Clean Water Act discharge permit · NPDES IL0048151
CONSTELLATION GENERATION COMPANY LLC, Marseilles, IL: NPDES IL0048151 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 11Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
CONSTELLATION GENERATION COMPANY LLC, held by EXELON GENERATION CO LLC, holds NPDES permit IL0048151, which discharges to Illinois River. EPA’s file records it issued July 5, 2013 and expiring July 31, 2018. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | CONSTELLATION GENERATION COMPANY LLC |
|---|---|
| Permittee as filed | EXELON GENERATION CO LLC |
| NPDES ID | IL0048151 |
| 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 | July 5, 2013 |
| Expiration date | July 31, 2018 |
| Address | Marseilles, IL 61341 |
| Receiving water | ILLINOIS RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | South Kickapoo Creek-Illinois River (HUC 071200050802) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 11Pollutants on file
- 11Under a numeric limit
- 8With 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 |
|---|---|---|---|---|---|
| Temperature, water deg. fahrenheit | 2 | 6 | 6 | September 30, 2014 | 3% over the limit |
| pH | 6 | 7 | 3 | March 31, 2009 | |
| Solids, total suspended | 14 | 18 | 0 | ||
| Flow, in conduit or thru treatment plant | 12 | 8 | 0 | ||
| BOD, carbonaceous [5 day, 20 C] | 4 | 8 | 0 | ||
| Oil and grease | 6 | 4 | 0 | ||
| Zinc, total [as Zn] | 2 | 2 | 0 | ||
| Oxidants, total residual | 1 | 2 | 0 | ||
| Chlorine, total residual | 2 | 0 | 0 | ||
| Chlorination duration | 1 | 0 | 0 | ||
| Chlorine usage | 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 IL0048151.
Velarion’s copy of EPA’s ICIS-NPDES files does not yet 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, IL0048151.
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 IL0048151 there.
Nearby on the register
- Discharge permits in Marseilles
- Every permit record in Marseilles, A to Z
- Discharge permits in Illinois
- Every permit record in Illinois, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.