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Calpine Mid-Atlantic

Electric Services, major discharger, Wilmington, Delaware. NPDES permit DE0000558 expired Jul 31, 2023; its limits still apply. 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 (18 values), outfall 003 form A monthly (3 values), outfall 016 form A monthly (6 values)
Last report on file
July 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 3 of 36 reports late

Limits in force (29)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitdaily averagereport only (deg F)Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec001
Temperature, water deg. fahrenheitdaily averagereport only (deg F)Jul–Sep001
Temperature, water deg. fahrenheitdaily maximum≤ 96 deg FJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec001
Temperature, water deg. fahrenheitdaily maximum≤ 103 deg FJul–Sep001
Temperature, water deg. fahrenheitdaily averagereport only (deg F)all year001
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year001
Thermal Dischargedaily average≤ 2560 BTU/hrall year001
Thermal Dischargedaily maximum≤ 3200 BTU/hrall year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Copper, dissolved [as Cu]daily maximumreport only (mg/L)all year001
Copper, dissolved [as Cu]daily maximumreport only (lb/d)all year001
Copper, dissolved [as Cu]daily maximumreport only (mg/L)all year001
Copper, dissolved [as Cu]daily maximumreport only (lb/d)all year001
Iron, total [as Fe]daily maximumreport only (mg/L)all year001
Iron, total [as Fe]daily maximumreport only (lb/d)all year001
Iron, total [as Fe]daily maximumreport only (mg/L)all year001
Iron, total [as Fe]daily maximumreport only (lb/d)all year001
Flow, in conduit or thru treatment plantdaily average≤ 866 MGDall year001
Pump hoursmonthly totalreport only (hr/mo)all year001
pHdaily minimum≥ 6 SUall year003
pHdaily maximum≤ 10 SUall year003
Flow, in conduit or thru treatment plantdaily maximum≤ 3.04 Mgal/moall year003
pHdaily minimum≥ 6 SUall year016
pHdaily maximum≤ 9 SUall year016
Flow, in conduit or thru treatment plantdaily average≤ 3 MGDall year016
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year016
Chlorine, free availabledaily average≤ .2 mg/Lall year016
Chlorine, free availabledaily maximum≤ .5 mg/Lall year016

How strict are these limits?

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

Same industry: the 3 Electric Services permits in Delaware.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/DE0000558 · MCP: https://passage-data.com/mcp