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GenOn Chalk Point, LLC

Electric Services, major discharger, Aquasco, Maryland. NPDES permit MD0002658, in force until Feb 28, 2030. Last 12 months: over a limit 2 times (last March 2026), 4 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (2 values), outfall 102 form A monthly (31 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 4 of 39 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
December 2025Solids, total suspended, daily maximum54 mg/L≤ 50 mg/L8%
March 2026Solids, total suspended, daily maximum53 mg/L≤ 50 mg/L6%

Limits in force (33)

ParameterStatisticLimitMonthsOutfall
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
pHminimum≥ 6.5 SUall year102
pHmaximum≤ 8.5 SUall year102
Solids, total suspendedmonthly average≤ 30 mg/Lall year102
Solids, total suspendeddaily maximum≤ 50 mg/Lall year102
Oil & Greasemonthly average≤ 15 mg/Lall year102
Oil & Greasedaily maximum≤ 20 mg/Lall year102
Nitrogen, total [as N]monthly averagereport only (mg/L)all year102
Nitrogen, total [as N]daily maximumreport only (mg/L)all year102
Nitrogen, total [as N]monthly loadreport only (lb/mo)all year102
Nitrogen, total [as N]annual maximum≤ 1500 lb/yrall year102
Nitrogen, organic total [as N]monthly averagereport only (mg/L)all year102
Nitrogen, organic total [as N]daily maximumreport only (mg/L)all year102
Ammonia nitrogen, total, [as N] 30 daymonthly averagereport only (mg/L)all year102
Ammonia nitrogen, total, [as N] 30 daymonthly averagereport only (mg/L)all year102
Ammonia nitrogen, total, [as N] 30 daydaily maximumreport only (mg/L)all year102
Ammonia nitrogen, total, [as N] 30 daydaily maximumreport only (mg/L)all year102
Ammonia nitrogen, total, [as N] 30 daydaily maximum≤ 25 lb/dall year102
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year102
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year102
Phosphorus, total [as P]monthly averagereport only (mg/L)all year102
Phosphorus, total [as P]daily maximumreport only (mg/L)all year102
Phosphorus, total [as P]monthly loadreport only (lb/mo)all year102
Phosphorus, total [as P]annual maximum≤ 30 lb/yrall year102
Copper, total [as Cu]daily maximum≤ 1 mg/Lall year102
Iron, total [as Fe]daily maximum≤ 1 mg/Lall year102
Oxidants, total residualmonthly average≤ .0075 mg/Lall year102
Oxidants, total residualdaily maximum≤ .013 mg/Lall year102
Flow, in conduit or thru treatment plantdaily maximum≤ 10000 gal/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
Temperature, summer [deg. F]daily maximumreport only (deg F)all year102

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.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MD0002658 · MCP: https://passage-data.com/mcp