US STEEL CORP, MIDWEST PLANT

NPDES permit IN0000337 · Major NON-POTW · effective, expires 2026-09-30 · 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)
8of 96 forms filed late

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

Reporting

Reports are due about 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (273)

OutfallParameterStatisticLimitMonths
002Temperature, water deg. fahrenheitMO AVG report only all year
002Temperature, water deg. fahrenheitDAILY MX report only all year
002pHDAILY MN >= 6 SU all year
002pHDAILY MX <= 9 SU all year
002Solids, total suspendedDAILY MX report only Mar, Jun, Sep, Dec
002Oil and grease, hexane extr methodDAILY MX report only all year
002Nitrogen, ammonia total [as N]DAILY MX report only Mar, Jun, Sep, Dec
002Zinc, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
002Flow, in conduit or thru treatment plantMO AVG report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
002Chlorine, total residualMO AVG <= .01 mg/L all year
002Chlorine, total residualDAILY MX < .06 mg/L all year
002Chlorine, total residualMO AVG <= .04 lb/d all year
002Chlorine, total residualDAILY MX < .16 lb/d all year
002Chemical Oxygen Demand [COD]DAILY MX report only Mar, Jun, Sep, Dec
002Flow, totalMO TOTAL report only all year
003Temperature, water deg. fahrenheitMO AVG report only all year
003Temperature, water deg. fahrenheitDAILY MX report only all year
003pHDAILY MN >= 6 SU all year
003pHDAILY MX <= 9 SU all year
003Solids, total suspendedDAILY MX report only Mar, Jun, Sep, Dec
003Oil and grease, hexane extr methodDAILY MX report only all year
003Nitrogen, ammonia total [as N]DAILY MX report only Mar, Jun, Sep, Dec
003Zinc, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
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 residualMO AVG <= .01 mg/L all year
003Chlorine, total residualDAILY MX < .06 mg/L all year
003Chlorine, total residualMO AVG <= 1.3 lb/d all year
003Chlorine, total residualDAILY MX < 7.6 lb/d all year
003Chemical Oxygen Demand [COD]DAILY MX report only Mar, Jun, Sep, Dec
003Flow, totalMO TOTAL report only all year
004Temperature, water deg. fahrenheitMO AVG report only all year
004Temperature, water deg. fahrenheitDAILY MX report only all year
004pHDAILY MN >= 6 SU all year
004pHDAILY MX <= 9 SU all year
004Oil and grease, hexane extr methodDAILY MX report only all year
004Cyanide, free [as free]MO AVG <= .0075 mg/L all year
004Cyanide, free [as free]DAILY MX <= .013 mg/L all year
004Cyanide, free [as free]MO AVG <= 1.2 lb/d all year
004Cyanide, free [as free]DAILY MX <= 2.1 lb/d all year
004Nickel, total recoverableMO AVG <= .21 mg/L all year
004Nickel, total recoverableDAILY MX <= .36 mg/L all year
004Nickel, total recoverableMO AVG <= 31 lb/d all year
004Nickel, total recoverableDAILY MX <= 54 lb/d all year
004Silver total recoverableMO AVG <= .076 ug/L all year
004Silver total recoverableDAILY MX <= .13 ug/L all year
004Silver total recoverableMO AVG <= .012 lb/d all year
004Silver total recoverableDAILY MX < .021 lb/d all year
004Cadmium, total recoverableMO AVG <= .0077 mg/L all year
004Cadmium, total recoverableDAILY MX <= .013 mg/L all year
004Cadmium, total recoverableMO AVG <= 1.2 lb/d all year
004Cadmium, total recoverableDAILY MX <= 2.1 lb/d all year
004Lead, total recoverableMO AVG <= .038 mg/L all year
004Lead, total recoverableDAILY MX <= .066 mg/L all year
004Lead, total recoverableMO AVG <= 5.8 lb/d all year
004Lead, total recoverableDAILY MX <= 9.9 lb/d all year
004Copper, total recoverableMO AVG <= .03 mg/L all year
004Copper, total recoverableDAILY MX <= .052 mg/L all year
004Copper, total recoverableMO AVG <= 4.7 lb/d all year
004Copper, total recoverableDAILY MX <= 8.2 lb/d all year
004Chromium, hexavalent dissolved [as Cr]MO AVG report only all year
004Chromium, hexavalent dissolved [as Cr]DAILY MX report only all year
004Chromium, hexavalent dissolved [as Cr]MO AVG report only all year
004Chromium, hexavalent dissolved [as Cr]DAILY MX report only 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 residualMO AVG <= .01 mg/L all year
