YELLOWSTONE ENERGY LIMITED PARTNERSHIP FACILITY
NPDES ID: MT0030180
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: 6 effluent violations.
Violations
June 30, 2026
Copper, total recoverable
360% over limit
Discharged 0.064 mg/L against a permitted limit of 0.01392 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
566% over limit
Discharged 0.0635 mg/L against a permitted limit of 0.00953 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2026
Copper, total recoverable
404% over limit
Discharged 0.048 mg/L against a permitted limit of 0.00953 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
561% over limit
Discharged 0.092 mg/L against a permitted limit of 0.01392 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2026
Copper, total recoverable
150% over limit
Discharged 0.0238 mg/L against a permitted limit of 0.00953 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
144% over limit
Discharged 0.034 mg/L against a permitted limit of 0.01392 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (5 months ago)
Last confirmed
September 15, 2026 (4 days ago)