Clean Water Act discharge permit · NPDES IL0002763

ZION STATION, Zion, IL: NPDES IL0002763 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
6Pollutants under a numeric limit
2Pollutants with an effluent exceedance

ZION STATION, held by EXELON GENERATION COMPANY, LLC, holds NPDES permit IL0002763, which discharges to Lake Michigan. EPA’s file records it issued December 29, 2006 and expiring February 29, 2012. 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	ZION STATION
Permittee as filed	EXELON GENERATION COMPANY, LLC
NPDES ID	IL0002763
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	December 29, 2006
Expiration date	February 29, 2012
Address	Zion, IL 60099
Receiving water	LAKE MICHIGAN
Receiving water impaired	303(D) Listed
Subwatershed	Waukegan River-Frontal Lake Michigan (HUC 040400020501)
SIC	4911 – Electric Services
Other EPA IDs (FRS)	RCRA handler ILD010217156

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

7Pollutants on file
6Under a numeric limit
6With 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	14	10	2	January 31, 2012	9% over the limit
Oil and grease	12	3	1	April 30, 2006	3% over the limit
Flow, in conduit or thru treatment plant	16	11	0
Copper, total [as Cu]	2	9	0
pH	8	6	0
Oil & Grease	0	2	0
Polychlorinated biphenyls [PCBs]	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

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES IL0002763.

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 IL0002763 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

This EPA NPDES permit page covers ZION STATION in Zion, IL, held by EXELON GENERATION COMPANY, LLC, which discharges to LAKE MICHIGAN under permit IL0002763, listed as administratively continued and a Major Discharger class facility. The page reports 2 pollutants under a numeric limit and 2 pollutants with an effluent exceedance, with the permit issued December 29, 2006 and expiring February 29, 2012.