004Chlorine, total residualDAILY MX < .06 mg/L all year
004Chlorine, total residualMO AVG <= 1.4 lb/d all year
004Chlorine, total residualDAILY MX < 8.5 lb/d all year
004FormaldehydeMO AVG report only all year
004FormaldehydeDAILY MX report only all year
004FormaldehydeMO AVG report only all year
004FormaldehydeDAILY MX report only all year
004Mercury, total recoverableANNL AVG <= 18 ng/L Feb, Apr, Jun, Aug, Oct, Dec
004Mercury, total recoverableDAILY MX report only Feb, Apr, Jun, Aug, Oct, Dec
004Mercury, total recoverableDAILY MX report only Feb, Apr, Jun, Aug, Oct, Dec
004Flow, totalMO TOTAL report only all year
104Solids, total suspendedMO AVG report only all year
104Solids, total suspendedDAILY MX report only all year
104Solids, total suspendedMO AVG report only all year
104Solids, total suspendedDAILY MX report only all year
104Oil and grease, hexane extr methodMO AVG report only all year
104Oil and grease, hexane extr methodDAILY MX report only all year
104Oil and grease, hexane extr methodDAILY MX report only all year
104Cyanide, total [as CN]MO AVG report only all year
104Cyanide, total [as CN]DAILY MX report only all year
104Cyanide, total [as CN]MO AVG report only all year
104Cyanide, total [as CN]DAILY MX report only all year
104Fluoride, total [as F]MO AVG report only all year
104Fluoride, total [as F]DAILY MX report only all year
104Fluoride, total [as F]MO AVG report only all year
104Fluoride, total [as F]DAILY MX report only all year
104Nickel, total recoverableMO AVG report only all year
104Nickel, total recoverableDAILY MX report only all year
104Nickel, total recoverableMO AVG report only all year
104Nickel, total recoverableDAILY MX report only all year
104Silver total recoverableMO AVG report only all year
104Silver total recoverableDAILY MX report only all year
104Silver total recoverableMO AVG report only all year
104Silver total recoverableDAILY MX report only all year
104Zinc, total recoverableMO AVG report only all year
104Zinc, total recoverableDAILY MX report only all year
104Zinc, total recoverableMO AVG report only all year
104Zinc, total recoverableDAILY MX report only all year
104Cadmium, total recoverableMO AVG report only all year
104Cadmium, total recoverableDAILY MX report only all year
104Cadmium, total recoverableMO AVG report only all year
104Cadmium, total recoverableDAILY MX report only all year
104Lead, total recoverableMO AVG report only all year
104Lead, total recoverableDAILY MX report only all year
104Lead, total recoverableMO AVG report only all year
104Lead, total recoverableDAILY MX report only all year
104Chromium, total recoverableMO AVG report only all year
104Chromium, total recoverableDAILY MX report only all year
104Chromium, total recoverableDAILY AV report only all year
104Chromium, total recoverableDAILY MX report only all year
104Copper, total recoverableMO AVG report only all year
104Copper, total recoverableDAILY MX report only all year
104Copper, total recoverableMO AVG report only all year
104Copper, total recoverableDAILY MX report only all year
104Chromium, hexavalent dissolved [as Cr]MO AVG report only all year
104Chromium, hexavalent dissolved [as Cr]DAILY MX report only all year
104Chromium, hexavalent dissolved [as Cr]DAILY AV report only all year
104Chromium, hexavalent dissolved [as Cr]DAILY MX report only all year
104TetrachloroethyleneMO AVG report only all year
104TetrachloroethyleneDAILY MX report only all year
104TetrachloroethyleneDAILY MX report only all year
104NaphthaleneDAILY MX report only all year
104NaphthaleneDAILY MX report only all year
104Flow, in conduit or thru treatment plantMO AVG report only all year
104Flow, in conduit or thru treatment plantDAILY MX report only all year
104Total toxic organics [TTO] [40 CFR433]DAILY MX report only all year
104Total toxic organics [TTO] [40 CFR433]DAILY MX report only all year
204Solids, total suspendedMO AVG report only all year
204Solids, total suspendedDAILY MX report only all year
204Solids, total suspendedMO AVG report only all year
