ECHO BAY MINERALS CO KEY PROJECT
NPDES ID: WA0991005
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: 2 effluent violations, 2 reporting violations.
Violations
May 31, 2026
Sulfide, total [as S]
263% over limit
Discharged 0.0696 mg/L against a permitted limit of 0.0192 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Solids, total dissolved
0% over limit
Discharged 0 mg/L against a permitted limit of 619.0000294 mg/L (MO AVG)
DMR, Limited - Overdue
Sulfide, total [as S]
63963% over limit
Discharged 12.30000058 mg/L against a permitted limit of 0.0192 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Solids, total dissolved
0% over limit
Discharged 0 mg/L against a permitted limit of 619.0000294 mg/L (MO AVG)
DMR, Limited - Overdue
Sulfide, total [as S]
1270733% over limit
Discharged 244.00001159 mg/L against a permitted limit of 0.0192 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Solids, total dissolved
0% over limit
Discharged 0 mg/L against a permitted limit of 619.0000294 mg/L (MO AVG)
DMR, Limited - Overdue
November 30, 2025
Solids, total dissolved
0% over limit
Discharged 0 mg/L against a permitted limit of 619.0000294 mg/L (MO AVG)
DMR, Limited - Overdue
October 31, 2025
Solids, total dissolved
0% over limit
Discharged 0 mg/L against a permitted limit of 619.0000294 mg/L (MO AVG)
DMR, Limited - Overdue
September 30, 2025
Solids, total dissolved
0% over limit
Discharged 0 mg/L against a permitted limit of 619.0000294 mg/L (MO AVG)
DMR, Limited - Overdue
August 31, 2025
Solids, total dissolved
0% over limit
Discharged 0 mg/L against a permitted limit of 619.0000294 mg/L (MO AVG)
DMR, Limited - Overdue
July 31, 2025
Solids, total dissolved
0% over limit
Discharged 0 mg/L against a permitted limit of 619.0000294 mg/L (MO AVG)
DMR, Limited - Overdue
June 30, 2025
Solids, total dissolved
0% over limit
Discharged 0 mg/L against a permitted limit of 619.0000294 mg/L (MO AVG)
DMR, Limited - Overdue
Sulfide, total [as S]
473% over limit
Discharged 0.11000001 mg/L against a permitted limit of 0.0192 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Solids, total dissolved
0% over limit
Discharged 0 mg/L against a permitted limit of 619.0000294 mg/L (MO AVG)
DMR, Limited - Overdue
April 30, 2025
Solids, total dissolved
0% over limit
Discharged 0 mg/L against a permitted limit of 619.0000294 mg/L (MO AVG)
DMR, Limited - Overdue
March 31, 2025
Solids, total dissolved
0% over limit
Discharged 0 mg/L against a permitted limit of 619.0000294 mg/L (MO AVG)
DMR, Limited - Overdue
Sulfide, total [as S]
442% over limit
Discharged 0.104 mg/L against a permitted limit of 0.0192 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Solids, total dissolved
0% over limit
Discharged 0 mg/L against a permitted limit of 619.0000294 mg/L (MO AVG)
DMR, Limited - Overdue
October 31, 2024
Solids, total dissolved
0% over limit
Discharged 0 mg/L against a permitted limit of 619.0000294 mg/L (MO AVG)
DMR, Limited - Overdue
September 30, 2024
Solids, total dissolved
0% over limit
Discharged 0 mg/L against a permitted limit of 619.0000294 mg/L (MO AVG)
DMR, Limited - Overdue
August 31, 2024
Solids, total dissolved
0% over limit
Discharged 0 mg/L against a permitted limit of 619.0000294 mg/L (MO AVG)
DMR, Limited - Overdue
July 31, 2024
Solids, total dissolved
0% over limit
Discharged 0 mg/L against a permitted limit of 619.0000294 mg/L (MO AVG)
DMR, Limited - Overdue
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (25 days ago)