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Constellation Generation Co LLC

Electric Services, major discharger, Marseilles, Illinois. NPDES permit IL0048151 expired Apr 30, 2024; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (9 values), outfall A01 form 0 monthly (4 values), outfall B01 form 0 monthly (12 values), outfall C01 form 0 monthly (12 values), outfall E01 form 0 monthly (6 values), outfall I01 form 0 monthly (4 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 72 reports late

Limits in force (49)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitmonthly maximum≤ 93 deg FApr–Nov001
Temperature, water deg. fahrenheitmonthly maximum≤ 63 deg FJan, Feb, Mar, Dec001
pHmonthly minimum≥ 6 SUall year001
pHmonthly maximum≤ 9 SUall year001
Phosphorus, total [as P]quarterly maximumreport only (mg/L)Jan, Apr, Jul, Oct001
Oxidants, total residualdaily maximum≤ .05 mg/Lall year001
Temperature, length of excursionrolling average≤ 87.6 hr/12moall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualdaily maximum≤ .05 mg/Lall year001
Temperature Increase Deg. Fmonthly maximum≤ 5 deg Fall year001
Solids, total suspended30-day average≤ 15 mg/Lall yearA01
Solids, total suspendeddaily maximum≤ 30 mg/Lall yearA01
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearA01
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearA01
pHmonthly minimum≥ 6 SUall yearB01
pHmonthly maximum≤ 9 SUall yearB01
Solids, total suspended30-day average≤ 30 mg/Lall yearB01
Solids, total suspendeddaily maximum≤ 60 mg/Lall yearB01
Solids, total suspended30-day average≤ 15 lb/dall yearB01
Solids, total suspendeddaily maximum≤ 50 lb/dall yearB01
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearB01
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearB01
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/Lall yearB01
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 50 mg/Lall yearB01
BOD, carbonaceous [5 day, 20 C]30-day average≤ 13 lb/dall yearB01
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 42 lb/dall yearB01
pHmonthly minimum≥ 6 SUall yearC01
pHmonthly maximum≤ 9 SUall yearC01
Solids, total suspended30-day average≤ 15 mg/Lall yearC01
Solids, total suspendeddaily maximum≤ 30 mg/Lall yearC01
Solids, total suspended30-day average≤ 5 lb/dall yearC01
Solids, total suspendeddaily maximum≤ 17 lb/dall yearC01
Oil and grease30-day average≤ 15 mg/Lall yearC01
Oil and greasedaily maximum≤ 20 mg/Lall yearC01
Oil and grease30-day average≤ 2.5 lb/dall yearC01
Oil and greasedaily maximum≤ 3.34 lb/dall yearC01
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearC01
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearC01
Solids, total suspended30-day average≤ 15 mg/Lall yearE01
Solids, total suspendeddaily maximum≤ 30 mg/Lall yearE01
Oil and grease30-day average≤ 15 mg/Lall yearE01
Oil and greasedaily maximum≤ 20 mg/Lall yearE01
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearE01
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearE01
Solids, total suspended30-day average≤ 15 mg/Lall yearI01
Solids, total suspendeddaily maximum≤ 30 mg/Lall yearI01
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearI01
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearI01

How strict are these limits?

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

Same industry: the 45 Electric Services permits in Illinois.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IL0048151 · MCP: https://passage-data.com/mcp