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Clean Water Act discharge permit · NPDES WI0024597

MADISON METRO SEW DIST WWTF, Madison, WI: NPDES WI0024597 discharge permit, effluent exceedances, inspections, penalties

MADISON METRO SEW DIST WWTF, held by MADISON METROPOLITAN SEWERAGE, holds NPDES permit WI0024597, which discharges to Badfish Cr. EPA’s file records it issued April 1, 2004 and expiring March 31, 2009. 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 filedMADISON METRO SEW DIST WWTF
Permittee as filedMADISON METROPOLITAN SEWERAGE
NPDES IDWI0024597
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
IssuedApril 1, 2004
Expiration dateMarch 31, 2009
AddressMadison, WI 53713
Receiving waterBADFISH CR
Receiving water impaired303(D) Listed
SubwatershedLake Waubesa-Yahara River (HUC 070900020703)
Other EPA IDs (FRS)RCRA handler WIR000007344; ICIS-AIR source WI0000005502500223

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
Oxygen, dissolved [DO]63218April 30, 202656% over the limit
Chloride [as Cl]0346January 31, 20153% over the limit
Nitrogen, ammonia total [as N]12464October 31, 2005395% over the limit
BOD, 5-day, 20 deg. C145682January 31, 201510% over the limit
Solids, total suspended14602July 31, 202332% over the limit
Flow, in conduit or thru treatment plant6400
pH4280
Mercury, total recoverable4220
Coliform, fecal general4180
Phosphorus, total [as P]5140
Nickel, total recoverable4120
Zinc, total recoverable4120
Cadmium, total recoverable4120
Lead, total recoverable4120
Chromium, total recoverable4120
Copper, total recoverable4120

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
August 20, 2025WW SSO - Discharge to WatersST6
August 13, 2025WW SSO - Discharge to WatersST6
August 12, 2025WW SSO - Discharge to WatersST6
August 11, 2025WW SSO - Discharge to WatersST6
June 3, 2025WW SSO - Discharge to WatersST6
February 26, 2025WW SSO - Discharge to WatersST6
October 5, 2024WW SSO - Discharge to WatersST6
September 4, 2024WW SSO - Discharge to WatersST6
April 26, 2024WW SSO - Discharge to WatersST6
April 13, 2024WW SSO - Discharge to WatersST6
March 7, 2024WW SSO - Discharge to WatersST6
October 6, 2023WW SSO - Discharge to WatersST6
October 5, 2023WW SSO - Discharge to WatersST6
September 18, 2023WW SSO - Discharge to WatersST6
September 17, 2023WW SSO - Discharge to WatersST6
September 8, 2023WW SSO - Discharge to WatersST6
May 23, 2023WW SSO - Discharge to WatersST6
May 12, 2023WW SSO - Discharge to WatersST6
March 14, 2023WW SSO - Discharge to WatersST6
September 9, 2022WW SSO - Discharge to WatersST6
August 30, 2022WW SSO - Discharge to WatersST6
June 4, 2020Permit Violations - Violation Specified in CommentST6
April 22, 2019WW SSO - Discharge to WatersST6
March 24, 2019WW SSO - Discharge to WatersST6
March 22, 2019WW SSO - Discharge to WatersST6
February 8, 2019WW SSO - Discharge to WatersST6
June 16, 2018WW SSO - Discharge to WatersST6
September 5, 2017WW SSO - Discharge to WatersST6
July 10, 2017WW SSO - Discharge to WatersST6
February 21, 2017WW SSO - Discharge to WatersST6

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 WI0024597 for the MADISON METRO SEW DIST WWTF in Madison, WI, administratively continued and classed as a Major Discharger. The register lists 5 pollutants under a numeric limit and 5 pollutants with an effluent exceedance, with the permit's status and dates as they stood when loaded on September 15, 2026.