204Solids, total suspendedDAILY MX report only all year
204Oil and grease, hexane extr methodMO AVG report only all year
204Oil and grease, hexane extr methodDAILY MX report only all year
204Oil and grease, hexane extr methodDAILY MX report only all year
204Cyanide, total [as CN]MO AVG report only all year
204Cyanide, total [as CN]DAILY MX report only all year
204Cyanide, total [as CN]MO AVG report only all year
204Cyanide, total [as CN]DAILY MX report only all year
204Fluoride, total [as F]MO AVG report only all year
204Fluoride, total [as F]DAILY MX report only all year
204Fluoride, total [as F]MO AVG report only all year
204Fluoride, total [as F]DAILY MX report only all year
204Nickel, total recoverableMO AVG report only all year
204Nickel, total recoverableDAILY MX report only all year
204Nickel, total recoverableMO AVG report only all year
204Nickel, total recoverableDAILY MX report only all year
204Silver total recoverableMO AVG report only all year
204Silver total recoverableDAILY MX report only all year
204Silver total recoverableMO AVG report only all year
204Silver total recoverableDAILY MX report only all year
204Zinc, total recoverableMO AVG report only all year
204Zinc, total recoverableDAILY MX report only all year
204Zinc, total recoverableMO AVG report only all year
204Zinc, total recoverableDAILY MX report only all year
204Cadmium, total recoverableMO AVG report only all year
204Cadmium, total recoverableDAILY MX report only all year
204Cadmium, total recoverableMO AVG report only all year
204Cadmium, total recoverableDAILY MX report only all year
204Lead, total recoverableMO AVG report only all year
204Lead, total recoverableDAILY MX report only all year
204Lead, total recoverableMO AVG report only all year
204Lead, total recoverableDAILY MX report only all year
204Chromium, total recoverableMO AVG report only all year
204Chromium, total recoverableDAILY MX report only all year
204Chromium, total recoverableMO AVG report only all year
204Chromium, total recoverableDAILY MX report only all year
204Copper, total recoverableMO AVG report only all year
204Copper, total recoverableDAILY MX report only all year
204Copper, total recoverableMO AVG report only all year
204Copper, total recoverableDAILY MX report only all year
204Chromium, hexavalent dissolved [as Cr]MO AVG report only all year
204Chromium, hexavalent dissolved [as Cr]DAILY MX report only all year
204Chromium, hexavalent dissolved [as Cr]MO AVG report only all year
204Chromium, hexavalent dissolved [as Cr]DAILY MX report only all year
204TetrachloroethyleneMO AVG report only all year
204TetrachloroethyleneDAILY MX report only all year
204TetrachloroethyleneDAILY MX report only all year
204NaphthaleneDAILY MX report only all year
204NaphthaleneDAILY MX report only all year
204Flow, in conduit or thru treatment plantMO AVG report only all year
204Flow, in conduit or thru treatment plantDAILY MX report only all year
204Total toxic organics [TTO] [40 CFR433]DAILY MX report only all year
204Total toxic organics [TTO] [40 CFR433]DAILY MX report only all year
304Solids, total suspendedMO AVG report only all year
304Solids, total suspendedDAILY MX report only all year
304Solids, total suspendedMO AVG <= 1147 lb/d all year
304Solids, total suspendedDAILY MX <= 2290 lb/d all year
304Oil and grease, hexane extr methodMO AVG report only all year
304Oil and grease, hexane extr methodDAILY MX report only all year
304Oil and grease, hexane extr methodDAILY MX <= 765 lb/d all year
304Cyanide, total [as CN]MO AVG report only all year
304Cyanide, total [as CN]DAILY MX report only all year
304Cyanide, total [as CN]MO AVG <= 3.41 lb/d all year
304Cyanide, total [as CN]DAILY MX <= 7.95 lb/d all year
304Fluoride, total [as F]MO AVG report only all year
304Fluoride, total [as F]DAILY MX report only all year
304Fluoride, total [as F]MO AVG <= 150 lb/d all year
304Fluoride, total [as F]DAILY MX <= 400 lb/d all year
304Nickel, total recoverableMO AVG report only all year
304Nickel, total recoverableDAILY MX report only all year
