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Clean Water Act discharge permit · NPDES MI0020494

PLAINWELL WWTP, Plainwell, MI: NPDES MI0020494 discharge permit, effluent exceedances, inspections, penalties

PLAINWELL WWTP, held by City of Plainwell, holds NPDES permit MI0020494. EPA’s file records it issued June 9, 2016 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 filedPLAINWELL WWTP
Permittee as filedCity of Plainwell
NPDES IDMI0020494
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMinor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedJune 9, 2016
Expiration dateOctober 1, 2020
Issuing agencyState
AddressPlainwell, MI 49080
Receiving water impaired303(D) Listed
SubwatershedSilver Creek-Kalamazoo River (HUC 040500030607)

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
BOD, carbonaceous [5 day, 20 C]810012September 30, 2025107% over the limit
Solids, total suspended4484August 31, 202311% over the limit
Coliform, fecal general2331March 31, 202630% over the limit
pH2171July 31, 2016
Oxygen, dissolved [DO]1121June 30, 201410% over the limit
Mercury, total [as Hg]6900
Phosphorus, total [as P]4630
Flow, in conduit or thru treatment plant2320
Solids, suspended percent removal2220
Nitrogen, ammonia total [as N]3160
Chlorine, total residual1160
BOD, carb-5 day, 20 deg C, percent removal280
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

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
January 29, 2025Management Practice Violations - Improper Operation and MaintenanceST6
September 16, 2024Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II)ST6
October 31, 2021Reporting Violations - Late Submittal of DMRsST6
August 25, 2021Pretreatment - Failure to Develop/Enforce StandardsST6
August 25, 2021Monitoring Violations - Failure to Monitor for Non-Toxicity RequirementsST6
August 25, 2021Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II)ST6
September 15, 2020WW Storm Water Non-Construction - Failure to develop any or adequate SWPPP/SWMPST6
October 31, 2019Reporting Violations - Late Submittal of DMRsST6
March 28, 2018Pretreatment - Failure to Develop/Enforce StandardsST6
March 28, 2018Monitoring Violations - Improper Analysis or Lab ErrorST6
March 28, 2018Reporting Violations - Failure to Submit DMRsST6
March 28, 2018Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II)ST6
March 26, 2018Permit Violations - Discharge Without a Valid PermitST6
March 26, 2018Management Practice Violations - Failure to Maintain RecordsST6

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 Clean Water Act discharge permit NPDES MI0020494 for PLAINWELL WWTP in Plainwell, MI, held by City of Plainwell and listed as administratively continued. The page lists 26 pollutants on file, 26 under a numeric limit, 26 with a violation of any kind, and 5 with an effluent exceedance.