EXELON GENERATION COMPANY LLC

NPDES permit IL0048321 · 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 81 forms filed late

Last period with anything received: 2026-07-31.

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 (76)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheitMO MAX <= 63 deg F Jan, Feb, Mar, Dec
001Temperature, water deg. fahrenheitMO MAX <= 93 deg F Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
001pHMO MIN >= 6 SU all year
001pHMO MAX <= 9 SU all year
001Oxidants, total residualMO AVG report only all year
001Oxidants, total residualDAILY MX <= .05 mg/L all year
001Temperature, length of excursionANNL TOT <= 87.6 hr/12mo 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
001Chlorine, total residualDAILY MX <= .2 mg/L all year
001Temperature Increase Deg. FMO MAX <= 5 deg F all year
001Chlorination durationDAILY MX report only all year
001Chlorine usageMO AVG report only all year
001Chlorine usageDAILY MX report only all year
002Oil & Grease30DA AVG <= 15 mg/L all year
002Oil & Grease30DA AVG <= 15 mg/L all year
002Oil & GreaseDAILY MX <= 30 mg/L all year
002Oil & GreaseDAILY MX <= 30 mg/L all year
002Flow, in conduit or thru treatment plantMO AVG report only 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
002Flow, in conduit or thru treatment plantDAILY MX report only all year
005Temperature, water deg. fahrenheitMO MAX <= 63 deg F Jan, Feb, Mar, Dec
005Temperature, water deg. fahrenheitMO MAX <= 93 deg F Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
005Temperature, water deg. fahrenheitMO MAX report only all year
005pHMO MIN >= 6 SU all year
005pHMO MAX <= 9 SU all year
005Oxidants, total residualMO AVG report only all year
005Oxidants, total residualDAILY MX <= .05 mg/L all year
005Temperature, length of excursionANNL TOT <= 87.6 hr/12mo all year
005Flow, in conduit or thru treatment plantMO AVG report only all year
005Flow, in conduit or thru treatment plantDAILY MX report only all year
005Chlorine, total residualDAILY MX <= .2 mg/L all year
005Chlorination durationDAILY MX report only all year
005Chlorine usageMO AVG report only all year
005Chlorine usageDAILY MX report only all year
006Temperature, water deg. fahrenheitMO MAX <= 63 deg F Jan, Feb, Mar, Dec
006Temperature, water deg. fahrenheitMO MAX <= 93 deg F Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
006Temperature, water deg. fahrenheitMO MAX report only all year
006pHMO MIN >= 6 SU all year
006pHMO MAX <= 9 SU all year
006Oxidants, total residualMO AVG report only all year
006Oxidants, total residualDAILY MX <= .05 mg/L all year
006Temperature, length of excursionANNL TOT <= 87.6 hr/12mo all year
006Flow, in conduit or thru treatment plantMO AVG report only all year
006Flow, in conduit or thru treatment plantDAILY MX report only all year
006Chlorine, total residualDAILY MX <= .2 mg/L all year
006Chlorination durationDAILY MX report only all year
006Chlorine usageMO AVG report only all year
006Chlorine usageDAILY MX report only all year
A01Solids, total suspended30DA AVG <= 15 mg/L all year
A01Solids, total suspendedDAILY MX <= 30 mg/L all year
A01Oil & Grease30DA AVG <= 15 mg/L all year
A01Oil & 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
C01Solids, total suspended30DA AVG <= 15 mg/L all year
C01Solids, total suspendedDAILY MX <= 30 mg/L all year
C01Oil & Grease30DA AVG <= 15 mg/L Jan, Jul
C01Oil & GreaseDAILY MX <= 20 mg/L Jan, Jul
C01Flow, in conduit or thru treatment plantMO AVG report only all year
C01Flow, in conduit or thru treatment plantDAILY MX report only all year
D01Solids, total suspended30DA AVG <= 15 mg/L all year
D01Solids, total suspendedDAILY MX <= 30 mg/L all year
D01Flow, in conduit or thru treatment plantMO AVG report only all year
D01Flow, in conduit or thru treatment plantDAILY MX report only all year
F01Solids, total suspended30DA AVG <= 15 mg/L all year
F01Solids, total suspendedDAILY MX <= 30 mg/L all year
F01Oil & Grease30DA AVG <= 15 mg/L all year
F01Oil & GreaseDAILY MX <= 20 mg/L all year
F01Copper, total [as Cu]30DA AVG report only all year
F01Copper, total [as Cu]DAILY MX report only all year
F01Iron, total [as Fe]30DA AVG <= 1 mg/L all year
F01Iron, total [as Fe]DAILY MX <= 1 mg/L all year
F01Flow, in conduit or thru treatment plantMO AVG report only all year
F01Flow, 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