CYPRUS MINES
NPDES ID: MDG490361
X — SNC: Effluent violation (non-monthly average limit)
The facility discharged more of a pollutant than its permit allows, measured over a period other than a monthly average.
This quarter: 6 effluent violations.
Violations
June 30, 2026
Solids, total suspended
102% over limit
Discharged 60.67 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 8.9 SU against a permitted limit of 8.5 SU (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
23% over limit
Discharged 74 mg/L against a permitted limit of 60 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
May 31, 2026
Solids, total suspended
146% over limit
Discharged 73.85 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 9 SU against a permitted limit of 8.5 SU (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
55% over limit
Discharged 93 mg/L against a permitted limit of 60 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2025
Solids, total suspended
12% over limit
Discharged 33.5 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
September 30, 2025
Solids, total suspended
135% over limit
Discharged 70.5 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Solids, total suspended
118% over limit
Discharged 131 mg/L against a permitted limit of 60 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2025
Solids, total suspended
46% over limit
Discharged 43.75 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
July 31, 2025
Solids, total suspended
50% over limit
Discharged 90 mg/L against a permitted limit of 60 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 8.64 SU against a permitted limit of 8.5 SU (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
85% over limit
Discharged 55.5 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 15, 2026 (4 hours ago)