MIDWEST GENERATION LLC

NPDES permit IL0002232 · Major NON-POTW · administratively continued, expires 2026-08-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

This permit expired on 2026-08-31 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

EPA's record, 2025-09-01 to 2026-08-31

0values over a limit
0required values missing, on 0 form(s)
0of 84 forms filed late

Last period with anything received: 2026-08-31.

Reporting

Reports are due about 25 days after each monitoring period ends (the most common figure among IL permits in EPA's filings — check your permit).

Limits in force (50)

OutfallParameterStatisticLimitMonths
001pHMO MIN >= 6 SU all year
001pHMO MAX <= 9 SU all year
001Solids, total suspended30DA AVG <= 15 mg/L all year
001Solids, total suspendedDAILY MX <= 30 mg/L all year
001Oil and grease30DA AVG <= 15 mg/L all year
001Oil and greaseDAILY MX <= 20 mg/L all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
002Temperature, water deg. fahrenheitMO MAX report only all year
002pHMO MIN >= 6.5 SU all year
002pHMO MAX <= 9 SU all year
002Flow, in conduit or thru treatment plantMO AVG report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
004BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L all year
004BOD, 5-day, 20 deg. CDAILY MX <= 60 mg/L all year
004BOD, 5-day, 20 deg. C30DA AVG <= 10 lb/d all year
004BOD, 5-day, 20 deg. CDAILY MX <= 20 lb/d all year
004pHMO MIN >= 6 SU all year
004pHMO MAX <= 9 SU all year
004Solids, total suspended30DA AVG <= 30 mg/L all year
004Solids, total suspendedDAILY MX <= 60 mg/L all year
004Solids, total suspended30DA AVG <= 10 lb/d all year
004Solids, total suspendedDAILY MX <= 20 lb/d all year
004Flow, in conduit or thru treatment plantMO AVG report only all year
004Flow, in conduit or thru treatment plantDAILY MX report only all year
004Chlorine, total residualDAILY MX <= .05 mg/L all year
A01Solids, total suspended30DA AVG <= 30 mg/L all year
A01Solids, total suspendedDAILY MX <= 100 mg/L all year
A01Copper, total [as Cu]30DA AVG <= .5 mg/L all year
A01Copper, total [as Cu]DAILY MX <= 1 mg/L all year
A01Iron, total [as Fe]30DA AVG <= 1 mg/L all year
A01Iron, total [as Fe]DAILY MX <= 1 mg/L all year
A01Oil and grease30DA AVG <= 15 mg/L all year
A01Oil and greaseDAILY MX <= 20 mg/L all year
A01Flow, in conduit or thru treatment plantMO AVG report only all year
A01Flow, in conduit or thru treatment plantDAILY MX report only all year
A02Solids, total suspended30DA AVG <= 15 mg/L all year
A02Solids, total suspendedDAILY MX <= 30 mg/L all year
A02Oil and grease30DA AVG <= 15 mg/L all year
A02Oil and greaseDAILY MX <= 20 mg/L all year
A02Flow, in conduit or thru treatment plantMO AVG report only all year
A02Flow, in conduit or thru treatment plantDAILY MX report only all year
B02Solids, total suspended30DA AVG <= 15 mg/L all year
B02Solids, total suspendedDAILY MX <= 30 mg/L all year
B02Oil and grease30DA AVG <= 15 mg/L all year
B02Oil and greaseDAILY MX <= 20 mg/L all year
B02Flow, in conduit or thru treatment plantMO AVG report only all year
B02Flow, in conduit or thru treatment plantDAILY MX report only all year
INTFlow, in conduit or thru treatment plantMO AVG report only all year
INTFlow, in conduit or thru treatment plantDAILY MX report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states