SOUTHERN ILLINOIS POWER COOPERATIVE

NPDES permit IL0004316 · Major NON-POTW · effective, expires 2027-06-30 · 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.

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

0values over a limit
0required values missing, on 0 form(s)
0of 48 forms filed late

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

Reporting

Reports are due about 25 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (32)

OutfallParameterStatisticLimitMonths
002Sulfate [as S]DAILY MX <= 1494 mg/L all year
002pHMO MIN >= 6.5 SU all year
002pHMO MAX <= 9 SU all year
002Solids, total suspended30DA AVG <= 15 mg/L all year
002Solids, total suspendedDAILY MX <= 30 mg/L all year
002Chloride [as Cl]DAILY MX <= 500 mg/L all year
002Fluoride, total [as F]DAILY MX <= 1.4 mg/L all year
002Boron, total [as B]DAILY MX <= 9 mg/L all year
002Copper, total [as Cu]30DA AVG <= .023 mg/L all year
002Copper, total [as Cu]DAILY MX <= .037 mg/L all year
002Iron, total [as Fe]30DA AVG <= 2 mg/L all year
002Iron, total [as Fe]DAILY MX <= 4 mg/L all year
002Nickel, total [as Ni]30DA AVG <= .087 mg/L all year
002Zinc, total [as Zn]30DA AVG <= .0553 mg/L all year
002Zinc, total [as Zn]DAILY MX <= .2133 mg/L all year
002Oil and grease30DA AVG <= 15 mg/L all year
002Oil and greaseDAILY MX <= 20 mg/L 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
002Mercury, total [as Hg]ANNL AVG <= 12 ng/L all year
003Temperature, water deg. fahrenheitMO MAX <= 73 deg F Jan, Feb, Mar, Dec
003Temperature, water deg. fahrenheitMO MAX <= 93 deg F Apr, May
003Temperature, water deg. fahrenheitMO MAX <= 103 deg F Jun, Jul, Aug, Sep
003Temperature, water deg. fahrenheitMO MAX <= 94 deg F Oct, Nov
003Temperature, length of excursionTOTAL <= 87.6 hr/12mo all year
003Flow, in conduit or thru treatment plantMO AVG report only all year
003Flow, in conduit or thru treatment plantDAILY MX report only all year
003Chlorine, total residualWKLY MAX <= .2 mg/L 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
006Flow, in conduit or thru treatment plantMO AVG report only all year
006Flow, 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