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Exelon Generation Company LLC

Electric Services, major discharger, Byron, Illinois. NPDES permit IL0048313 expired Aug 31, 2021; 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 (16 values), outfall 002 form 0 monthly (8 values), outfall A01 form 0 monthly (4 values), outfall B01 form 0 monthly (12 values), outfall C01 form 0 monthly (6 values), outfall D01 form 0 monthly (4 values), and 2 more forms
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 96 reports late

Limits in force (80)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitmonthly maximumreport only (deg F)all year001
pHmonthly minimum≥ 6 SUall year001
pHmonthly maximum≤ 9 SUall year001
Oil & Grease30-day average≤ 15 mg/Lall year001
Oil & Greasedaily maximum≤ 20 mg/Lall year001
Chromium, total [as Cr]daily maximum≤ .2 mg/LJan, Jul001
Copper, total [as Cu]daily maximumreport only (mg/L)all year001
Zinc, total [as Zn]30-day average≤ .213 mg/Lall year001
Zinc, total [as Zn]daily maximum≤ .433 mg/Lall year001
Oxidants, total residualdaily maximum≤ .05 mg/Lall year001
Priority Pollutantsdaily maximumreport only (mg/L)all year001
Priority Pollutantsdaily maximumreport only (lb/d)all 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
Hydrazine30-day average≤ .011 mg/Lall year001
Hydrazinedaily maximum≤ .027 mg/Lall year001
Solids, total suspended30-day average≤ 15 mg/Lall year002
Solids, total suspendeddaily maximum≤ 30 mg/Lall year002
Solids, total suspended30-day average≤ 30 mg/Lall year002
Solids, total suspendeddaily maximum≤ 100 mg/Lall year002
Oil & Grease30-day average≤ 15 mg/Lall year002
Oil & Greasedaily maximum≤ 20 mg/Lall year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
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
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/Lall yearB01
BOD, 5-day, 20 deg. Cdaily maximum≤ 60 mg/Lall yearB01
BOD, 5-day, 20 deg. C30-day average≤ 5.3 lb/dall yearB01
BOD, 5-day, 20 deg. Cdaily maximum≤ 10.5 lb/dall yearB01
pHminimum≥ 6 SUall yearB01
pHmaximum≤ 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≤ 5.3 lb/dall yearB01
Solids, total suspendeddaily maximum≤ 10.5 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
Solids, total suspended30-day average≤ 15 mg/Lall yearC01
Solids, total suspendeddaily maximum≤ 30 mg/Lall yearC01
Oil & Grease30-day average≤ 15 mg/Lall yearC01
Oil & Greasedaily maximum≤ 20 mg/Lall 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 yearD01
Solids, total suspendeddaily maximum≤ 30 mg/Lall yearD01
Oil & Grease30-day average≤ 15 mg/LJan, JulD01
Oil & Greasedaily maximum≤ 20 mg/LJan, JulD01
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD01
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearD01
Solids, total suspended30-day average≤ 15 mg/Lall yearE01
Solids, total suspendeddaily maximum≤ 30 mg/Lall yearE01
Solids, total suspended30-day average≤ 30 mg/Lall yearE01
Solids, total suspendeddaily maximum≤ 100 mg/Lall yearE01
Oil & Grease30-day average≤ 15 mg/Lall yearE01
Oil & 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 yearG01
Solids, total suspendeddaily maximum≤ 30 mg/Lall yearG01
Oil & Grease30-day average≤ 15 mg/Lall yearG01
Oil & Greasedaily maximum≤ 20 mg/Lall yearG01
Chromium, hexavalent [as Cr]30-day average≤ .1 mg/Lall yearG01
Chromium, hexavalent [as Cr]daily maximum≤ .2 mg/Lall yearG01
Chromium, total [as Cr]30-day average≤ 1 mg/Lall yearG01
Chromium, total [as Cr]daily maximum≤ 2 mg/Lall yearG01
Copper, total [as Cu]30-day average≤ .5 mg/Lall yearG01
Copper, total [as Cu]daily maximum≤ 1 mg/Lall yearG01
Iron, total [as Fe]daily maximum≤ 1 mg/Lall yearG01
Lead, total [as Pb]30-day average≤ .2 mg/Lall yearG01
Lead, total [as Pb]daily maximum≤ .4 mg/Lall yearG01
Nickel, total [as Ni]30-day average≤ 1 mg/Lall yearG01
Nickel, total [as Ni]daily maximum≤ 2 mg/Lall yearG01
Zinc, total [as Zn]30-day average≤ 1 mg/Lall yearG01
Zinc, total [as Zn]daily maximum≤ 2 mg/Lall yearG01
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearG01
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearG01

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/IL0048313 · MCP: https://passage-data.com/mcp