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Clean Water Act discharge permit · NPDES MI0022926

FLINT WWTP, Flint, MI: NPDES MI0022926 discharge permit, effluent exceedances, inspections, penalties

FLINT WWTP, held by City of Flint, holds NPDES permit MI0022926, which discharges to Flint River. EPA’s file records it issued September 29, 2022 and expiring October 1, 2026. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filedFLINT WWTP
Permittee as filedCity of Flint
NPDES IDMI0022926
Permit statusEffective
Permit typeIndividual permit
Discharger classMajor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedSeptember 29, 2022
Expiration dateOctober 1, 2026
Issuing agencyState
AddressFlint, MI 48532
Receiving waterFlint River
Receiving water impaired303(D) Listed
SubwatershedCole Creek-Flint River (HUC 040802040501)

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
Mercury, total [as Hg]6128January 31, 201635% over the limit
BOD, carbonaceous [5 day, 20 C]16214July 31, 2023190% over the limit
Nitrogen, ammonia total [as N]16204August 31, 2025100% over the limit
Coliform, fecal general2113December 31, 201349,368% over the limit
Perfluorooctanesulfonate433May 31, 202675% over the limit
Chlorine, total residual062April 30, 2016216% over the limit
Phosphorus, total [as P]491June 30, 202210% over the limit
Cyanide, free [amenable to chlorination]011October 31, 200660% over the limit
pH280
Flow, in conduit or thru treatment plant280
Nitrogen, total Kjeldahl360
Nitrogen, sludge, total, dry weight [as N]360
Potassium, sludge, total, dry weight [as K]360
Phosphorus, sludge, total, dry weight [as P]360
Solids, total330
Arsenic, dry weight330
Selenium, dry weight330
Copper, dry weight330
Cadmium, dry weight330
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
Mercury, sludge, total, dry weight [as Hg]330
Solids, total suspended800

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
April 10, 2025Monitoring Violations - Failure to Monitor for Non-Toxicity RequirementsST6
November 13, 2023Pretreatment - Failure to Establish Local LimitsST6
November 13, 2023Pretreatment - Failure to Develop/Enforce StandardsST6
November 13, 2023Pretreatment - Failure to Enforce Against I/UST6
November 13, 2023Failure to issue/reissue control mechanisms to at least 90% of SIU/CIUs w/in 6 months (Level II)ST6
November 13, 2023Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II)ST6
March 15, 2022Pretreatment - Failure to Enforce Against I/UST6
March 15, 2022Pretreatment - Failure to Develop/Enforce StandardsST6
March 15, 2022Monitoring Violations - Failure to Monitor for Non-Toxicity RequirementsST6
March 15, 2022Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II)ST6
February 20, 2022WW SSO - Discharge to WatersST6
February 20, 2022Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environmentST6
September 17, 2020WW SSO - Discharge to WatersST6
September 17, 2020Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environmentST6
September 10, 2019WW SSO - Discharge to WatersST6
September 10, 2019Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environmentST6
September 7, 2018Effluent Violations - Narrative Effluent ViolationST6
January 1, 2017Pretreatment - Failure to Develop/Enforce StandardsST6
January 1, 2017Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II)ST6

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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How we handle your data → Privacy

EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID MI0022926 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.