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Clean Water Act discharge permit · NPDES MI0023710

NORTHFIELD TWP WWTP, Whitmore Lake, MI: NPDES MI0023710 discharge permit, effluent exceedances, inspections, penalties

NORTHFIELD TWP WWTP, held by Northfield Township, holds NPDES permit MI0023710, which discharges to Horseshoe Lake Drain. EPA’s file records it issued July 1, 2014 and expiring October 1, 2018. 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 filedNORTHFIELD TWP WWTP
Permittee as filedNorthfield Township
NPDES IDMI0023710
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
IssuedJuly 1, 2014
Expiration dateOctober 1, 2018
Issuing agencyState
AddressWhitmore Lake, MI 48189
Receiving waterHorseshoe Lake Drain
Receiving water impaired303(D) Listed
SubwatershedWhitmore Lake (HUC 040900050301)
Other EPA IDs (FRS)RCRA handler MIK724371612

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
Nitrogen, ammonia total [as N]1821111September 30, 2023455% over the limit
Solids, total suspended41593May 31, 2020125% over the limit
Selenium, total [as Se]2803May 31, 20221,567% over the limit
Coliform, fecal general1432February 29, 2024128% over the limit
Phosphorus, total [as P]4941May 31, 202031% over the limit
Chlorine, total residual1401July 31, 201068% over the limit
Solids, total32760
Arsenic, dry weight32760
Selenium, dry weight32760
Copper, dry weight32760
Cadmium, dry weight32760
Nitrogen, total Kjeldahl32760
Molybdenum, sludge, total, dry weight [as Mo]32760
Zinc, sludge, total, dry weight [as Zn]32760
Lead, sludge, total, dry weight [as Pb]32760
Nickel, sludge, total, dry weight [as Ni]32760
Nitrogen, sludge, total, dry weight [as N]32760
Mercury, sludge, total, dry weight [as Hg]32760
Potassium, sludge, total, dry weight [as K]32760
Phosphorus, sludge, total, dry weight [as P]32760
BOD, carbonaceous [5 day, 20 C]41560
Mercury, total [as Hg]41120
Oxygen, dissolved [DO]3870
Cyanide [A]4860
pH2780
Flow, in conduit or thru treatment plant2780
Azobenzene2600
Cadmium, total [as Cd]0330
Silver, total [as Ag]0300
Copper, total [as Cu]1150
Zinc, total [as Zn]050
Acrylonitrile200
Fluoranthene200
Hexachloroethane200
para-Chloro-meta-cresol200
Phenanthrene200
2,4,6-Trichlorophenol200
3,3'-Dichlorobenzidine200
Pentachlorophenol200
Benzidine200
Hexachlorobenzene200
Hexachlorobutadiene200

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 30, 2021Monitoring Violations - Failure to Monitor for Non-Toxicity RequirementsST6
November 30, 2021Management Practice Violations - Improper Operation and MaintenanceST6
November 30, 2021Monitoring Violations - Invalid/Unrepresentative SampleST6
November 30, 2021Monitoring Violations - Improper Analysis or Lab ErrorST6
July 8, 2021Monitoring Violations - Frequency of Sampling ViolationST6
October 31, 2018Reporting Violations - Late Submittal of DMRsST6
March 30, 2017Reporting Violations - Failure to NotifyST6
January 10, 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 September 15, 2026.

What this page shows

This public-records page covers NPDES permit MI0023710 for NORTHFIELD TWP WWTP in Whitmore Lake, MI, held by Northfield Township, which discharges to Horseshoe Lake Drain. The permit is listed as administratively continued, with a minor discharger class of 39, 6 pollutants under a numeric limit, and 6 pollutants with an effluent exceedance.