AMERICAN ELECTRIC POWER, ROCKPORT PLANT

NPDES permit IN0051845 · Major NON-POTW · administratively continued, expires 2025-11-30 · 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.

This permit expired on 2025-11-30 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

0values over a limit
0required values missing, on 0 form(s)
0of 95 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 (178)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheitMO AVG report only all year
001Temperature, water deg. fahrenheitDAILY MX report only all year
001pHDAILY MN >= 6 SU all year
001pHDAILY MX <= 9 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedDAILY MX <= 100 mg/L 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
001Nitrogen, ammonia total [as N]DAILY MX report only Dec
001Nitrogen, ammonia total [as N]DAILY MX report only Dec
001Nitrogen, Kjeldahl, total [as N]DAILY MX report only Dec
001Nitrogen, Kjeldahl, total [as N]DAILY MX report only Dec
001Nitrite + Nitrate total [as N]DAILY MX report only Dec
001Nitrite + Nitrate total [as N]DAILY MX report only Dec
001Phosphorus, total [as P]DAILY MX report only Dec
001Phosphorus, total [as P]DAILY MX report only Dec
001Selenium, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Selenium, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
001Copper, total recoverableMO AVG <= .033 mg/L all year
001Copper, total recoverableDAILY MX <= .067 mg/L all year
001Chromium, hexavalent dissolved [as Cr]DAILY MX report only Mar, Jun, Sep, Dec
001Chromium, hexavalent dissolved [as Cr]DAILY MX report only Mar, Jun, Sep, Dec
001Clamtrol CT-1, Total WaterDAILY MX < .6 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 residualMO AVG < .06 mg/L all year
001Chlorine, total residualDAILY MX < .06 mg/L all year
001Mercury, total recoverableMO AVG report only Feb, Apr, Jun, Aug, Oct, Dec
001Mercury, total recoverableDAILY MX report only Feb, Apr, Jun, Aug, Oct, Dec
001Flow, totalMO TOTAL report only all year
002pHDAILY MN >= 6 SU all year
002pHDAILY MX <= 9 SU all year
002Solids, total suspendedDAILY MX <= 50 mg/L all year
002Nitrogen, ammonia total [as N]DAILY MX report only Dec
002Nitrogen, ammonia total [as N]DAILY MX report only Dec
002Nitrogen, Kjeldahl, total [as N]DAILY MX report only Dec
002Nitrogen, Kjeldahl, total [as N]DAILY MX report only Dec
002Nitrite + Nitrate total [as N]DAILY MX report only Dec
002Nitrite + Nitrate total [as N]DAILY MX report only Dec
002Phosphorus, total [as P]DAILY MX report only Dec
002Phosphorus, total [as P]DAILY MX report only Dec
002Chloride [as Cl]MO AVG report only all year
002Chloride [as Cl]DAILY MX report only all year
002Sulfate, total [as SO4]MO AVG report only all year
002Sulfate, total [as SO4]DAILY MX report only all year
002Fluoride, total [as F]MO AVG <= 1.6 mg/L all year
002Fluoride, total [as F]DAILY MX <= 3.3 mg/L all year
002Selenium, total recoverableMO AVG <= .029 mg/L all year
002Selenium, total recoverableDAILY MX <= .057 mg/L all year
002Boron, total recoverableMO AVG report only Mar, Jun, Sep, Dec
002Boron, total recoverableMO AVG report only Mar, Jun, Sep, Dec
002Boron, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
002Boron, total recoverableDAILY MX report only Mar, Jun, Sep, Dec
002Zinc, total recoverableMO AVG report only all year
002Zinc, total recoverableDAILY MX report only all year
002Aluminum, total recoverableMO AVG report only all year
002Aluminum, total recoverableDAILY MX report only all year
002Lead, total recoverableMO AVG <= .0084 mg/L all year
002Lead, total recoverableDAILY MX <= .017 mg/L all year
002Chromium, total recoverableMO AVG <= .37 mg/L all year
002Chromium, total recoverableDAILY MX <= .74 mg/L all year
002Copper, total recoverableMO AVG report only all year
002Copper, total recoverableDAILY MX report only all year
002Vanadium, total recoverableMO AVG report only all year
002Vanadium, total recoverableDAILY MX report only all year
002Chromium, hexavalent dissolved [as Cr]MO AVG <= .0087 mg/L all year
002Chromium, hexavalent dissolved [as Cr]DAILY MX <= .017 mg/L all year
002Flow, in conduit or thru treatment plantMO AVG report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
002Mercury, total recoverableMO AVG report only Feb, Apr, Jun, Aug, Oct, Dec
002Mercury, total recoverableDAILY MX report only Feb, Apr, Jun, Aug, Oct, Dec
002Flow, augmented waterMO AVG report only all year
002Flow, augmented waterDAILY MX report only all year
002Storm water flowMO AVG report only all year
002Storm water flowDAILY MX report only all year
002Flow, totalMO TOTAL report only 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
101Iron, total recoverableMO AVG <= 1 mg/L all year
