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General James M. Gavin Power Plant

Electric Services, major discharger, Cheshire, Ohio. NPDES permit OH0028762 expired Aug 31, 2026; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 002 form A monthly (8 values), outfall 006 form A monthly (15 values), outfall 007 form A monthly (22 values), outfall 008 form A monthly (16 values), outfall 009 form A monthly (18 values), outfall 011 form A monthly (20 values), and 3 more forms
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 141 reports late

Limits in force (220)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimum≥ 5 mg/LMar, Jun, Aug, Dec002
pHdaily minimum≥ 6.5 SUall year002
pHdaily maximum≤ 9 SUall year002
Solids, total suspendedmonthly average≤ 12 mg/LMar, Jun, Aug, Dec002
Solids, total suspendeddaily maximum≤ 18 mg/LMar, Jun, Aug, Dec002
Solids, total suspendedmonthly average≤ 1.09 kg/dMar, Jun, Aug, Dec002
Solids, total suspendeddaily maximum≤ 1.64 kg/dMar, Jun, Aug, Dec002
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/LJun, Aug002
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Mar, Dec002
Nitrogen, ammonia total [as N]daily maximum≤ 3 mg/LJun, Aug002
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Mar, Dec002
Nitrogen, ammonia total [as N]monthly average≤ .18 kg/dJun, Aug002
Nitrogen, ammonia total [as N]daily maximum≤ .27 kg/dJun, Aug002
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Mar, Jun, Aug, Dec002
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)Mar, Jun, Aug, Dec002
Copper, total recoverablemonthly averagereport only (ug/L)all year002
Copper, total recoverabledaily maximumreport only (ug/L)all year002
Turbidity [severity]monthly averagereport only (severity)all year002
Turbidity [severity]daily maximumreport only (severity)all year002
Coliform, fecal MF, MFC broth, 44.5 Cmonthly geometric mean≤ 1000 #/100mLMar, Dec002
Coliform, fecal MF, MFC broth, 44.5 Cdaily maximum≤ 2000 #/100mLMar, Dec002
E. coli, MTEC-MFmonthly geometric mean≤ 126 MPN/100mLJun, Aug002
E. coli, MTEC-MFweekly geometric mean≤ 240 MPN/100mLJun, Aug002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LMar, Jun, Aug, Dec002
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 15 mg/LMar, Jun, Aug, Dec002
BOD, carbonaceous [5 day, 20 C]monthly average≤ .91 kg/dMar, Jun, Aug, Dec002
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 1.36 kg/dMar, Jun, Aug, Dec002
Zinc, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec004
Zinc, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec004
Copper, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec004
Copper, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec004
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)Mar, Jun, Aug, Dec004
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)Mar, Jun, Aug, Dec004
Mercury, total low levelmonthly averagereport only (ng/L)Mar, Jun, Aug, Dec004
Mercury, total low leveldaily maximumreport only (ng/L)Mar, Jun, Aug, Dec004
Zinc, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec005
Zinc, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec005
Copper, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec005
Copper, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec005
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)Mar, Jun, Aug, Dec005
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)Mar, Jun, Aug, Dec005
Mercury, total low levelmonthly averagereport only (ng/L)Mar, Jun, Aug, Dec005
Mercury, total low leveldaily maximumreport only (ng/L)Mar, Jun, Aug, Dec005
pHdaily minimum≥ 6.5 SUall year006
pHdaily maximum≤ 9 SUall year006
Solids, total suspendedmonthly average≤ 30 mg/Lall year006
Solids, total suspendeddaily maximum≤ 99 mg/Lall year006
Oil and grease, hexane extr methodmonthly average≤ 15 mg/Lall year006
Oil and grease, hexane extr methoddaily maximum≤ 20 mg/Lall year006
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year006
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year006
Copper, total recoverabledaily maximum≤ 33 ug/Lall year006
Copper, total recoverabledaily maximum≤ 1.5 kg/dall year006
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year006
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year006
Chlorine, total residualdaily maximum≤ .038 mg/Lall year006
Mercury, total low levelmonthly averagereport only (ng/L)all year006
Mercury, total low leveldaily maximumreport only (ng/L)all year006
Solids, total dissolved- 180 deg. Cmonthly averagereport only (mg/L)Mar, Jun, Aug, Dec006
Solids, total dissolved- 180 deg. Cdaily maximumreport only (mg/L)Mar, Jun, Aug, Dec006
pHdaily minimum≥ 6 SUall year007
pHdaily maximum≤ 9 SUall year007
Solids, total suspendedmonthly average≤ 30 mg/Lall year007
Solids, total suspendeddaily maximum≤ 70 mg/Lall year007
Oil and grease, hexane extr methodmonthly average≤ 15 mg/Lall year007
Oil and grease, hexane extr methoddaily maximum≤ 20 mg/Lall year007
Nitrogen, ammonia total [as N]daily maximum≤ 11.5 mg/LJan, Feb, Mar, Apr, Nov, Dec007
