KNIGHT HAWK COAL LLC
NPDES ID: IL0072745
E — SNC: Effluent violation (monthly average limit)
The facility discharged more of a pollutant than its permit allows, based on a monthly average.
This quarter: 4 effluent violations.
Violations
May 31, 2026
Solids, total suspended
286% over limit
Discharged 135 mg/L against a permitted limit of 35 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
93% over limit
Discharged 135 mg/L against a permitted limit of 70 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2026
Solids, total suspended
26% over limit
Discharged 44 mg/L against a permitted limit of 35 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
89% over limit
Discharged 66 mg/L against a permitted limit of 35 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Solids, total suspended
134% over limit
Discharged 82 mg/L against a permitted limit of 35 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
17% over limit
Discharged 82 mg/L against a permitted limit of 70 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
June 30, 2025
pH
0% over limit
Discharged 9.5 SU against a permitted limit of 9 SU (QRTR MAX)
DMR, Limited - Numeric Violation
May 31, 2025
Manganese, total [as Mn]
112% over limit
Discharged 4.238 mg/L against a permitted limit of 2 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Iron, total [as Fe]
0% over limit
Discharged 3.009 mg/L against a permitted limit of 3 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Manganese, total [as Mn]
6% over limit
Discharged 4.238 mg/L against a permitted limit of 4 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 9.7 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Numeric Violation
Iron, total [as Fe]
27% over limit
Discharged 3.795 mg/L against a permitted limit of 3 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Solids, total suspended
454% over limit
Discharged 194 mg/L against a permitted limit of 35 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
177% over limit
Discharged 194 mg/L against a permitted limit of 70 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2025
Solids, total suspended
20% over limit
Discharged 42 mg/L against a permitted limit of 35 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
October 31, 2024
Solids, total suspended
69% over limit
Discharged 59 mg/L against a permitted limit of 35 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Solids, total suspended
323% over limit
Discharged 296 mg/L against a permitted limit of 70 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Iron, total [as Fe]
52% over limit
Discharged 9.121 mg/L against a permitted limit of 6 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Iron, total [as Fe]
204% over limit
Discharged 9.121 mg/L against a permitted limit of 3 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
746% over limit
Discharged 296 mg/L against a permitted limit of 35 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 15, 2026 (4 hours ago)