304Nickel, total recoverableMO AVG report only all year
304Nickel, total recoverableDAILY MX report only all year
304Silver total recoverableMO AVG report only all year
304Silver total recoverableDAILY MX report only all year
304Silver total recoverableMO AVG report only all year
304Silver total recoverableDAILY MX report only all year
304Zinc, total recoverableMO AVG report only all year
304Zinc, total recoverableDAILY MX report only all year
304Zinc, total recoverableMO AVG <= 10 lb/d all year
304Zinc, total recoverableDAILY MX <= 30 lb/d all year
304Cadmium, total recoverableMO AVG report only all year
304Cadmium, total recoverableDAILY MX report only all year
304Cadmium, total recoverableMO AVG report only all year
304Cadmium, total recoverableDAILY MX report only all year
304Lead, total recoverableMO AVG report only all year
304Lead, total recoverableDAILY MX report only all year
304Lead, total recoverableMO AVG report only all year
304Lead, total recoverableDAILY MX report only all year
304Chromium, total recoverableMO AVG report only all year
304Chromium, total recoverableDAILY MX report only all year
304Chromium, total recoverableMO AVG <= 10 lb/d all year
304Chromium, total recoverableDAILY MX <= 30 lb/d all year
304Copper, total recoverableMO AVG report only all year
304Copper, total recoverableDAILY MX report only all year
304Copper, total recoverableMO AVG report only all year
304Copper, total recoverableDAILY MX report only all year
304Chromium, hexavalent dissolved [as Cr]MO AVG report only all year
304Chromium, hexavalent dissolved [as Cr]DAILY MX report only all year
304Chromium, hexavalent dissolved [as Cr]MO AVG <= .17 lb/d all year
304Chromium, hexavalent dissolved [as Cr]DAILY MX <= .51 lb/d all year
304TetrachloroethyleneMO AVG report only all year
304TetrachloroethyleneDAILY MX report only all year
304TetrachloroethyleneDAILY MX <= 1.29 lb/d all year
304NaphthaleneDAILY MX report only all year
304NaphthaleneDAILY MX <= .86 lb/d all year
304Flow, in conduit or thru treatment plantMO AVG report only all year
304Flow, in conduit or thru treatment plantDAILY MX report only all year
304Total toxic organics [TTO] [40 CFR433]DAILY MX report only all year
304Total toxic organics [TTO] [40 CFR433]DAILY MX <= 38.43 lb/d all year
500Temperature, water deg. fahrenheitMO AVG report only all year
500Temperature, water deg. fahrenheitDAILY MX report only all year
500Temperature, water deg. fahrenheitMO AVG report only all year
500Temperature, water deg. fahrenheitDAILY MX report only all year
500Temperature, water deg. fahrenheitMO AVG report only Dec
500Temperature, water deg. fahrenheitMO AVG report only Jun, Jul, Aug
500Temperature, water deg. fahrenheitMO AVG report only Jan, Feb
500Temperature, water deg. fahrenheitMO AVG report only Mar
500Temperature, water deg. fahrenheitMO AVG report only Apr, Nov
500Temperature, water deg. fahrenheitMO AVG report only Sep, Oct
500Temperature, water deg. fahrenheitMO AVG report only May
500Temperature, water deg. fahrenheitDAILY MX <= 60 deg F Dec
500Temperature, water deg. fahrenheitDAILY MX <= 70 deg F Jun, Jul, Aug
500Temperature, water deg. fahrenheitDAILY MX <= 53 deg F Jan, Feb
500Temperature, water deg. fahrenheitDAILY MX <= 63 deg F Mar
500Temperature, water deg. fahrenheitDAILY MX <= 65 deg F Apr, Nov
500Temperature, water deg. fahrenheitDAILY MX <= 65 deg F Sep, Oct
500Temperature, water deg. fahrenheitDAILY MX <= 65 deg F May
500Temperature, water deg. fahrenheitMO AVG report only Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
500Temperature, water deg. fahrenheitDAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
500Temp. diff. between up/down stream deg. FDAILY MX <= 2 deg F all year
600Surface area, square feetDAILY MX report only all year
600Depth to water level ft below landsurfaceDAILY MX report only all year
600Flow rateDAILY MX report only all year
600Velocity of intakeDAILY MX report only all year
600Cooling Water Intake VelocityDAILY MX <= .5 ft/sec all year

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