Nitrogen, ammonia total [as N]daily maximum≤ 13.2 mg/LMay–Oct007
Nitrogen, ammonia total [as N]daily maximum≤ 15.1 kg/dJan, Feb, Mar, Apr, Nov, Dec007
Nitrogen, ammonia total [as N]daily maximum≤ 17.3 kg/dMay–Oct007
Sulfate, total [as SO4]monthly averagereport only (mg/L)Mar, Jun, Aug, Dec007
Sulfate, total [as SO4]daily maximumreport only (mg/L)Mar, Jun, Aug, Dec007
Fluoride, total [as F]monthly averagereport only (mg/L)all year007
Fluoride, total [as F]daily maximumreport only (mg/L)all year007
Arsenic, total recoverablemonthly average≤ 118 ug/Lall year007
Arsenic, total recoverabledaily maximum≤ 344 ug/Lall year007
Arsenic, total recoverablemonthly average≤ .155 kg/dall year007
Arsenic, total recoverabledaily maximum≤ .452 kg/dall year007
Iron, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec007
Iron, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec007
Selenium, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec007
Selenium, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec007
Boron, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec007
Boron, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec007
Barium, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec007
Barium, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec007
Toxicity, choice of speciesdaily maximum≤ 1 tox acuteMar, Jun, Aug, Dec007
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year007
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year007
Mercury, total low levelmonthly average≤ 30.8 ng/Lall year007
Mercury, total low leveldaily maximum≤ 242 ng/Lall year007
Mercury, total low levelmonthly average≤ .00004 kg/dall year007
Mercury, total low leveldaily maximum≤ .000318 kg/dall year007
Solids, total dissolved- 180 deg. Cmonthly averagereport only (mg/L)all year007
Solids, total dissolved- 180 deg. Cdaily maximumreport only (mg/L)all year007
pHdaily minimum≥ 6 SUall year008
pHdaily maximum≤ 9 SUall year008
Solids, total suspendedmonthly average≤ 30 mg/Lall year008
Solids, total suspendeddaily maximum≤ 70 mg/Lall year008
Oil and grease, hexane extr methodmonthly average≤ 15 mg/Lall year008
Oil and grease, hexane extr methoddaily maximum≤ 20 mg/Lall year008
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Mar, Jun, Aug, Dec008
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Mar, Jun, Aug, Dec008
Chloride [as Cl]monthly averagereport only (mg/L)Mar, Jun, Aug, Dec008
Chloride [as Cl]daily maximumreport only (mg/L)Mar, Jun, Aug, Dec008
Sulfate, total [as SO4]monthly averagereport only (mg/L)Mar, Jun, Aug, Dec008
Sulfate, total [as SO4]daily maximumreport only (mg/L)Mar, Jun, Aug, Dec008
Fluoride, total [as F]monthly averagereport only (mg/L)all year008
Fluoride, total [as F]daily maximumreport only (mg/L)all year008
Arsenic, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec008
Arsenic, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec008
Iron, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec008
Iron, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec008
Selenium, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec008
Selenium, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec008
Boron, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec008
Boron, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec008
Toxicity, choice of speciesdaily maximum≤ 1.6 tox acuteMar, Jun, Aug, Dec008
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year008
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year008
Mercury, total low levelmonthly average≤ 28.8 ng/Lall year008
Mercury, total low leveldaily maximum≤ 242 ng/Lall year008
Mercury, total low levelmonthly average≤ .000041 kg/dall year008
Mercury, total low leveldaily maximum≤ .000348 kg/dall year008
Number of Eventsdaily maximum≤ 40 # exceedJun, Dec008
Solids, total dissolved- 180 deg. Cmonthly averagereport only (mg/L)all year008
Solids, total dissolved- 180 deg. Cdaily maximumreport only (mg/L)all year008
pHdaily minimum≥ 6.5 SUall year009
pHdaily maximum≤ 9 SUall year009
Solids, total suspendedmonthly average≤ 30 mg/Lall year009
Solids, total suspendeddaily maximum≤ 70 mg/Lall year009
Oil and grease, hexane extr methodmonthly average≤ 15 mg/Lall year009
Oil and grease, hexane extr methoddaily maximum≤ 20 mg/Lall year009
Nitrogen, ammonia total [as N]daily maximum≤ 13.6 mg/LMay–Oct009
Nitrogen, ammonia total [as N]daily maximum≤ 13.8 mg/LJan, Feb, Mar, Apr, Nov, Dec009
Nitrogen, ammonia total [as N]daily maximum≤ 20.9 kg/dMay–Oct009
Nitrogen, ammonia total [as N]daily maximum≤ 21.2 kg/dJan, Feb, Mar, Apr, Nov, Dec009
Sulfate, total [as SO4]monthly averagereport only (mg/L)Mar, Jun, Aug, Dec009
Sulfate, total [as SO4]daily maximumreport only (mg/L)Mar, Jun, Aug, Dec009
Arsenic, total recoverablemonthly average≤ 151 ug/Lall year009
Arsenic, total recoverabledaily maximum≤ 479 ug/Lall year009
Arsenic, total recoverablemonthly average≤ .232 kg/dall year009
Arsenic, total recoverabledaily maximum≤ .736 kg/dall year009
Selenium, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec009
