Clean Water Act discharge permit · NPDES WI0036820
MILWAUKEE METRO SEW DIST COMBI, Milwaukee, WI: NPDES WI0036820 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 18Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
MILWAUKEE METRO SEW DIST COMBI holds NPDES permit WI0036820, which discharges to Lake Michigan & Milwaukee Outer Harbor. EPA’s file records it issued January 1, 2013 and expiring December 31, 2017. 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 filed | MILWAUKEE METRO SEW DIST COMBI |
|---|---|
| Permittee as filed | MILWAUKEE METRO SEW DIST COMBI |
| NPDES ID | WI0036820 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | January 1, 2013 |
| Expiration date | December 31, 2017 |
| Address | Milwaukee, WI 53207 |
| Receiving water | LAKE MICHIGAN & MILWAUKEE OUTER HARBOR |
| Subwatershed | Wind Point-Frontal Lake Michigan (HUC 040400020101) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 19Pollutants on file
- 18Under a numeric limit
- 18With a violation of any kind
- 4With an effluent exceedance
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 measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Coliform, fecal general | 2 | 30 | 16 | September 30, 2016 | 99,999% over the limit |
| Solids, total suspended | 10 | 85 | 2 | August 31, 2025 | 85% over the limit |
| Mercury, total recoverable | 4 | 40 | 2 | March 31, 2023 | 150% over the limit |
| Chlorine, total residual | 8 | 71 | 1 | February 28, 2018 | 163% over the limit |
| Phosphorus, total [as P] | 14 | 445 | 0 | ||
| Nitrogen, ammonia total [as N] | 12 | 349 | 0 | ||
| Temperature, water deg. fahrenheit | 7 | 325 | 0 | ||
| Flow, in conduit or thru treatment plant | 10 | 112 | 0 | ||
| BOD, 5-day, 20 deg. C | 12 | 83 | 0 | ||
| Nickel, total recoverable | 4 | 38 | 0 | ||
| Zinc, total recoverable | 4 | 38 | 0 | ||
| Cadmium, total recoverable | 4 | 38 | 0 | ||
| Lead, total recoverable | 4 | 38 | 0 | ||
| Chromium, total recoverable | 4 | 38 | 0 | ||
| Copper, total recoverable | 4 | 38 | 0 | ||
| pH | 4 | 28 | 0 | ||
| E. coli | 4 | 28 | 0 | ||
| Arsenic, total recoverable | 0 | 16 | 0 | ||
| Oil and grease, hexane extr method | 2 | 0 | 0 |
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
- 21Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| September 18, 2025 | WW SSO - Discharge to Waters | ST6 |
| September 11, 2025 | Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II) | EP6 |
| August 10, 2025 | WW SSO - Discharge to Waters | ST6 |
| August 9, 2025 | WW SSO - Discharge to Waters | ST6 |
| April 4, 2025 | WW SSO - Discharge to Waters | ST6 |
| March 11, 2025 | WW SSO - Discharge to Waters | ST6 |
| July 14, 2024 | Permit Violations - Violation Specified in Comment | ST6 |
| April 2, 2024 | WW SSO - Discharge to Waters | ST6 |
| March 26, 2024 | WW SSO - Discharge to Waters | ST6 |
| September 12, 2022 | WW SSO - Discharge to Waters | ST6 |
| May 17, 2022 | Monitoring Violations - Analysis not Conducted | ST6 |
| October 7, 2021 | WW SSO - Discharge to Waters | ST6 |
| September 13, 2021 | WW SSO - Discharge to Waters | ST6 |
| August 8, 2021 | WW SSO - Discharge to Waters | ST6 |
| August 2, 2020 | WW SSO - Discharge to Waters | ST6 |
| May 17, 2020 | WW SSO - Discharge to Waters | ST6 |
| July 13, 2017 | Permit Violations - Unapproved Operation | ST6 |
| July 12, 2017 | WW SSO - Discharge to Waters | ST6 |
| April 26, 2017 | Biosolids: Other Management Practice Violation | EP6 |
| April 26, 2017 | Monitoring Violations - Invalid/Unrepresentative Sample | EP6 |
| February 8, 2017 | Permit Violations - Unapproved Operation | 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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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.