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Monongahela Power Company

Electric Services, major discharger, Maidsville, West Virginia. NPDES permit WV0004731 expired May 13, 2026; its limits still apply. Last 12 months: no values over a limit, 342 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 003 form A monthly (20 values), outfall 004 form A monthly (22 values), outfall 009 form B quarterly (8 values), outfall 010 form B quarterly (10 values), outfall 012 form B quarterly (20 values), outfall 102 form A monthly (30 values), and 8 more forms
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 10 required values missing, 2 of 92 reports late

Limits in force (221)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year003
BOD, 5-day, 20 deg. Cdaily maximum≤ 60 mg/Lall year003
BOD, 5-day, 20 deg. Cmonthly average≤ 2.5 lb/dall year003
BOD, 5-day, 20 deg. Cdaily maximum≤ 5 lb/dall year003
pHinstantaneous minimum≥ 6 SUall year003
pHinstantaneous maximum≤ 9 SUall year003
Solids, total suspendedmonthly average≤ 30 mg/Lall year003
Solids, total suspendeddaily maximum≤ 60 mg/Lall year003
Solids, total suspendedmonthly average≤ 2.5 lb/dall year003
Solids, total suspendeddaily maximum≤ 5 lb/dall year003
Nitrogen, ammonia total [as N]monthly average≤ 15 mg/Lall year003
Nitrogen, ammonia total [as N]daily maximum≤ 30 mg/Lall year003
Nitrogen, ammonia total [as N]monthly average≤ 1.25 lb/dall year003
Nitrogen, ammonia total [as N]daily maximum≤ 2.5 lb/dall year003
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year003
Flow, in conduit or thru treatment plantdaily maximum≤ .01 MGDall year003
Chlorine, total residualmonthly average≤ 28 ug/Lall year003
Chlorine, total residualdaily maximum≤ 57 ug/Lall year003
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year003
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year003
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year004
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year004
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year004
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year004
Temp. diff. between samp. & upstrm deg. Fmonthly averagereport only (deg F)all year004
Temp. diff. between samp. & upstrm deg. Fdaily maximum≤ 40 deg Fall year004
pHinstantaneous minimum≥ 6 SUall year004
pHinstantaneous maximum≤ 9 SUall year004
Solids, total suspendedmonthly average≤ 30 mg/Lall year004
Solids, total suspendeddaily maximum≤ 99.4 mg/Lall year004
Solids, total suspendedmonthly averagereport only (lb/d)all year004
Solids, total suspendeddaily maximumreport only (lb/d)all year004
Oil and grease, hexane extr methodmonthly average≤ 14.6 mg/Lall year004
Oil and grease, hexane extr methoddaily maximum≤ 19.7 mg/Lall year004
Oil and grease, hexane extr methodmonthly averagereport only (lb/d)all year004
Oil and grease, hexane extr methoddaily maximumreport only (lb/d)all year004
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year004
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year004
Nitrogen, nitrite total [as N]monthly averagereport only (mg/L)all year004
Nitrogen, nitrite total [as N]daily maximumreport only (mg/L)all year004
Nitrogen, nitrate total [as N]monthly averagereport only (mg/L)all year004
Nitrogen, nitrate total [as N]daily maximumreport only (mg/L)all year004
Chloride [as Cl]monthly averagereport only (mg/L)all year004
Chloride [as Cl]daily maximumreport only (mg/L)all year004
Arsenic, total recoverablemonthly averagereport only (mg/L)all year004
Arsenic, total recoverabledaily maximumreport only (mg/L)all year004
Iron, total recoverablemonthly average≤ 9.45 mg/Lall year004
Iron, total recoverabledaily maximum≤ 25.9 mg/Lall year004
Selenium, total recoverablemonthly average≤ .045 mg/Lall year004