Selenium, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec009
Boron, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec009
Boron, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec009
Copper, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec009
Copper, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec009
Toxicity, choice of speciesdaily maximum≤ 1 tox acuteMar, Jun, Aug, Dec009
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year009
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year009
Mercury, total low levelmonthly average≤ 66.4 ng/Lall year009
Mercury, total low leveldaily maximum≤ 242 ng/Lall year009
Mercury, total low levelmonthly average≤ .000102 kg/dall year009
Mercury, total low leveldaily maximum≤ .000372 kg/dall year009
Solids, total dissolved- 180 deg. Cmonthly averagereport only (mg/L)Mar, Jun, Aug, Dec009
Solids, total dissolved- 180 deg. Cdaily maximumreport only (mg/L)Mar, Jun, Aug, Dec009
pHdaily minimum≥ 6 SUall year011
pHdaily maximum≤ 9 SUall year011
Solids, total suspendedmonthly average≤ 30 mg/Lall year011
Solids, total suspendeddaily maximum≤ 70 mg/Lall year011
Oil and grease, hexane extr methodmonthly average≤ 15 mg/Lall year011
Oil and grease, hexane extr methoddaily maximum≤ 20 mg/Lall year011
Nitrogen, ammonia total [as N]daily maximum≤ 13.2 mg/LMay–Oct011
Nitrogen, ammonia total [as N]daily maximum≤ 11.5 mg/LJan, Feb, Mar, Apr, Nov, Dec011
Nitrogen, ammonia total [as N]daily maximum≤ 19.5 kg/dMay–Oct011
Nitrogen, ammonia total [as N]daily maximum≤ 17 kg/dJan, Feb, Mar, Apr, Nov, Dec011
Chloride [as Cl]monthly averagereport only (mg/L)Mar, Jun, Aug, Dec011
Chloride [as Cl]daily maximumreport only (mg/L)Mar, Jun, Aug, Dec011
Sulfate, total [as SO4]monthly averagereport only (mg/L)Mar, Jun, Aug, Dec011
Sulfate, total [as SO4]daily maximumreport only (mg/L)Mar, Jun, Aug, Dec011
Fluoride, total [as F]monthly averagereport only (mg/L)all year011
Fluoride, total [as F]daily maximumreport only (mg/L)all year011
Arsenic, total recoverablemonthly average≤ 118 ug/Lall year011
Arsenic, total recoverabledaily maximum≤ 344 ug/Lall year011
Arsenic, total recoverablemonthly average≤ .174 kg/dall year011
Arsenic, total recoverabledaily maximum≤ .508 kg/dall year011
Iron, total recoverablemonthly average≤ 5752 ug/Lall year011
Iron, total recoverablemonthly average≤ 7.55 kg/dall year011
Selenium, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec011
Selenium, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec011
Boron, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec011
Boron, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec011
Barium, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec011
Barium, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec011
Copper, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec011
Copper, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec011
Toxicity, choice of speciesdaily maximum≤ 1 tox acuteMar, Jun, Aug, Dec011
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year011
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year011
Mercury, total low levelmonthly averagereport only (ng/L)all year011
Mercury, total low leveldaily maximumreport only (ng/L)all year011
Solids, total dissolved- 180 deg. Cmonthly averagereport only (mg/L)Mar, Jun, Aug, Dec011
Solids, total dissolved- 180 deg. Cdaily maximumreport only (mg/L)Mar, Jun, Aug, Dec011
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year021
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year021
Specific conductancemonthly averagereport only (umho/cm)all year022
Specific conductancedaily maximumreport only (umho/cm)all year022
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year022
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year022
Sludge weight, drymonthly averagereport only (dry ton)Dec588
Sludge weight, drydaily maximumreport only (dry ton)Dec588
Sludge waste from secondary clarifiersmonthly averagereport only (gal)Dec588
Sludge waste from secondary clarifiersdaily maximumreport only (gal)Dec588
pHdaily minimumreport only (SU)all year606
pHdaily maximumreport only (SU)all year606
Solids, total suspendedmonthly averagereport only (mg/L)all year606
Solids, total suspendeddaily maximumreport only (mg/L)all year606
Copper, total [as Cu]monthly averagereport only (ug/L)all year606
Copper, total [as Cu]daily maximumreport only (ug/L)all year606
Iron, total [as Fe]monthly averagereport only (ug/L)all year606
Iron, total [as Fe]daily maximumreport only (ug/L)all year606
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year606
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year606
Number of Eventsdaily maximum≤ 0 # exceedall year616
Cycles Of Concentrationmonthly averagereport only (c)all year800
Cycles Of Concentrationdaily maximumreport only (c)all year800

How strict are these limits?

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

Same industry: the 31 Electric Services permits in Ohio.

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