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Nipsco, Michigan City Generating Station

Electric Services, major discharger, Michigan City, Indiana. NPDES permit IN0000116 expired Mar 31, 2026; its limits still apply. Last 12 months: over a limit 2 times (last April 2026), 3 of 57 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (23 values), outfall 101 form A monthly (8 values), outfall 201 form A monthly (11 values), outfall 301 form A monthly (8 values), outfall 601 form A monthly (12 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 5 required values missing, 0 of 62 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingOutfallParameterReportedLimitOver by
March 2026101Oil and grease, hexane extr method, daily maximum59 mg/L≤ 20 mg/L195%
April 2026001Chlorine, total residual, monthly average< .02 mg/L≤ .01 mg/L100%

Limits in force (92)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Oct001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Jan–Mar001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)May, Nov001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Jun001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Jul–Sep001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Apr001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Dec001
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)Oct001
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)Jan–Mar001
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)May, Nov001
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)Jun001
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)Jul–Sep001
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)Apr001
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)Dec001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Solids, total suspendeddaily maximumreport only (mg/L)all year001
Oil and grease, hexane extr methodmonthly average≤ 10 mg/Lall year001
Oil and grease, hexane extr methoddaily maximum≤ 15 mg/Lall year001
Copper, total recoverablemonthly average≤ 17 ug/Lall year001
Copper, total recoverabledaily maximum≤ 29 ug/Lall year001
Copper, total recoverablemonthly average≤ 2.2 lb/dall year001
Copper, total recoverabledaily maximum≤ 3.75 lb/dall year001
Oxidants, total residualdaily maximum≤ .06 mg/Lall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualdaily maximum≤ .2 mg/Lall year001
Chlorine, total residualmonthly average≤ .01 mg/Lall year001
Chlorine, total residualdaily maximum< .06 mg/Lall year001
Chlorine, total residualmonthly average≤ 1.29 lb/dall year001
Chlorine, total residualdaily maximum< 7.76 lb/dall year001
Mercury, total recoverabledaily maximumreport only (ng/L)Feb, Apr, Jun, Aug, Oct, Dec001
Mercury, total recoverableannual average≤ 3.1 ng/LFeb, Apr, Jun, Aug, Oct, Dec001
Chlorination frequencydaily maximum≤ 4 occur/dall year001
Chlorination durationdaily maximum≤ 40 minall year001
Flow, totalmonthly totalreport only (Mgal/mo)all year001
pHdaily maximumreport only (SU)Jun, Dec002
pHdaily maximumreport only (SU)Jun, Dec002
Solids, total suspendeddaily maximumreport only (mg/L)Jun, Dec002
Solids, total suspendeddaily maximumreport only (mg/L)Jun, Dec002
Oil and grease, hexane extr methoddaily maximumreport only (mg/L)Jun, Dec002
Oil and grease, hexane extr methoddaily maximumreport only (mg/L)Jun, Dec002
Arsenic, total recoverabledaily maximumreport only (mg/L)Jun, Dec002
Arsenic, total recoverabledaily maximumreport only (mg/L)Jun, Dec002
Selenium, total recoverabledaily maximumreport only (mg/L)Jun, Dec002
Selenium, total recoverabledaily maximumreport only (mg/L)Jun, Dec002
Mercury, total recoverabledaily maximumreport only (ng/L)Jun, Dec002
Mercury, total recoverabledaily maximumreport only (ng/L)Jun, Dec002
Chemical Oxygen Demand [COD]daily maximumreport only (mg/L)Jun, Dec002
Chemical Oxygen Demand [COD]daily maximumreport only (mg/L)Jun, Dec002
Storm water flowdaily maximumreport only (MGD)Jun, Dec002
Storm water flowdaily maximumreport only (MGD)Jun, Dec002
pHdaily minimum≥ 6 SUall year101
pHdaily maximum≤ 9 SUall year101
Solids, total suspendedmonthly average≤ 30 mg/Lall year101
Solids, total suspendeddaily maximum≤ 100 mg/Lall year101
Oil and grease, hexane extr methodmonthly average≤ 15 mg/Lall year101
Oil and grease, hexane extr methoddaily maximum≤ 20 mg/Lall year101
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year101
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year101
pHdaily minimum≥ 6 SUall year201
pHdaily maximum≤ 9 SUall year201
Zinc, total recoverablemonthly average≤ 1 mg/Lall year201
Zinc, total recoverabledaily maximum≤ 1 mg/Lall year201
Chromium, total recoverablemonthly average≤ .2 mg/Lall year201
Chromium, total recoverabledaily maximum≤ .2 mg/Lall year201
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year201
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year201
Chlorine, free availablemonthly average≤ .2 mg/Lall year201
Chlorine, free availabledaily maximum≤ .5 mg/Lall year201
Chlorination durationdaily maximum≤ 120 min/dall year201
pHdaily minimum≥ 6 SUall year301
pHdaily maximum≤ 9 SUall year301
Solids, total suspendedmonthly average≤ 30 mg/Lall year301
Solids, total suspendeddaily maximum≤ 50 mg/Lall year301
Oil and grease, hexane extr methodmonthly average≤ 6.7 mg/Lall year301
Oil and grease, hexane extr methoddaily maximum≤ 8.9 mg/Lall year301
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year301
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year301
pHdaily minimum≥ 6 SUall year601
pHdaily maximum≤ 9 SUall year601
Solids, total suspendedmonthly average≤ 30 mg/Lall year601
Solids, total suspendeddaily maximum≤ 50 mg/Lall year601
Oil and grease, hexane extr methodmonthly average≤ 15 mg/Lall year601
Oil and grease, hexane extr methoddaily maximum≤ 20 mg/Lall year601
Iron, total recoverablemonthly average≤ 1 mg/Lall year601
Iron, total recoverabledaily maximum≤ 1 mg/Lall year601
Copper, total recoverablemonthly average≤ 1 mg/Lall year601
Copper, total recoverabledaily maximum≤ 1 mg/Lall year601
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year601
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year601

How strict are these limits?

Cited limits by parameter: Indiana's rules and the federal ones.

Same industry: the 30 Electric Services permits in Indiana.

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