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Knight Hawk Coal LLC

Bituminous Coal - Underground, Percy, Illinois. NPDES permit IL0080064 expired Feb 29, 2020; its limits still apply. Last 12 months: over a limit 3 times (last April 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: form 1 quarterly (16 values), form 2 quarterly (8 values), form 3 quarterly (7 values), form 4 quarterly (16 values), form S twice a year
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 34 reports late

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

Period endingParameterReportedLimitOver by
November 2025Solids, total suspended, 30-day average48 mg/L≤ 35 mg/L37%
March 2026Solids, total suspended, 30-day average56 mg/L≤ 35 mg/L60%
April 2026Solids, total suspended, 30-day average55 mg/L≤ 35 mg/L57%

Limits in force (75)

ParameterStatisticLimitMonths
pHminimum≥ 6.5 SUall year
pHquarterly minimum≥ 6 SUall year
pHquarterly minimum≥ 6 SUall year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
pHquarterly maximum≤ 9 SUall year
pHquarterly maximum≤ 9 SUall year
pHmaximum≤ 9 SUall year
Alkalinity, total [as CaCO3]daily maximumreport only (mg/L)all year
Alkalinity, total [as CaCO3]daily maximumreport only (mg/L)all year
Acidity, total [as CaCO3]daily maximumreport only (mg/L)all year
Acidity, total [as CaCO3]daily maximumreport only (mg/L)all year
Solids, total suspended30-day average≤ 35 mg/Lall year
Solids, total suspended30-day average≤ 35 mg/Lall year
Solids, total suspendeddaily maximum≤ 70 mg/Lall year
Solids, total suspendeddaily maximum≤ 70 mg/Lall year
Solids, settleablequarterly maximum≤ .5 mL/Lall year
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year
Hardness, total [as CaCO3]quarterly maximumreport only (mg/L)all year
Hardness, total [as CaCO3]quarterly maximumreport only (mg/L)all year
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year
Chloride [as Cl]daily maximum≤ 500 mg/Lall year
Chloride [as Cl]quarterly maximum≤ 500 mg/Lall year
Chloride [as Cl]quarterly maximum≤ 500 mg/Lall year
Chloride [as Cl]daily maximum≤ 500 mg/Lall year
Sulfate, total [as SO4]daily maximum≤ 2194 mg/Lall year
Sulfate, total [as SO4]quarterly maximum≤ 2194 mg/Lall year
Sulfate, total [as SO4]quarterly maximum≤ 2194 mg/Lall year
Sulfate, total [as SO4]daily maximum≤ 2194 mg/Lall year
Arsenic, total [as As]daily maximumreport only (mg/L)all year
Arsenic, total [as As]daily maximumreport only (mg/L)all year
Barium, total [as Ba]daily maximumreport only (mg/L)all year
Barium, total [as Ba]daily maximumreport only (mg/L)all year
Cadmium, total [as Cd]daily maximumreport only (mg/L)all year
Cadmium, total [as Cd]daily maximumreport only (mg/L)all year
Chromium, hexavalent [as Cr]daily maximumreport only (mg/L)all year
Chromium, hexavalent [as Cr]daily maximumreport only (mg/L)all year
Chromium, total [as Cr]daily maximumreport only (mg/L)all year
Chromium, total [as Cr]daily maximumreport only (mg/L)all year
Copper, total [as Cu]daily maximumreport only (mg/L)all year
Copper, total [as Cu]daily maximumreport only (mg/L)all year
Iron, total [as Fe]30-day average≤ 3 mg/Lall year
Iron, total [as Fe]30-day average≤ 3 mg/Lall year
Iron, total [as Fe]daily maximum≤ 6 mg/Lall year
Iron, total [as Fe]daily maximum≤ 6 mg/Lall year
Lead, total [as Pb]daily maximumreport only (mg/L)all year
Lead, total [as Pb]daily maximumreport only (mg/L)all year
Manganese, total [as Mn]30-day average≤ 2 mg/Lall year
Manganese, total [as Mn]30-day average≤ 2 mg/Lall year
Manganese, total [as Mn]daily maximum≤ 4 mg/Lall year
Manganese, total [as Mn]daily maximum≤ 4 mg/Lall year
Manganese, total [as Mn]daily maximumreport only (mg/L)all year
Manganese, total [as Mn]daily maximumreport only (mg/L)all year
Nickel, total [as Ni]daily maximumreport only (mg/L)all year
Nickel, total [as Ni]daily maximumreport only (mg/L)all year
Silver, total [as Ag]daily maximumreport only (mg/L)all year
Silver, total [as Ag]daily maximumreport only (mg/L)all year
Zinc, total [as Zn]daily maximumreport only (mg/L)all year
Zinc, total [as Zn]daily maximumreport only (mg/L)all year
Selenium, total [as Se]daily maximumreport only (ug/L)all year
Selenium, total [as Se]daily maximumreport only (ug/L)all year
Phenolics, total recoverabledaily maximumreport only (mg/L)all year
Phenolics, total recoverabledaily maximumreport only (mg/L)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Mercury, total [as Hg]daily maximumreport only (ng/L)all year
Mercury, total [as Hg]daily maximumreport only (ng/L)all year
Mercury, total [as Hg]daily maximumreport only (ng/L)all year
Mercury, total [as Hg]daily maximumreport only (ng/L)all year

How strict are these limits?

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

Same industry: the 56 Coal Mining 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/IL0080064 · MCP: https://passage-data.com/mcp