MADISON MINE
NPDES ID: MO0098752
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: 33 effluent violations, 2 single-event violations.
Violations
June 30, 2026
Solids, total suspended
97% over limit
Discharged 59 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
53% over limit
Discharged 46 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nickel, total recoverable
2525% over limit
Discharged 1.31000006 mg/L against a permitted limit of 0.0499 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
31% over limit
Discharged 59 mg/L against a permitted limit of 45 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Toxicity [acute], Ceriodaphnia dubia
Limit violation
Discharged 16 toxic against a permitted limit of 0.3 toxic (VALUE)
DMR, Limited - Numeric Violation
Copper, total recoverable
71% over limit
Discharged 0.0096 mg/L against a permitted limit of 0.0056 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (5 months ago)
Last confirmed
September 15, 2026 (5 days ago)