Clean Water Act discharge permit · NPDES IL0064254
MIDWEST GENERATION, LLC, Joliet, IL: NPDES IL0064254 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 27Pollutants under a numeric limit
- 3Pollutants with an effluent exceedance
MIDWEST GENERATION, LLC holds NPDES permit IL0064254, which discharges to Des Plaines River. EPA’s file records it issued September 30, 2014 and expiring October 31, 2019. 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 filed | MIDWEST GENERATION, LLC |
|---|---|
| Permittee as filed | MIDWEST GENERATION, LLC |
| NPDES ID | IL0064254 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | September 30, 2014 |
| Expiration date | October 31, 2019 |
| Address | Joliet, IL 60436 |
| Receiving water | DES PLAINES RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Des Plaines River (HUC 071200040905) |
| SIC | 4911 – Electric Services |
| Other EPA IDs (FRS) | RCRA handler ILD980999387; ICIS-AIR source IL000197809AAO |
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
- 31Pollutants on file
- 27Under a numeric limit
- 11With a violation of any kind
- 3With 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 |
|---|---|---|---|---|---|
| Solids, total suspended | 14 | 25 | 7 | March 31, 2015 | 18,533% over the limit |
| Iron, total [as Fe] | 6 | 5 | 2 | March 31, 2015 | 70% over the limit |
| Oil & Grease | 14 | 9 | 1 | April 30, 2008 | 165% over the limit |
| Flow, in conduit or thru treatment plant | 16 | 16 | 0 | ||
| pH | 6 | 10 | 0 | ||
| BOD, 5-day, 20 deg. C | 2 | 8 | 0 | ||
| Copper, total [as Cu] | 4 | 6 | 0 | ||
| Temperature, length of excursion | 0 | 3 | 0 | ||
| Chlorination frequency | 0 | 1 | 0 | ||
| Chlorination duration | 0 | 1 | 0 | ||
| Chlorine usage | 0 | 1 | 0 | ||
| Temperature, water deg. fahrenheit | 8 | 0 | 0 | ||
| Mercury, total [as Hg] | 7 | 0 | 0 | ||
| Cyanide, weak acid, dissociable | 2 | 0 | 0 | ||
| Cyanide, total [as CN] | 2 | 0 | 0 | ||
| Fluoride, total [as F] | 2 | 0 | 0 | ||
| Arsenic, total [as As] | 2 | 0 | 0 | ||
| Barium, total [as Ba] | 2 | 0 | 0 | ||
| Cadmium, total [as Cd] | 2 | 0 | 0 | ||
| Chromium, hexavalent [as Cr] | 2 | 0 | 0 | ||
| Chromium, total [as Cr] | 2 | 0 | 0 | ||
| Iron, dissolved [as Fe] | 2 | 0 | 0 | ||
| Lead, total [as Pb] | 2 | 0 | 0 | ||
| Manganese, total [as Mn] | 2 | 0 | 0 | ||
| Nickel, total [as Ni] | 2 | 0 | 0 | ||
| Silver, total [as Ag] | 2 | 0 | 0 | ||
| Zinc, total [as Zn] | 2 | 0 | 0 | ||
| Selenium, total [as Se] | 2 | 0 | 0 | ||
| Phenolics, total recoverable | 2 | 0 | 0 | ||
| Month excursion time [min] | 2 | 0 | 0 | ||
| Chlorine, total residual | 1 | 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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES IL0064254.
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.
Watch this permit
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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 IL0064254 there.
Nearby on the register
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- Every permit record in Illinois, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.