WILLIAMSON ENERGY LLC
NPDES ID: IL0077666
D — SNC: Discharge monitoring report not received
The facility didn't submit its required discharge monitoring report.
Violations
March 31, 2026
Solids, total suspended
20% over limit
Discharged 84 mg/L against a permitted limit of 70 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2025
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0055 mg/L (MO AVG)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0105 mg/L (MO AVG)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0126 mg/L (MO AVG)
DMR, Limited - Overdue
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0046 mg/L (MO AVG)
DMR, Limited - Overdue
November 30, 2025
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0046 mg/L (MO AVG)
DMR, Limited - Overdue
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0055 mg/L (MO AVG)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0126 mg/L (MO AVG)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0105 mg/L (MO AVG)
DMR, Limited - Overdue
October 31, 2025
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0126 mg/L (MO AVG)
DMR, Limited - Overdue
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0055 mg/L (MO AVG)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0105 mg/L (MO AVG)
DMR, Limited - Overdue
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0046 mg/L (MO AVG)
DMR, Limited - Overdue
Solids, total suspended
17% over limit
Discharged 82 mg/L against a permitted limit of 70 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2025
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0055 mg/L (MO AVG)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0105 mg/L (MO AVG)
DMR, Limited - Overdue
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0046 mg/L (MO AVG)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0126 mg/L (MO AVG)
DMR, Limited - Overdue
August 31, 2025
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0126 mg/L (MO AVG)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0105 mg/L (MO AVG)
DMR, Limited - Overdue
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0055 mg/L (MO AVG)
DMR, Limited - Overdue
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0046 mg/L (MO AVG)
DMR, Limited - Overdue
July 31, 2025
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0126 mg/L (MO AVG)
DMR, Limited - Overdue
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0055 mg/L (MO AVG)
DMR, Limited - Overdue
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0046 mg/L (MO AVG)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0105 mg/L (MO AVG)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
28% over limit
Discharged 2.18 mg/L against a permitted limit of 1.7 mg/L (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0105 mg/L (MO AVG)
DMR, Limited - Overdue
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0055 mg/L (MO AVG)
DMR, Limited - Overdue
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0046 mg/L (MO AVG)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0126 mg/L (MO AVG)
DMR, Limited - Overdue
May 31, 2025
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0105 mg/L (MO AVG)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0126 mg/L (MO AVG)
DMR, Limited - Overdue
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0046 mg/L (MO AVG)
DMR, Limited - Overdue
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0055 mg/L (MO AVG)
DMR, Limited - Overdue
April 30, 2025
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0046 mg/L (MO AVG)
DMR, Limited - Overdue
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0055 mg/L (MO AVG)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0105 mg/L (MO AVG)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0126 mg/L (MO AVG)
DMR, Limited - Overdue
March 31, 2025
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0055 mg/L (MO AVG)
DMR, Limited - Overdue
Sulfate, total [as SO4]
0% over limit
Discharged 0 mg/L against a permitted limit of 500 mg/L (DAILY MX)
DMR, Limited - Overdue
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0046 mg/L (MO AVG)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0105 mg/L (MO AVG)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0126 mg/L (MO AVG)
DMR, Limited - Overdue
February 28, 2025
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0046 mg/L (MO AVG)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0105 mg/L (MO AVG)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0126 mg/L (MO AVG)
DMR, Limited - Overdue
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0055 mg/L (MO AVG)
DMR, Limited - Overdue
Sulfate, total [as SO4]
0% over limit
Discharged 0 mg/L against a permitted limit of 500 mg/L (DAILY MX)
DMR, Limited - Overdue
January 31, 2025
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0046 mg/L (MO AVG)
DMR, Limited - Overdue
Sulfate, total [as SO4]
0% over limit
Discharged 0 mg/L against a permitted limit of 500 mg/L (DAILY MX)
DMR, Limited - Overdue
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0055 mg/L (MO AVG)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0105 mg/L (MO AVG)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0126 mg/L (MO AVG)
DMR, Limited - Overdue
December 31, 2024
Sulfate, total [as SO4]
0% over limit
Discharged 0 mg/L against a permitted limit of 500 mg/L (DAILY MX)
DMR, Limited - Overdue
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0046 mg/L (MO AVG)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0105 mg/L (MO AVG)
DMR, Limited - Overdue
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0055 mg/L (MO AVG)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0126 mg/L (MO AVG)
DMR, Limited - Overdue
November 30, 2024
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0105 mg/L (MO AVG)
DMR, Limited - Overdue
Sulfate, total [as SO4]
0% over limit
Discharged 0 mg/L against a permitted limit of 500 mg/L (DAILY MX)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0126 mg/L (MO AVG)
DMR, Limited - Overdue
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0046 mg/L (MO AVG)
DMR, Limited - Overdue
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0055 mg/L (MO AVG)
DMR, Limited - Overdue
October 31, 2024
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0055 mg/L (MO AVG)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0126 mg/L (MO AVG)
DMR, Limited - Overdue
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0046 mg/L (MO AVG)
DMR, Limited - Overdue
Sulfate, total [as SO4]
0% over limit
Discharged 0 mg/L against a permitted limit of 500 mg/L (DAILY MX)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0105 mg/L (MO AVG)
DMR, Limited - Overdue
September 30, 2024
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0046 mg/L (MO AVG)
DMR, Limited - Overdue
Sulfate, total [as SO4]
0% over limit
Discharged 0 mg/L against a permitted limit of 500 mg/L (DAILY MX)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0105 mg/L (MO AVG)
DMR, Limited - Overdue
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0055 mg/L (MO AVG)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0126 mg/L (MO AVG)
DMR, Limited - Overdue
August 31, 2024
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0055 mg/L (MO AVG)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0126 mg/L (MO AVG)
DMR, Limited - Overdue
Nickel, dissolved [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0046 mg/L (MO AVG)
DMR, Limited - Overdue
Sulfate, total [as SO4]
0% over limit
Discharged 0 mg/L against a permitted limit of 500 mg/L (DAILY MX)
DMR, Limited - Overdue
Copper, dissolved [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0105 mg/L (MO AVG)
DMR, Limited - Overdue
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 15, 2026 (11 hours ago)