WALNUT CREEK MINE
NPDES ID: MO0139912
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: 14 effluent violations.
Violations
June 30, 2026
Solids, settleable
280% over limit
Discharged 0.00019 mg/L against a permitted limit of 0.00005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Iron, total recoverable
105% over limit
Discharged 6.16000029 mg/L against a permitted limit of 3.00000014 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Iron, total recoverable
3% over limit
Discharged 6.16000029 mg/L against a permitted limit of 6.00000028 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
May 31, 2026
Solids, total suspended
176% over limit
Discharged 96.7 mg/L against a permitted limit of 35 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Iron, total recoverable
97% over limit
Discharged 5.92000028 mg/L against a permitted limit of 3.00000014 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
38% over limit
Discharged 96.7 mg/L against a permitted limit of 70 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
53% over limit
Discharged 53.6 mg/L against a permitted limit of 35 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, settleable
300% over limit
Discharged 0.0002 mg/L against a permitted limit of 0.00005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2026
Solids, total suspended
23% over limit
Discharged 42.9 mg/L against a permitted limit of 35 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Iron, total recoverable
28% over limit
Discharged 3.84000018 mg/L against a permitted limit of 3.00000014 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Iron, total recoverable
440% over limit
Discharged 16.20000077 mg/L against a permitted limit of 3.00000014 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Iron, total recoverable
19% over limit
Discharged 3.58000017 mg/L against a permitted limit of 3.00000014 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, settleable
300% over limit
Discharged 0.0002 mg/L against a permitted limit of 0.00005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Iron, total recoverable
170% over limit
Discharged 16.20000077 mg/L against a permitted limit of 6.00000028 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2025
Solids, total suspended
16% over limit
Discharged 40.6 mg/L against a permitted limit of 35 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 16, 2026 (1 hour ago)