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Clean Water Act discharge permit · NPDES MI0023752

OWOSSO/MID SHIAWASSEE CO WWTP, Owosso, MI: NPDES MI0023752 discharge permit, effluent exceedances, inspections, penalties

OWOSSO/MID SHIAWASSEE CO WWTP, held by City of Owosso, holds NPDES permit MI0023752, which discharges to Shiawassee River. EPA’s file records it issued September 24, 2018 and expiring October 1, 2021. 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 filedOWOSSO/MID SHIAWASSEE CO WWTP
Permittee as filedCity of Owosso
NPDES IDMI0023752
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, 2018
Expiration dateOctober 1, 2021
Issuing agencyState
AddressOwosso, MI 48867
Receiving waterShiawassee River
Receiving water impaired303(D) Listed
SubwatershedSawyer Drain-Shiawassee River (HUC 040802030207)
Program components on fileBiosolids, POTW, Pretreatment
NAICS221320 – Sewage Treatment Facilities
SIC4952 – Sewerage Systems
Other EPA IDs (FRS)RCRA handler MIR000043489

Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same 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
Solids, suspended percent removal21917February 28, 2018140% over the limit
Solids, total suspended41515May 31, 202050% over the limit
Coliform, fecal general22011May 31, 2024305% over the limit
Phosphorus, total [as P]488May 31, 201714% over the limit
BOD, carbonaceous [5 day, 20 C]16357August 31, 2024120% over the limit
Nitrogen, ammonia total [as N]10237October 31, 202570% over the limit
Hexachlorobenzene032November 30, 20231,400% over the limit
pH222November 30, 2011
BOD, carb-5 day, 20 deg C, percent removal211December 31, 20237% over the limit
Toxicity [chronic], Ceriodaphnia dubia011August 31, 200655% over the limit
Mercury, total [as Hg]6280
Oxygen, dissolved [DO]4180
Bromomethane0120
Perfluorooctanoic acid (PFOA)060
Perfluorooctanesulfonate060
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
Chloride [as Cl]020
Sulfate, total [as SO4]020
Chlorine, total residual110
Flow, in conduit or thru treatment plant200

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
March 9, 2026Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II)ST6
March 9, 2026Monitoring Violations - Failure to Monitor for Non-Toxicity RequirementsST6
February 21, 2026Reporting Violations - Late Submittal of DMRsST6
June 26, 2021Permit Violations - Discharge Without a Valid PermitST6
August 28, 2020Permit Violations - Discharge Without a Valid PermitST6
May 18, 2020Permit Violations - Discharge Without a Valid PermitST6
January 11, 2020Permit Violations - Discharge Without a Valid PermitST6

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 NPDES permit MI0023752 for the OWOSSO/MID SHIAWASSEE CO WWTP in Owosso, MI, held by City of Owosso, with a status of administratively continued and a major discharger class. The facts list 26 pollutants under a numeric limit and 10 pollutants with an effluent exceedance.