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Electric Services, major discharger, Rockport, Indiana. NPDES permit IN0051845, in force until Sep 30, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | all year | 001 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 001 |
| Oil and grease, hexane extr method | monthly average | ≤ 11.7 mg/L | all year | 001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 15.6 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Dec | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Dec | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Dec | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | Dec | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | Dec | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Dec | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Dec | 001 |
| Selenium, total recoverable | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Copper, total recoverable | monthly average | ≤ .033 mg/L | all year | 001 |
| Copper, total recoverable | daily maximum | ≤ .067 mg/L | all year | 001 |
| Clamtrol CT-1, Total Water | daily maximum | < .6 mg/L | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | monthly average | < .06 mg/L | all year | 001 |
| Chlorine, total residual | daily maximum | < .06 mg/L | all year | 001 |
| Mercury, total recoverable | monthly average | report only (ng/L) | Feb, Apr, Jun, Aug, Oct, Dec | 001 |
| Mercury, total recoverable | daily maximum | report only (ng/L) | Feb, Apr, Jun, Aug, Oct, Dec | 001 |
| Chromium, hexavalent tot recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 002 |
| pH | daily maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 50 mg/L | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Dec | 002 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Dec | 002 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Dec | 002 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | Dec | 002 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | Dec | 002 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Dec | 002 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Dec | 002 |
| Calcium, total recoverable | monthly average | report only (mg/L) | all year | 002 |
| Calcium, total recoverable | daily maximum | report only (mg/L) | all year | 002 |
| Chloride [as Cl] | monthly average | report only (mg/L) | all year | 002 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 002 |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year | 002 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 002 |
| Fluoride, total [as F] | monthly average | report only (mg/L) | all year | 002 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 002 |
| Cobalt, total recoverable | monthly average | report only (mg/L) | all year | 002 |
| Cobalt, total recoverable | daily maximum | report only (mg/L) | all year | 002 |
| Selenium, total recoverable | monthly average | ≤ .029 mg/L | all year | 002 |
| Selenium, total recoverable | daily maximum | ≤ .057 mg/L | all year | 002 |
| Thallium, total recoverable | monthly average | report only (mg/L) | all year | 002 |
| Thallium, total recoverable | daily maximum | report only (mg/L) | all year | 002 |
| Beryllium, total recoverable [as Be] | monthly average | report only (mg/L) | all year | 002 |
| Beryllium, total recoverable [as Be] | daily maximum | report only (mg/L) | all year | 002 |
| Boron, total recoverable | monthly average | report only (mg/L) | Mar, Jun, Sep, Dec | 002 |
| Boron, total recoverable | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 002 |
| Nickel, total recoverable | monthly average | report only (mg/L) | all year | 002 |
| Nickel, total recoverable | daily maximum | report only (mg/L) | all year | 002 |
| Zinc, total recoverable | monthly average | report only (mg/L) | all year | 002 |
| Zinc, total recoverable | daily maximum | report only (mg/L) | all year | 002 |
| Aluminum, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Cadmium, total recoverable | monthly average | report only (mg/L) | all year | 002 |
| Cadmium, total recoverable | daily maximum | report only (mg/L) | all year | 002 |
| Lead, total recoverable | monthly average | report only (mg/L) | all year | 002 |
| Lead, total recoverable | daily maximum | report only (mg/L) | all year | 002 |
| Chromium, total recoverable | monthly average | report only (mg/L) | all year | 002 |
| Chromium, total recoverable | daily maximum | report only (mg/L) | all year | 002 |
| Copper, total recoverable | monthly average | report only (mg/L) | all year | 002 |
| Copper, total recoverable | daily maximum | report only (mg/L) | all year | 002 |
| Vanadium, total recoverable | monthly average | report only (mg/L) | all year | 002 |
| Vanadium, total recoverable | daily maximum | report only (mg/L) | all year | 002 |
| Lithium, total [as Li] | monthly average | report only (mg/L) | all year | 002 |
| Lithium, total [as Li] | daily maximum | report only (mg/L) | all year | 002 |
| Antimony, total recoverable | monthly average | report only (mg/L) | all year | 002 |