Selenium, total recoverabledaily maximum≤ .091 mg/Lall year004
Beryllium, total recoverable [as Be]monthly averagereport only (mg/L)all year004
Beryllium, total recoverable [as Be]daily maximumreport only (mg/L)all year004
Thallium, total [as Tl]monthly averagereport only (mg/L)all year004
Thallium, total [as Tl]daily maximumreport only (mg/L)all year004
Nickel, total recoverablemonthly averagereport only (mg/L)all year004
Nickel, total recoverabledaily maximumreport only (mg/L)all year004
Zinc, total recoverablemonthly averagereport only (mg/L)all year004
Zinc, total recoverabledaily maximumreport only (mg/L)all year004
Antimony, total [as Sb]monthly averagereport only (mg/L)all year004
Antimony, total [as Sb]daily maximumreport only (mg/L)all year004
Aluminum, total recoverablemonthly averagereport only (mg/L)all year004
Aluminum, total recoverabledaily maximumreport only (mg/L)all year004
Lead, total recoverablemonthly averagereport only (mg/L)all year004
Lead, total recoverabledaily maximumreport only (mg/L)all year004
Copper, total recoverablemonthly averagereport only (mg/L)all year004
Copper, total recoverabledaily maximumreport only (mg/L)all year004
Chromium, hexavalent dissolved [as Cr]monthly averagereport only (mg/L)all year004
Chromium, hexavalent dissolved [as Cr]daily maximumreport only (mg/L)all year004
Bromoformmonthly averagereport only (mg/L)all year004
Bromoformdaily maximumreport only (mg/L)all year004
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year004
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year004
Chlorine, total residualmonthly average≤ 76 mg/Lall year004
Chlorine, total residualdaily maximum≤ 152 mg/Lall year004
Toxicity [chronic], Ceriodaphnia dubiamonthly averagereport only (tox chronic)all year004
Toxicity [chronic], Ceriodaphnia dubiadaily maximumreport only (tox chronic)all year004
Toxicity [chronic], Pimephales promelas [Fathead Minnow]monthly averagereport only (tox chronic)all year004
Toxicity [chronic], Pimephales promelas [Fathead Minnow]daily maximumreport only (tox chronic)all year004
Mercury, total [as Hg]monthly average≤ .097 ug/Lall year004
Mercury, total [as Hg]daily maximum≤ .245 ug/Lall year004
Coliform, fecal generalmonthly averagereport only (#/100mL)all year004
Coliform, fecal generaldaily maximumreport only (#/100mL)all year004
Sulfatemonthly averagereport only (mg/L)all year004
Sulfatedaily maximumreport only (mg/L)all year004
pHinstantaneous minimumreport only (SU)all year009
pHinstantaneous maximumreport only (SU)all year009
Solids, total suspendedmonthly averagereport only (mg/L)all year009
Solids, total suspendeddaily maximumreport only (mg/L)all year009
Arsenic, total recoverablemonthly averagereport only (mg/L)all year009
Arsenic, total recoverabledaily maximumreport only (mg/L)all year009
Iron, total [as Fe]monthly averagereport only (mg/L)all year009
Iron, total [as Fe]daily maximum≤ 1.5 mg/Lall year009
Zinc, total recoverablemonthly averagereport only (mg/L)all year009
Zinc, total recoverabledaily maximumreport only (mg/L)all year009
Aluminum, total recoverablemonthly averagereport only (mg/L)all year009
Aluminum, total recoverabledaily maximumreport only (mg/L)all year009
Copper, total recoverablemonthly averagereport only (mg/L)all year009
Copper, total recoverabledaily maximumreport only (mg/L)all year009
Selenium, total [as Se]monthly averagereport only (mg/L)all year009
Selenium, total [as Se]daily maximumreport only (mg/L)all year009
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 [as Hg]monthly averagereport only (ug/L)all year009
Mercury, total [as Hg]daily maximumreport only (ug/L)all year009
pHinstantaneous minimumreport only (SU)all year010
pHinstantaneous maximumreport only (SU)all year010
