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Duke Energy Indiana Cayuga Generating Station

Electric Services, major discharger, Cayuga, Indiana. NPDES permit IN0002763, in force until Oct 31, 2030. Last 12 months: no values over a limit, 2 required values missing, 1 of 72 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (31 values), outfall 002 form A monthly (33 values), outfall 002 form BA monthly (2 values), outfall 004 form SM monthly (2 values), outfall 101 form A monthly (28 values), outfall 102 form A monthly (10 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 50 reports late

Limits in force (155)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)Jan, Feb, Mar, Apr, Nov, Dec001
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)May–Oct001
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)May–Oct001
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)Jan, Feb, Mar, Apr, Nov, Dec001
Temperature, water deg. fahrenheitdaily maximum≤ 60 deg FDec001
Temperature, water deg. fahrenheitdaily maximum≤ 70 deg FNov001
Temperature, water deg. fahrenheitdaily maximum≤ 75 deg FMar001
Temperature, water deg. fahrenheitdaily maximum≤ 83 deg FMay001
Temperature, water deg. fahrenheitdaily maximum≤ 93 deg FJun–Sep001
Temperature, water deg. fahrenheitdaily maximum≤ 81 deg FOct001
Temperature, water deg. fahrenheitdaily maximum≤ 80 deg FApr001
Temperature, water deg. fahrenheitdaily maximum≤ 55 deg FJan, Feb001
Streamflowmonthly averagereport only (MGD)all year001
Streamflowdaily maximumreport only (MGD)all year001
Chlorine, total residual [dsg. time]daily maximum≤ 120 min/dall year001
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 averagereport only (mg/L)all year001
Oil and grease, hexane extr methoddaily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly average≤ .77 mg/LMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 1.4 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 1.9 mg/LMay–Nov001
Nitrogen, ammonia total [as N]daily maximum≤ 3.5 mg/LJan, Feb, Mar, Apr, Dec001
Chloride [as Cl]monthly average≤ 410 mg/Lall year001
Chloride [as Cl]daily maximum≤ 710 mg/Lall year001
Selenium, total recoverablemonthly averagereport only (ug/L)all year001
Selenium, total recoverabledaily maximumreport only (ug/L)all year001
Oxidants, total residualmonthly average< .06 mg/Lall 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< .06 mg/Lall year001
Chlorine, total residualdaily maximum< .06 mg/Lall year001
Time of bromine additiondaily maximumreport only (min/d)all year001
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteJan, Apr, Jul, Oct001
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteFeb, May, Aug, Nov001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1 tox chronicJan, Apr, Jul, Oct001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1 tox chronicFeb, May, Aug, Nov001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteJan, Apr, Jul, Oct001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteFeb, May, Aug, Nov001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox chronicJan, Apr, Jul, Oct001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox chronicFeb, May, Aug, Nov001
Bromide [as Br]monthly averagereport only (ug/L)all year001
Bromide [as Br]daily maximumreport only (ug/L)all year001
Mercury, total recoverablemonthly average≤ 12 ng/LFeb, Apr, Jun, Aug, Oct, Dec001
Mercury, total recoverabledaily maximum≤ 20 ng/LFeb, Apr, Jun, Aug, Oct, Dec001
Mercury, total recoverablemonthly averagereport only (lb/d)Feb, Apr, Jun, Aug, Oct, Dec001
Mercury, total recoverabledaily maximumreport only (lb/d)Feb, 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 minimum≥ 6 SUall year002
pHdaily maximum≤ 9 SUall year002
Solids, total suspendedmonthly average≤ 29 mg/Lall year002
Solids, total suspendeddaily maximum≤ 95 mg/Lall year002
Oil and grease, hexane extr methodmonthly average≤ 11 mg/Lall year002
Oil and grease, hexane extr methoddaily maximum≤ 15 mg/Lall year002
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year002
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year002
Chloride [as Cl]monthly averagereport only (mg/L)all year002
Chloride [as Cl]daily maximumreport only (mg/L)all year002
Sulfate, total [as SO4]monthly averagereport only (mg/L)all year002
Sulfate, total [as SO4]daily maximumreport only (mg/L)all year002
Arsenic, total recoverablemonthly averagereport only (ug/L)all year002
Arsenic, total recoverabledaily maximumreport only (ug/L)all year002
Selenium, total recoverablemonthly averagereport only (ug/L)all year002
Selenium, total recoverabledaily maximumreport only (ug/L)all year002
Zinc, total recoverablemonthly averagereport only (ug/L)all year002
Zinc, total recoverabledaily maximumreport only (ug/L)all year002
Aluminum, total recoverablemonthly averagereport only (mg/L)all year002
Aluminum, total recoverabledaily maximumreport only (mg/L)all year002
Aluminum, dissolved [as Al]monthly averagereport only (mg/L)all year002
Aluminum, dissolved [as Al]daily maximumreport only (mg/L)all year002
Cadmium, total recoverablemonthly averagereport only (ug/L)all year002
Cadmium, total recoverabledaily maximumreport only (ug/L)all year002
Copper, total recoverablemonthly averagereport only (ug/L)all year002
Copper, total recoverabledaily maximumreport only (ug/L)all year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Flow, in conduit or thru treatment plant30-day average≤ .0754 MGDall year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Chlorine, total residualmonthly average≤ .06 mg/Lall year002
Chlorine, total residualdaily maximum< .06 mg/Lall year002
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteJan, Apr, Jul, Oct002
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteFeb, May, Aug, Nov002
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1.5 tox chronicJan, Apr, Jul, Oct002
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1.5 tox chronicFeb, May, Aug, Nov002
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteJan, Apr, Jul, Oct002
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteFeb, May, Aug, Nov002
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1.5 tox chronicJan, Apr, Jul, Oct002
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1.5 tox chronicFeb, May, Aug, Nov002
Bromide [as Br]monthly averagereport only (ug/L)all year002
Bromide [as Br]daily maximumreport only (ug/L)all year002
Mercury, total recoverablemonthly averagereport only (ng/L)Feb, Apr, Jun, Aug, Oct, Dec002
Mercury, total recoverabledaily maximumreport only (ng/L)Feb, Apr, Jun, Aug, Oct, Dec002
Flow, totalmonthly totalreport only (Mgal/mo)all year002
pHdaily maximumreport only (SU)Jun, Dec004
pHdaily maximumreport only (SU)Jun, Dec004
Solids, total suspendeddaily maximumreport only (mg/L)Jun, Dec004
Solids, total suspendeddaily maximumreport only (mg/L)Jun, Dec004
Oil and grease, hexane extr methoddaily maximumreport only (mg/L)Jun, Dec004
Oil and grease, hexane extr methoddaily maximumreport only (mg/L)Jun, Dec004
Selenium, total recoverabledaily maximumreport only (mg/L)all year004
Zinc, total recoverabledaily maximumreport only (mg/L)all year004
Benzene, ethylbenzene, toluene, xylene combinationdaily maximumreport only (mg/L)Jun, Dec004
Benzene, ethylbenzene, toluene, xylene combinationdaily maximumreport only (mg/L)Jun, Dec004
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)Jun, Dec004
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)Jun, Dec004
Storm water flowdaily maximumreport only (MGD)Jun, Dec004
Storm water flowdaily maximumreport only (MGD)Jun, Dec004
Flow, totalsemi-annual totalreport only (Mgal/6mo)Jun, Dec004
Flow, totalsemi-annual totalreport only (Mgal/6mo)Jun, Dec004
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
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year101
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year101
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year101
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year101
Arsenic, total recoverablemonthly averagereport only (ug/L)all year101
Arsenic, total recoverabledaily maximum≤ 85 ug/Lall year101
Selenium, total recoverablemonthly averagereport only (ug/L)all year101
Selenium, total recoverabledaily maximumreport only (ug/L)all year101
Cadmium, total recoverablemonthly averagereport only (ug/L)all year101
Cadmium, total recoverabledaily maximum≤ 59 ug/Lall year101
Lead, total recoverablemonthly averagereport only (ug/L)all year101
Lead, total recoverabledaily maximum≤ 11 ug/Lall year101
Chromium, total recoverablemonthly averagereport only (ug/L)all year101
Chromium, total recoverabledaily maximum≤ 361 ug/Lall year101
Copper, total recoverablemonthly averagereport only (ug/L)all year101
Copper, total recoverabledaily maximum≤ 50 ug/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
Solids, total dissolvedmonthly averagereport only (mg/L)all year101
Solids, total dissolveddaily maximumreport only (mg/L)all year101
Bromide [as Br]monthly averagereport only (mg/L)all year101
Bromide [as Br]daily maximumreport only (mg/L)all year101
Mercury, total recoverablemonthly averagereport only (ng/L)Feb, Jun, Oct101
Mercury, total recoverabledaily maximum≤ 50000 ng/LFeb, Jun, Oct101
Solids, total suspendedmonthly average≤ 30 mg/Lall year102
Solids, total suspendeddaily maximum≤ 60 mg/Lall year102
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year102
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year102
Chlorine, total residualmonthly averagereport only (mg/L)Apr–Oct102
Chlorine, total residualdaily maximumreport only (mg/L)Apr–Oct102
E. coli, colony forming units [CFU]monthly geometric mean≤ 125 CFU/100mLApr–Oct102
E. coli, colony forming units [CFU]daily maximum≤ 235 CFU/100mLApr–Oct102
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year102
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 40 mg/Lall year102

