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Clean Water Act discharge permit · NPDES MI0021334

LUDINGTON WWTP, Ludington, MI: NPDES MI0021334 discharge permit, effluent exceedances, inspections, penalties

LUDINGTON WWTP, held by City of Ludington, holds NPDES permit MI0021334, which discharges to Pere Marquette River. EPA’s file records it issued September 24, 2015 and expiring September 30, 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 filedLUDINGTON WWTP
Permittee as filedCity of Ludington
NPDES IDMI0021334
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
IssuedSeptember 24, 2015
Expiration dateSeptember 30, 2020
Issuing agencyState
AddressLudington, MI 49431
Receiving waterPere Marquette River
SubwatershedPere Marquette Lake-Pere Marquette River (HUC 040601010509)

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]114942June 30, 2018188% over the limit
Copper, total [as Cu]83725July 31, 2021500% over the limit
Solids, suspended percent removal43225April 30, 202060% over the limit
Mercury, total [as Hg]122712September 30, 202224% over the limit
Phosphorus, total [as P]8288July 31, 202534% over the limit
Solids, total suspended8466February 28, 202560% over the limit
Chlorine, total residual2156November 30, 2025532% over the limit
pH4265April 30, 2019
Coliform, fecal general4233January 31, 202640% over the limit
BOD, carbonaceous [5 day, 20 C]16422February 29, 201672% over the limit
Toxicity [chronic], Ceriodaphnia dubia082August 31, 200638% over the limit
Toxicity, choice of species4540
Toxicity [acute], Ceriodaphnia dubia2270
Perfluorooctanoic acid (PFOA)0240
Flow, in conduit or thru treatment plant4200
BOD, carb-5 day, 20 deg C, percent removal4100
Oxygen, dissolved [DO]3100
Perfluorooctanesulfonate080
Solids, total360
Arsenic, dry weight360
Selenium, dry weight360
Copper, dry weight360
Cadmium, dry weight360
Nitrogen, total Kjeldahl360
Molybdenum, sludge, total, dry weight [as Mo]360
Zinc, sludge, total, dry weight [as Zn]360
Lead, sludge, total, dry weight [as Pb]360
Nickel, sludge, total, dry weight [as Ni]360
Nitrogen, sludge, total, dry weight [as N]360
Mercury, sludge, total, dry weight [as Hg]360
Potassium, sludge, total, dry weight [as K]360
Phosphorus, sludge, total, dry weight [as P]360
Toxicity, final conc toxicity units050
Cadmium, total [as Cd]010
Static 48 Hr Chronic Pimphales Promelas200
TU Static 24 Hr Acute Pimephales promelas100

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 25, 2024Monitoring Violations - Analysis not ConductedST6
October 3, 2022Monitoring Violations - Failure to Monitor for Non-Toxicity RequirementsST6
December 8, 2021Pretreatment - Failure to Develop/Enforce StandardsST6
December 8, 2021Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II)ST6
December 2, 2019Monitoring Violations - Failure to Monitor for Non-Toxicity RequirementsST6
December 2, 2019Monitoring Violations - Invalid/Unrepresentative SampleST6
August 9, 2017Pretreatment - Failure to Establish Local LimitsST6
August 9, 2017Pretreatment - Failure to Enforce Against I/UST6
August 9, 2017Failure to issue/reissue control mechanisms to at least 90% of SIU/CIUs w/in 6 months (Level II)ST6
August 9, 2017Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II)ST6

Inspections

DateWhat EPA recordedAgency
September 22, 2026AuditS
September 16, 2026Reconnaissance without SamplingS

Formal enforcement and penalties

0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.

Informal enforcement

DateWhat EPA recordedAgency
March 26, 2026Letter of Violation/ Warning LetterState

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

The Ludington WWTP is covered by NPDES permit MI0021334, held by the City of Ludington and discharging to the Pere Marquette River, with its status and dates as they stood in EPA's permit file. The page lists 31 under a numeric limit and 11 pollutants with an effluent exceedance, within the Pere Marquette Lake-Pere Marquette River watershed (HUC 040601010509).