINE CITY WWTP in Marine City, MI, held by the City of Marine City and discharging to the St. Clair River. The permit is listed as administratively continued and is a Major Discharger class permit, with 6 pollutants under a numeric limit and 25 pollutants with an effluent exceedance recorded in the file. The permit's status and dates reflect EPA's permit file as loaded on October 14, 2026.