NIPSCO, MICHIGAN CITY GENERATING STATION

NPDES permit IN0000116 · Major NON-POTW · administratively continued, expires 2026-03-31 · 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 2026-03-31 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

2values over a limit
0required values missing, on 0 form(s)
3of 57 forms filed late

Last period with anything received: 2026-07-31. Most often over: Chlorine, total residual (1), Oil and grease, hexane extr method (1).

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 (92)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheitMO AVG report only Oct
001Temperature, water deg. fahrenheitMO AVG report only Jan, Feb, Mar
001Temperature, water deg. fahrenheitMO AVG report only May, Nov
001Temperature, water deg. fahrenheitMO AVG report only Jun
001Temperature, water deg. fahrenheitMO AVG report only Jul, Aug, Sep
001Temperature, water deg. fahrenheitMO AVG report only Apr
001Temperature, water deg. fahrenheitMO AVG report only Dec
001Temperature, water deg. fahrenheitDAILY MX report only Oct
001Temperature, water deg. fahrenheitDAILY MX report only Jan, Feb, Mar
001Temperature, water deg. fahrenheitDAILY MX report only May, Nov
001Temperature, water deg. fahrenheitDAILY MX report only Jun
001Temperature, water deg. fahrenheitDAILY MX report only Jul, Aug, Sep
001Temperature, water deg. fahrenheitDAILY MX report only Apr
001Temperature, water deg. fahrenheitDAILY MX report only Dec
001pHDAILY MN >= 6 SU all year
001pHDAILY MX <= 9 SU all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedDAILY MX report only all year
001Oil and grease, hexane extr methodMO AVG <= 10 mg/L all year
001Oil and grease, hexane extr methodDAILY MX <= 15 mg/L all year
001Copper, total recoverableMO AVG <= 17 ug/L all year
001Copper, total recoverableDAILY MX <= 29 ug/L all year
001Copper, total recoverableMO AVG <= 2.2 lb/d all year
001Copper, total recoverableDAILY MX <= 3.75 lb/d all year
001Oxidants, total residualDAILY MX <= .06 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
001Chlorine, total residualDAILY MX <= .2 mg/L all year
001Chlorine, total residualMO AVG <= .01 mg/L all year
001Chlorine, total residualDAILY MX < .06 mg/L all year
001Chlorine, total residualMO AVG <= 1.29 lb/d all year
001Chlorine, total residualDAILY MX < 7.76 lb/d all year
001Mercury, total recoverableDAILY MX report only Feb, Apr, Jun, Aug, Oct, Dec
001Mercury, total recoverableANNL AVG <= 3.1 ng/L Feb, Apr, Jun, Aug, Oct, Dec
001Chlorination frequencyDAILY MX <= 4 occur/d all year
001Chlorination durationDAILY MX <= 40 min all year
001Flow, totalMO TOTAL report only all year
002pHDAILY MX report only Jun, Dec
002pHDAILY MX report only Jun, Dec
002Solids, total suspendedDAILY MX report only Jun, Dec
002Solids, total suspendedDAILY MX report only Jun, Dec
002Oil and grease, hexane extr methodDAILY MX report only Jun, Dec
002Oil and grease, hexane extr methodDAILY MX report only Jun, Dec
002Arsenic, total recoverableDAILY MX report only Jun, Dec
002Arsenic, total recoverableDAILY MX report only Jun, Dec
002Selenium, total recoverableDAILY MX report only Jun, Dec
002Selenium, total recoverableDAILY MX report only Jun, Dec
002Mercury, total recoverableDAILY MX report only Jun, Dec
002Mercury, total recoverableDAILY MX report only Jun, Dec
002Chemical Oxygen Demand [COD]DAILY MX report only Jun, Dec
002Chemical Oxygen Demand [COD]DAILY MX report only Jun, Dec
002Storm water flowDAILY MX report only Jun, Dec
002Storm water flowDAILY MX report only Jun, Dec
101pHDAILY MN >= 6 SU all year
101pHDAILY MX <= 9 SU all year
101Solids, total suspendedMO AVG <= 30 mg/L all year
101Solids, total suspendedDAILY MX <= 100 mg/L all year
101Oil and grease, hexane extr methodMO AVG <= 15 mg/L all year
101Oil and grease, hexane extr methodDAILY MX <= 20 mg/L all year
101Flow, in conduit or thru treatment plantMO AVG report only all year
101Flow, in conduit or thru treatment plantDAILY MX report only all year
201pHDAILY MN >= 6 SU all year
201pHDAILY MX <= 9 SU all year
201Zinc, total recoverableMO AVG <= 1 mg/L all year
201Zinc, total recoverableDAILY MX <= 1 mg/L all year
201Chromium, total recoverableMO AVG <= .2 mg/L all year
201Chromium, total recoverableDAILY MX <= .2 mg/L all year
201Flow, in conduit or thru treatment plantMO AVG report only all year
201Flow, in conduit or thru treatment plantDAILY MX report only all year
201Chlorine, free availableMO AVG <= .2 mg/L all year
201Chlorine, free availableDAILY MX <= .5 mg/L all year
201Chlorination durationDAILY MX <= 120 min/d all year
301pHDAILY MN >= 6 SU all year
301pHDAILY MX <= 9 SU all year
301Solids, total suspendedMO AVG <= 30 mg/L all year
301Solids, total suspendedDAILY MX <= 50 mg/L all year
301Oil and grease, hexane extr methodMO AVG <= 6.7 mg/L all year
301Oil and grease, hexane extr methodDAILY MX <= 8.9 mg/L all year
301Flow, in conduit or thru treatment plantMO AVG report only all year
301Flow, in conduit or thru treatment plantDAILY MX report only all year
601pHDAILY MN >= 6 SU all year
601pHDAILY MX <= 9 SU all year
601Solids, total suspendedMO AVG <= 30 mg/L all year
601Solids, total suspendedDAILY MX <= 50 mg/L all year
601Oil and grease, hexane extr methodMO AVG <= 15 mg/L all year
601Oil and grease, hexane extr methodDAILY MX <= 20 mg/L all year
601Iron, total recoverableMO AVG <= 1 mg/L all year
601Iron, total recoverableDAILY MX <= 1 mg/L all year
601Copper, total recoverableMO AVG <= 1 mg/L all year
601Copper, total recoverableDAILY MX <= 1 mg/L all year
601Flow, in conduit or thru treatment plantMO AVG report only all year
601Flow, 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