New limits from Nov 1, 2028

ParameterNew limitFromNew or tighterMedian, last 12 months× new limit
Bromide [as Br], daily maximum outfall 1010.2 mg/LJan 1, 2029new31 mg/L (10 values)155×
Mercury, total recoverable, daily maximum outfall 10123 ng/L (Feb, Jun, Oct)Jan 1, 2029tighter160 ng/L (3 values)6.96×
Nitrite + Nitrate total [as N], daily maximum outfall 1012 mg/LJan 1, 2029new110 mg/L (11 values)55×
Nitrite + Nitrate total [as N], monthly average outfall 1011.2 mg/LJan 1, 2029new91 mg/L (11 values)75.8×
Selenium, total recoverable, daily maximum outfall 10110 ug/LJan 1, 2029new210 ug/L (11 values)21×
Solids, total dissolved, daily maximum outfall 101306 mg/LJan 1, 2029new20600 mg/L (11 values)67.3×
Solids, total dissolved, monthly average outfall 101149 mg/LJan 1, 2029new19300 mg/L (11 values)130×
Zinc, total recoverable, daily maximum outfall 0040.43 mg/LNov 1, 2028new0.149 mg/L (9 values)0.347×
Arsenic, total recoverable, daily maximum outfall 1015 ug/LJan 1, 2029tighter4.03 ug/L (11 values, 1 below detection)0.806×

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.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IN0002763 · MCP: https://passage-data.com/mcp