SIXTEEN TO ONE MINE
NPDES ID: CA0081809
S — SNC: Compliance schedule violation
The facility missed a deadline in its compliance schedule by more than 90 days.
This quarter: 7 effluent violations, 2 compliance schedule violations.
Violations
June 30, 2026
Nickel, total recoverable
31% over limit
Discharged 0.0588 mg/L against a permitted limit of 0.045 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Iron, total recoverable
80% over limit
Discharged 1.06000005 mg/L against a permitted limit of 0.59000003 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Arsenic, total recoverable
3636% over limit
Discharged 0.82200004 mg/L against a permitted limit of 0.022 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Antimony, total recoverable
187% over limit
Discharged 0.0316 mg/L against a permitted limit of 0.011 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Iron, total recoverable
38% over limit
Discharged 1.06000005 mg/L against a permitted limit of 0.77000004 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Arsenic, total recoverable
8120% over limit
Discharged 0.82200004 mg/L against a permitted limit of 0.01 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (5 months ago)
Last confirmed
September 15, 2026 (5 days ago)