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Aes Warrior Run, Incorporated

Electric Services, Cumberland, Maryland. NPDES permit MD0066079, in force until Mar 31, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A quarterly (42 values), form B quarterly (6 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 24 reports late

Limits in force (48)

ParameterStatisticLimitMonths
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendeddaily maximum≤ 50 mg/Lall year
Oil & Greasemonthly average≤ 12 mg/Lall year
Oil & Greasedaily maximum≤ 16 mg/Lall year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, total [as N]monthly loadreport only (lb/mo)all year
Nitrogen, total [as N]annual total≤ 3641 lb/yrall year
Nitrogen, organic total [as N]monthly averagereport only (mg/L)all year
Nitrogen, organic total [as N]daily maximumreport only (mg/L)all year
Ammonia nitrogen, total, [as N] 30 daymonthly averagereport only (mg/L)all year
Ammonia nitrogen, total, [as N] 30 daydaily maximumreport only (mg/L)all year
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]monthly loadreport only (lb/mo)all year
Phosphorus, total [as P]annual total≤ 166 lb/yrall year
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year
Chromium, total [as Cr]monthly average≤ .1 mg/Lall year
Chromium, total [as Cr]daily maximum≤ .1 mg/Lall year
Copper, total [as Cu]monthly average≤ .024 mg/Lall year
Copper, total [as Cu]monthly average≤ 1 mg/Lall year
Copper, total [as Cu]daily maximum≤ .039 mg/Lall year
Copper, total [as Cu]daily maximum≤ 1 mg/Lall year
Iron, total [as Fe]monthly average≤ 1 mg/Lall year
Iron, total [as Fe]daily maximum≤ 1 mg/Lall year
Nickel, total [as Ni]monthly average≤ .135 mg/Lall year
Nickel, total [as Ni]daily maximum≤ 1.22 mg/Lall year
Silver, total [as Ag]monthly average≤ .022 mg/Lall year
Silver, total [as Ag]daily maximum≤ .022 mg/Lall year
Zinc, total [as Zn]monthly average≤ .307 mg/Lall year
Zinc, total [as Zn]daily maximum≤ .307 mg/Lall year
Temp. diff. between up/down stream deg. Fmonthly averagereport only (deg F)Jun–Sep
Temp. diff. between up/down stream deg. Fdaily maximum≤ 0 deg FJun–Sep
Oxidants, total residualmonthly average≤ .011 mg/Lall year
Oxidants, total residualdaily maximum≤ .019 mg/Lall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flowmonthly averagereport only (gal/d)all year
Flowdaily maximumreport only (MGD)all year
Flowdaily maximum≤ 30 gal/dall year
Flowmonthly averagereport only (MGD)all year
Sulfatemonthly averagereport only (mg/L)all year
Sulfatedaily maximumreport only (mg/L)all year

How strict are these limits?

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

Same industry: the 8 Electric Services permits in Maryland.

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/MD0066079 · MCP: https://passage-data.com/mcp