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Constellation Energy Generation, LLC

Electric Services, major discharger, Darlington, Maryland. NPDES permit MD0002518, in force until Nov 30, 2026. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (10 values), outfall 001 form Q quarterly (20 values), outfall 003 form A monthly (1 value), outfall 103 form A quarterly (6 values)
Renewal application due
Jun 3, 2026 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 26 reports late

Limits in force (37)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum daily average≤ 45 mg/Lall year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 8.5 SUall year001
Solids, total suspendedmaximum monthly average≤ 30 mg/Lall year001
Solids, total suspendedmaximum daily average≤ 45 mg/Lall year001
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, Dec001
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, Dec001
Nitrogen, total [as N]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Nitrogen, total [as N]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Nitrogen, organic total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, Dec001
Nitrogen, organic total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, Dec001
Nitrogen, organic total [as N]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Nitrogen, organic total [as N]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Ammonia nitrogen, total, [as N] 30 dayquarterly averagereport only (mg/L)Mar, Jun, Sep, Dec001
Ammonia nitrogen, total, [as N] 30 dayquarterly averagereport only (mg/L)Mar, Jun, Sep, Dec001
Ammonia nitrogen, total, [as N] 30 daydaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Ammonia nitrogen, total, [as N] 30 daydaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Nitrite + Nitrate total [as N]quarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Nitrite + Nitrate total [as N]quarterly maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Phosphorus, total [as P]quarterly averagereport only (mg/L)Mar, Jun, Sep, Dec001
Phosphorus, total [as P]quarterly averagereport only (mg/L)Mar, Jun, Sep, Dec001
Phosphorus, total [as P]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Phosphorus, total [as P]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
E. coligeometric mean≤ 126 MPN/100mLall year001
Oxygen, dissolved [DO]minimum≥ 5 mg/LMay–Oct003
Oil & Greasequarterly maximum≤ 15 mg/LMar, Jun, Sep, Dec103
Oil & Greasequarterly maximum≤ 15 mg/LMar, Jun, Sep, Dec103
Flow, in conduit or thru treatment plantquarterly averagereport only (MGD)Mar, Jun, Sep, Dec103
Flow, in conduit or thru treatment plantquarterly averagereport only (MGD)Mar, Jun, Sep, Dec103
Flow, in conduit or thru treatment plantquarterly maximumreport only (MGD)Mar, Jun, Sep, Dec103
Flow, in conduit or thru treatment plantquarterly maximumreport only (MGD)Mar, Jun, Sep, Dec103

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/MD0002518 · MCP: https://passage-data.com/mcp