| Antimony, total recoverable | daily maximum | report only (mg/L) | all year | 002 |
| Radium 226 + radium 228, total | monthly average | report only (pCi/L) | all year | 002 |
| Radium 226 + radium 228, total | daily maximum | report only (pCi/L) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Solids, total dissolved [TDS] | monthly average | report only (mg/L) | all year | 002 |
| Solids, total dissolved [TDS] | daily maximum | report only (mg/L) | all year | 002 |
| Mercury, total recoverable | monthly average | report only (ng/L) | Feb, Apr, Jun, Aug, Oct, Dec | 002 |
| Mercury, total recoverable | daily maximum | report only (ng/L) | Feb, Apr, Jun, Aug, Oct, Dec | 002 |
| Chromium, hexavalent tot recoverable | monthly average | report only (mg/L) | all year | 002 |
| Chromium, hexavalent tot recoverable | daily maximum | report only (mg/L) | all year | 002 |
| Flow, augmented water | monthly average | report only (MGD) | all year | 002 |
| Flow, augmented water | daily maximum | report only (MGD) | all year | 002 |
| Storm water flow | monthly average | report only (MGD) | all year | 002 |
| Storm water flow | daily maximum | report only (MGD) | all year | 002 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 002 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 101 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 101 |
| Oil and grease, hexane extr method | monthly average | ≤ 15 mg/L | all year | 101 |
| Oil and grease, hexane extr method | daily maximum | ≤ 20 mg/L | all year | 101 |
| Iron, total recoverable | monthly average | ≤ 1 mg/L | all year | 101 |
| Iron, total recoverable | daily maximum | ≤ 1 mg/L | all year | 101 |
| Copper, total recoverable | monthly average | ≤ 1 mg/L | all year | 101 |
| Copper, total recoverable | daily maximum | ≤ 1 mg/L | all year | 101 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 101 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 101 |
| Zinc, total recoverable | monthly average | ≤ 1 mg/L | all year | 201 |
| Zinc, total recoverable | daily maximum | ≤ 1 mg/L | all year | 201 |
| Chromium, total recoverable | monthly average | ≤ .2 mg/L | all year | 201 |
| Chromium, total recoverable | daily maximum | ≤ .2 mg/L | all year | 201 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 201 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 201 |
| Chlorine, free available | monthly average | ≤ .2 mg/L | all year | 201 |
| Chlorine, free available | daily maximum | ≤ .5 mg/L | all year | 201 |
| pH | daily minimum | ≥ 6 SU | all year | 202 |
| pH | daily maximum | ≤ 9 SU | all year | 202 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 202 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 202 |
| Oil and grease, hexane extr method | monthly average | ≤ 15 mg/L | all year | 202 |
| Oil and grease, hexane extr method | daily maximum | ≤ 20 mg/L | all year | 202 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 202 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 202 |
| pH | daily maximum | report only (SU) | Jul | 303 |
| Solids, total suspended | daily maximum | report only (mg/L) | Jul | 303 |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | Jul | 303 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Jul | 303 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | Jul | 303 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jul | 303 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | Jul | 303 |
| Chemical Oxygen Demand [COD] | daily maximum | report only (mg/L) | Jul | 303 |
| Storm water flow | event total | report only (MGD) | Jul | 303 |
| pH | daily maximum | report only (SU) | Jul | 304 |
| Solids, total suspended | daily maximum | report only (mg/L) | Jul | 304 |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | Jul | 304 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Jul | 304 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | Jul | 304 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jul | 304 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | Jul | 304 |
| Chemical Oxygen Demand [COD] | daily maximum | report only (mg/L) | Jul | 304 |
| Storm water flow | event total | report only (MGD) | Jul | 304 |
| pH | daily maximum | report only (SU) | Jul | 311 |
| Solids, total suspended | daily maximum | report only (mg/L) | Jul | 311 |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | Jul | 311 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Jul | 311 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | Jul | 311 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jul | 311 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | Jul | 311 |
| Chemical Oxygen Demand [COD] | daily maximum | report only (mg/L) | Jul | 311 |
| Storm water flow | event total | report only (MGD) | Jul | 311 |
| pH | daily maximum | report only (SU) | Jul | 314 |
| Solids, total suspended | daily maximum | report only (mg/L) | Jul | 314 |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | Jul | 314 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Jul | 314 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | Jul | 314 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jul | 314 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | Jul | 314 |
