Clean Water Act discharge permit · NPDES IL0004057
DYNEGY MIDWEST GENERATION LLC, Oakwood, IL: NPDES IL0004057 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 33Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
DYNEGY MIDWEST GENERATION LLC, held by DYNEGY MIDWEST GEN-VERMILION, holds NPDES permit IL0004057, which discharges to Middle Fork Vermilion River. EPA’s file records it issued March 7, 2003 and expiring February 29, 2008. 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 | DYNEGY MIDWEST GENERATION LLC |
|---|---|
| Permittee as filed | DYNEGY MIDWEST GEN-VERMILION |
| NPDES ID | IL0004057 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | March 7, 2003 |
| Expiration date | February 29, 2008 |
| Address | Oakwood, IL 61858 |
| Receiving water | MIDDLE FORK VERMILION RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Middle Fork Vermillion River (HUC 051201090509) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 33Pollutants on file
- 33Under a numeric limit
- 33With a violation of any kind
- 2With 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 | 6 | 13 | 9 | April 30, 2026 | 61% over the limit |
| Oil and grease | 10 | 9 | 1 | March 31, 2023 | 5% over the limit |
| Flow, in conduit or thru treatment plant | 10 | 6 | 0 | ||
| Iron, total [as Fe] | 6 | 6 | 0 | ||
| Sulfate, total [as SO4] | 6 | 5 | 0 | ||
| Boron, total [as B] | 6 | 5 | 0 | ||
| Solids, total dissolved- 180 deg. C | 6 | 5 | 0 | ||
| pH | 6 | 4 | 0 | ||
| Benzene, ethylbenzene, toluene, xylene combination | 4 | 4 | 0 | ||
| Toluene | 4 | 4 | 0 | ||
| Benzene | 4 | 4 | 0 | ||
| Ethylbenzene | 4 | 4 | 0 | ||
| Xylene [mix of m+o+p] | 4 | 4 | 0 | ||
| Copper, total [as Cu] | 2 | 2 | 0 | ||
| Acenaphthylene | 2 | 2 | 0 | ||
| Acenaphthene | 2 | 2 | 0 | ||
| Anthracene | 2 | 2 | 0 | ||
| Benzo[k]fluoranthene | 2 | 2 | 0 | ||
| Benzo[a]pyrene | 2 | 2 | 0 | ||
| Chrysene | 2 | 2 | 0 | ||
| Fluoranthene | 2 | 2 | 0 | ||
| Fluorene | 2 | 2 | 0 | ||
| Indeno[1,2,3-cd]pyrene | 2 | 2 | 0 | ||
| Phenanthrene | 2 | 2 | 0 | ||
| Pyrene | 2 | 2 | 0 | ||
| Benzo[ghi]perylene | 2 | 2 | 0 | ||
| Benzo[a]anthracene | 2 | 2 | 0 | ||
| Dibenz[a,h]anthracene | 2 | 2 | 0 | ||
| Naphthalene | 2 | 2 | 0 | ||
| Polyram | 2 | 2 | 0 | ||
| 3,4-Benzofluoranthene | 2 | 2 | 0 | ||
| Flow, total | 2 | 2 | 0 | ||
| Zinc, total [as Zn] | 2 | 1 | 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 IL0004057.
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 IL0004057 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.