Solids, total suspendedmonthly averagereport only (mg/L)all year010
Solids, total suspendeddaily maximumreport only (mg/L)all year010
Arsenic, total recoverablemonthly averagereport only (mg/L)all year010
Arsenic, total recoverabledaily maximumreport only (mg/L)all year010
Iron, total [as Fe]monthly averagereport only (mg/L)all year010
Iron, total [as Fe]daily maximum≤ 1.5 mg/Lall year010
Zinc, total recoverablemonthly averagereport only (mg/L)all year010
Zinc, total recoverabledaily maximumreport only (mg/L)all year010
Aluminum, total recoverablemonthly averagereport only (mg/L)all year010
Aluminum, total recoverabledaily maximumreport only (mg/L)all year010
Copper, total recoverablemonthly averagereport only (mg/L)all year010
Copper, total recoverabledaily maximumreport only (mg/L)all year010
Selenium, total [as Se]monthly averagereport only (mg/L)all year010
Selenium, total [as Se]daily maximumreport only (mg/L)all year010
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year010
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year010
Mercury, total [as Hg]monthly averagereport only (ug/L)all year010
Mercury, total [as Hg]daily maximumreport only (ug/L)all year010
pHinstantaneous minimumreport only (SU)all year011
pHinstantaneous maximumreport only (SU)all year011
Solids, total suspendedmonthly averagereport only (mg/L)all year011
Solids, total suspendeddaily maximumreport only (mg/L)all year011
Arsenic, total recoverablemonthly averagereport only (mg/L)all year011
Arsenic, total recoverabledaily maximumreport only (mg/L)all year011
Iron, total [as Fe]monthly averagereport only (mg/L)all year011
Iron, total [as Fe]daily maximumreport only (mg/L)all year011
Zinc, total recoverablemonthly averagereport only (mg/L)all year011
Zinc, total recoverabledaily maximumreport only (mg/L)all year011
Aluminum, total recoverablemonthly averagereport only (mg/L)all year011
Aluminum, total recoverabledaily maximumreport only (mg/L)all year011
Copper, total recoverablemonthly averagereport only (mg/L)all year011
Copper, total recoverabledaily maximumreport only (mg/L)all year011
Selenium, total [as Se]monthly averagereport only (mg/L)all year011
Selenium, total [as Se]daily maximumreport only (mg/L)all year011
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 [as Hg]monthly averagereport only (ug/L)all year011
Mercury, total [as Hg]daily maximumreport only (ug/L)all year011
pHinstantaneous minimumreport only (SU)all year012
pHinstantaneous maximumreport only (SU)all year012
Solids, total suspendedmonthly averagereport only (mg/L)all year012
Solids, total suspendeddaily maximumreport only (mg/L)all year012
Arsenic, total recoverablemonthly averagereport only (mg/L)all year012
Arsenic, total recoverabledaily maximumreport only (mg/L)all year012
Iron, total [as Fe]monthly averagereport only (mg/L)all year012
Iron, total [as Fe]daily maximumreport only (mg/L)all year012
Zinc, total recoverablemonthly averagereport only (mg/L)all year012
Zinc, total recoverabledaily maximumreport only (mg/L)all year012
Aluminum, total recoverablemonthly averagereport only (mg/L)all year012
Aluminum, total recoverabledaily maximumreport only (mg/L)all year012
Copper, total recoverablemonthly averagereport only (mg/L)all year012
Copper, total recoverabledaily maximumreport only (mg/L)all year012
Selenium, total [as Se]monthly averagereport only (mg/L)all year012
Selenium, total [as Se]daily maximumreport only (mg/L)all year012
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year012
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year012
Mercury, total [as Hg]monthly averagereport only (ug/L)all year012
Mercury, total [as Hg]daily maximumreport only (ug/L)all year012
Nitrite + Nitrate total [as N]monthly average≤ 3 mg/Lall year102