| Chemical Oxygen Demand [COD] | daily maximum | report only (mg/L) | Jul | 314 |
| Storm water flow | event total | report only (MGD) | Jul | 314 |
| pH | daily maximum | report only (SU) | Jul | 320 |
| Solids, total suspended | daily maximum | report only (mg/L) | Jul | 320 |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | Jul | 320 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Jul | 320 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | Jul | 320 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jul | 320 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | Jul | 320 |
| Chemical Oxygen Demand [COD] | daily maximum | report only (mg/L) | Jul | 320 |
| Storm water flow | event total | report only (MGD) | Jul | 320 |
| pH | daily maximum | report only (SU) | Jul | 322 |
| Solids, total suspended | daily maximum | report only (mg/L) | Jul | 322 |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | Jul | 322 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Jul | 322 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | Jul | 322 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jul | 322 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | Jul | 322 |
| Chemical Oxygen Demand [COD] | daily maximum | report only (mg/L) | Jul | 322 |
| Storm water flow | event total | report only (MGD) | Jul | 322 |
| pH | daily maximum | report only (SU) | Jul | 324 |
| Solids, total suspended | daily maximum | report only (mg/L) | Jul | 324 |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | Jul | 324 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Jul | 324 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | Jul | 324 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jul | 324 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | Jul | 324 |
| Chemical Oxygen Demand [COD] | daily maximum | report only (mg/L) | Jul | 324 |
| Storm water flow | event total | report only (MGD) | Jul | 324 |
| pH | daily maximum | report only (SU) | Jul | 325 |
| Solids, total suspended | daily maximum | report only (mg/L) | Jul | 325 |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | Jul | 325 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | Jul | 325 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | Jul | 325 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jul | 325 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | Jul | 325 |
| Chemical Oxygen Demand [COD] | daily maximum | report only (mg/L) | Jul | 325 |
| Storm water flow | event total | report only (MGD) | Jul | 325 |
| Cycles Of Concentration | monthly average | report only (c) | all year | U01 |
| Cycles Of Concentration | daily maximum | report only (c) | all year | U01 |
| Cycles Of Concentration | monthly average | report only (c) | all year | U02 |
| Cycles Of Concentration | daily maximum | report only (c) | all year | U02 |
| Parameter | New limit | From | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|---|
| Selenium, total recoverable, daily maximum outfall 002 | 0.0075 mg/L | Oct 1, 2029 | tighter | 0.0225 mg/L (5 values, 2 below detection) | 3× |
| Selenium, total recoverable, monthly average outfall 002 | 0.0031 mg/L | Oct 1, 2029 | tighter | 0.0225 mg/L (5 values, 2 below detection) | 7.26× |
| TU Static 48Hr Acute Daphnia magna, maximum outfall 001 | 1 tox acute (Jan–Mar) | Jan 1, 2027 | new | — | — |
| TU Static 48Hr Acute Daphnia pulex, maximum outfall 001 | 1 tox acute (Jan–Mar) | Jan 1, 2027 | new | — | — |
| Toxicity [acute], Ceriodaphnia dubia, maximum outfall 001 | 1 tox acute (Jan–Mar) | Jan 1, 2027 | new | — | — |
| Toxicity [acute], Pimephales promelas [Fathead Minnow], maximum outfall 001 | 1 tox acute (Jan–Mar) | Jan 1, 2027 | new | — | — |
| TU Static 48Hr Acute Daphnia magna, maximum outfall 001 | 1 tox acute (Mar, Sep) | Apr 1, 2027 | new | — | — |
| TU Static 48Hr Acute Daphnia pulex, maximum outfall 001 | 1 tox acute (Mar, Sep) | Apr 1, 2027 | new | — | — |
| Toxicity [acute], Ceriodaphnia dubia, maximum outfall 001 | 1 tox acute (Mar, Sep) | Apr 1, 2027 | new | — | — |
| Toxicity [acute], Pimephales promelas [Fathead Minnow], maximum outfall 001 | 1 tox acute (Mar, Sep) | Apr 1, 2027 | new | — | — |
| TU Static 48Hr Acute Daphnia magna, maximum outfall 001 | 1 tox acute (Apr, Oct) | May 1, 2027 | new | — | — |
| TU Static 48Hr Acute Daphnia pulex, maximum outfall 001 | 1 tox acute (Apr, Oct) | May 1, 2027 | new | — | — |
| Toxicity [acute], Ceriodaphnia dubia, maximum outfall 001 | 1 tox acute (Apr, Oct) | May 1, 2027 | new | — | — |
| Toxicity [acute], Pimephales promelas [Fathead Minnow], maximum outfall 001 | 1 tox acute (Apr, Oct) | May 1, 2027 | new | — | — |
Cited limits by parameter: Indiana's rules and the federal ones.
Same industry: the 30 Electric Services permits in Indiana.
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On EPA ECHO: Facility report · DMR history
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