Clean Water Act discharge permit · NPDES IL0001554
DYNEGY MIDWEST GENERATION LLC, Hennepin, IL: NPDES IL0001554 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 9Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
DYNEGY MIDWEST GENERATION LLC, held by DYNEGY MIDWEST GENERATION INC, holds NPDES permit IL0001554, which discharges to Illinois River. EPA’s file records it issued May 24, 2011 and expiring April 30, 2016. 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 | DYNEGY MIDWEST GENERATION LLC |
|---|---|
| Permittee as filed | DYNEGY MIDWEST GENERATION INC |
| NPDES ID | IL0001554 |
| 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 | May 24, 2011 |
| Expiration date | April 30, 2016 |
| Address | Hennepin, IL 61327 |
| Receiving water | ILLINOIS RIVER |
| Subwatershed | Depue Lake-Illinois River (HUC 071300010804) |
| SIC | 4911 – Electric Services |
| Other EPA IDs (FRS) | RCRA handler ILD060867983; ICIS-AIR source IL000155010AAA |
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
- 9Pollutants on file
- 9Under a numeric limit
- 4With 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 |
|---|---|---|---|---|---|
| Chlorine, total residual | 2 | 3 | 1 | August 31, 2013 | 40% over the limit |
| pH | 6 | 1 | 1 | January 31, 2013 | |
| Flow, in conduit or thru treatment plant | 12 | 4 | 0 | ||
| Mercury, total [as Hg] | 4 | 2 | 0 | ||
| Solids, total suspended | 6 | 0 | 0 | ||
| Oil and grease | 4 | 0 | 0 | ||
| Oil & Grease | 2 | 0 | 0 | ||
| Iron, total [as Fe] | 2 | 0 | 0 | ||
| Temperature, water deg. fahrenheit | 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 IL0001554.
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
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, IL0001554.
Start the watch
- One permit holder — $99/month
- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
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 IL0001554 there.
Nearby on the register
- Discharge permits in Hennepin
- Every permit record in Hennepin, A to Z
- Discharge permits in Illinois
- Every permit record in Illinois, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.