101Iron, total recoverableDAILY MX <= 1 mg/L all year
101Copper, total recoverableMO AVG <= 1 mg/L all year
101Copper, total recoverableDAILY MX <= 1 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
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
202pHDAILY MN >= 6 SU all year
202pHDAILY MX <= 9 SU all year
202Solids, total suspendedMO AVG <= 30 mg/L all year
202Solids, total suspendedDAILY MX <= 100 mg/L all year
202Oil and grease, hexane extr methodMO AVG <= 15 mg/L all year
202Oil and grease, hexane extr methodDAILY MX <= 20 mg/L all year
202Flow, in conduit or thru treatment plantMO AVG report only all year
202Flow, in conduit or thru treatment plantDAILY MX report only all year
303pHDAILY MX report only Jul
303Solids, total suspendedDAILY MX report only Jul
303Oil and grease, hexane extr methodDAILY MX report only Jul
303Nitrogen, Kjeldahl, total [as N]DAILY MX report only Jul
303Nitrite + Nitrate total [as N]DAILY MX report only Jul
303Phosphorus, total [as P]DAILY MX report only Jul
303BOD, carbonaceous [5 day, 20 C]DAILY MX report only Jul
303Chemical Oxygen Demand [COD]DAILY MX report only Jul
303Storm water flowET report only Jul
304pHDAILY MX report only Jul
304Solids, total suspendedDAILY MX report only Jul
304Oil and grease, hexane extr methodDAILY MX report only Jul
304Nitrogen, Kjeldahl, total [as N]DAILY MX report only Jul
304Nitrite + Nitrate total [as N]DAILY MX report only Jul
304Phosphorus, total [as P]DAILY MX report only Jul
304BOD, carbonaceous [5 day, 20 C]DAILY MX report only Jul
304Chemical Oxygen Demand [COD]DAILY MX report only Jul
304Storm water flowET report only Jul
311pHDAILY MX report only Jul
311Solids, total suspendedDAILY MX report only Jul
311Oil and grease, hexane extr methodDAILY MX report only Jul
311Nitrogen, Kjeldahl, total [as N]DAILY MX report only Jul
311Nitrite + Nitrate total [as N]DAILY MX report only Jul
311Phosphorus, total [as P]DAILY MX report only Jul
311BOD, carbonaceous [5 day, 20 C]DAILY MX report only Jul
311Chemical Oxygen Demand [COD]DAILY MX report only Jul
311Storm water flowET report only Jul
314pHDAILY MX report only Jul
314Solids, total suspendedDAILY MX report only Jul
314Oil and grease, hexane extr methodDAILY MX report only Jul
314Nitrogen, Kjeldahl, total [as N]DAILY MX report only Jul
314Nitrite + Nitrate total [as N]DAILY MX report only Jul
314Phosphorus, total [as P]DAILY MX report only Jul
314BOD, carbonaceous [5 day, 20 C]DAILY MX report only Jul
314Chemical Oxygen Demand [COD]DAILY MX report only Jul
314Storm water flowET report only Jul
320pHDAILY MX report only Jul
320Solids, total suspendedDAILY MX report only Jul
320Oil and grease, hexane extr methodDAILY MX report only Jul
320Nitrogen, Kjeldahl, total [as N]DAILY MX report only Jul
320Nitrite + Nitrate total [as N]DAILY MX report only Jul
320Phosphorus, total [as P]DAILY MX report only Jul
320BOD, carbonaceous [5 day, 20 C]DAILY MX report only Jul
320Chemical Oxygen Demand [COD]DAILY MX report only Jul
320Storm water flowET report only Jul
322pHDAILY MX report only Jul
322Solids, total suspendedDAILY MX report only Jul
322Oil and grease, hexane extr methodDAILY MX report only Jul
322Nitrogen, Kjeldahl, total [as N]DAILY MX report only Jul
322Nitrite + Nitrate total [as N]DAILY MX report only Jul
322Phosphorus, total [as P]DAILY MX report only Jul
322BOD, carbonaceous [5 day, 20 C]DAILY MX report only Jul
322Chemical Oxygen Demand [COD]DAILY MX report only Jul
322Storm water flowET report only Jul
324pHDAILY MX report only Jul
324Solids, total suspendedDAILY MX report only Jul
324Oil and grease, hexane extr methodDAILY MX report only Jul
324Nitrogen, Kjeldahl, total [as N]DAILY MX report only Jul
324Nitrite + Nitrate total [as N]DAILY MX report only Jul
324Phosphorus, total [as P]DAILY MX report only Jul
324BOD, carbonaceous [5 day, 20 C]DAILY MX report only Jul
324Chemical Oxygen Demand [COD]DAILY MX report only Jul
324Storm water flowET report only Jul
325pHDAILY MX report only Jul
325Solids, total suspendedDAILY MX report only Jul
325Oil and grease, hexane extr methodDAILY MX report only Jul
325Nitrogen, Kjeldahl, total [as N]DAILY MX report only Jul
325Nitrite + Nitrate total [as N]DAILY MX report only Jul
325Phosphorus, total [as P]DAILY MX report only Jul
325BOD, carbonaceous [5 day, 20 C]DAILY MX report only Jul
325Chemical Oxygen Demand [COD]DAILY MX report only Jul
325Storm water flowET report only Jul
U01Cycles Of ConcentrationMO AVG report only all year
U01Cycles Of ConcentrationDAILY MX report only all year
U02Cycles Of ConcentrationMO AVG report only all year
U02Cycles Of ConcentrationDAILY 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