Clean Water Act discharge permit · NPDES IL0000108

COFFEEN POWER STATION, Coffeen, IL: NPDES IL0000108 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
18Pollutants under a numeric limit
9Pollutants with an effluent exceedance

COFFEEN POWER STATION, held by ILLINOIS POWER GENERATING COMPANY, holds NPDES permit IL0000108, which discharges to Coffeen Lake. EPA’s file records it issued January 29, 2008 and expiring January 31, 2013. 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	COFFEEN POWER STATION
Permittee as filed	ILLINOIS POWER GENERATING COMPANY
NPDES ID	IL0000108
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	January 29, 2008
Expiration date	January 31, 2013
Address	Coffeen, IL 62017
Receiving water	COFFEEN LAKE
Receiving water impaired	303(D) Listed
Subwatershed	Coffeen Lake (HUC 071402030304)
SIC	4911 – Electric Services
Other EPA IDs (FRS)	RCRA handler ILD000667212; ICIS-AIR source IL000135803AAA

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

19Pollutants on file
18Under a numeric limit
19With a violation of any kind
9With 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	19	75	26	February 28, 2025	480% over the limit
Solids, total dissolved	1	19	19	May 31, 2018	25,456% over the limit
Temperature, water deg. fahrenheit	54	12	3	October 31, 2017	0% over the limit
Chlorine, total residual	10	9	3	September 30, 2012	205% over the limit
pH	28	42	2	June 30, 2024
Oil and grease	12	36	2	April 30, 2020	87% over the limit
BOD, 5-day, 20 deg. C	4	14	2	May 31, 2008	117% over the limit
Iron, total [as Fe]	3	5	2	June 30, 2013	1,320% over the limit
Boron, total [as B]	1	2	2	August 31, 2006	33% over the limit
Flow, in conduit or thru treatment plant	41	70	0
Mercury, total [as Hg]	26	31	0
Chloride [as Cl]	12	19	0
Sulfate, total [as SO4]	3	15	0
Boron, dissolved [as B]	3	15	0
Manganese, total [as Mn]	11	5	0
Copper, total [as Cu]	1	3	0
Zinc, total [as Zn]	1	1	0
Solids, total dissolved- 180 deg. C	1	1	0
Coliform, fecal general	0	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 IL0000108.

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.

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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 IL0000108 there.

Nearby on the register

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

This public-records page covers Clean Water Act discharge permit NPDES IL0000108 for Coffeen Power Station in Coffeen, IL, held by Illinois Power Generating Company, which discharges to Coffeen Lake and is classed as a Major Discharger. The page lists 18 pollutants under a numeric limit and 9 pollutants with an effluent exceedance, and it records the permit as issued January 29, 2008 with an expiration date of January 31, 2013 and an administratively continued status.