Nitrite + Nitrate total [as N]daily maximum≤ 4 mg/Lall year102
Nitrite + Nitrate total [as N]monthly averagereport only (lb/d)all year102
Nitrite + Nitrate total [as N]daily maximumreport only (lb/d)all year102
Chloride [as Cl]monthly averagereport only (mg/L)all year102
Chloride [as Cl]daily maximumreport only (mg/L)all year102
Chloride [as Cl]monthly average≤ 40886 lb/dall year102
Chloride [as Cl]daily maximum≤ 79523 lb/dall year102
Arsenic, total recoverablemonthly average≤ .008 mg/Lall year102
Arsenic, total recoverabledaily maximum≤ .018 mg/Lall year102
Arsenic, total recoverablemonthly averagereport only (lb/d)all year102
Arsenic, total recoverabledaily maximumreport only (lb/d)all year102
Iron, total recoverablemonthly averagereport only (mg/L)all year102
Iron, total recoverabledaily maximumreport only (mg/L)all year102
Iron, total recoverablemonthly average≤ 218 lb/dall year102
Iron, total recoverabledaily maximum≤ 389 lb/dall year102
Selenium, total recoverablemonthly average≤ .029 mg/Lall year102
Selenium, total recoverabledaily maximum≤ .07 mg/Lall year102
Selenium, total recoverablemonthly averagereport only (lb/d)all year102
Selenium, total recoverabledaily maximumreport only (lb/d)all year102
Aluminum, total recoverablemonthly averagereport only (mg/L)all year102
Aluminum, total recoverabledaily maximumreport only (mg/L)all year102
Aluminum, total recoverablemonthly average≤ 64 lb/dall year102
Aluminum, total recoverabledaily maximum≤ 128 lb/dall 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
Mercury, total [as Hg]monthly average≤ .034 ug/Lall year102
Mercury, total [as Hg]daily maximum≤ .103 ug/Lall year102
Mercury, total [as Hg]monthly averagereport only (lb/d)all year102
Mercury, total [as Hg]daily maximumreport only (lb/d)all year102
pHinstantaneous minimumreport only (SU)all year106
pHinstantaneous maximumreport only (SU)all year106
Solids, total suspendedmonthly averagereport only (mg/L)all year106
Solids, total suspendeddaily maximumreport only (mg/L)all year106
Arsenic, total recoverablemonthly averagereport only (mg/L)all year106
Arsenic, total recoverabledaily maximumreport only (mg/L)all year106
Iron, total [as Fe]monthly averagereport only (mg/L)all year106
Iron, total [as Fe]daily maximumreport only (mg/L)all year106
Zinc, total recoverablemonthly averagereport only (mg/L)all year106
Zinc, total recoverabledaily maximumreport only (mg/L)all year106
Aluminum, total recoverablemonthly averagereport only (mg/L)all year106
Aluminum, total recoverabledaily maximumreport only (mg/L)all year106
Copper, total recoverablemonthly averagereport only (mg/L)all year106
Copper, total recoverabledaily maximumreport only (mg/L)all year106
Selenium, total [as Se]monthly averagereport only (mg/L)all year106
Selenium, total [as Se]daily maximumreport only (mg/L)all year106
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year106
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year106
Mercury, total [as Hg]monthly averagereport only (ug/L)all year106
Mercury, total [as Hg]daily maximumreport only (ug/L)all year106
Copper, total [as Cu]monthly average≤ 1 mg/Lall year202
Copper, total [as Cu]daily maximum≤ 1 mg/Lall year202
Iron, total [as Fe]monthly average≤ 1 mg/Lall year202
Iron, total [as Fe]daily maximum≤ 1 mg/Lall year202
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year202
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year202
Toxics, percent removalminimum 7-day average≥ 96 %all yearINT

How strict are these limits?

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

Same industry: the 24 Electric Services permits in West Virginia.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WV0004731 · MCP: https://passage-data.com/mcp