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: 4 effluent violations.
Violations
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
March 31, 2026
Copper, total recoverable
813% over limit
Discharged 0.087 mg/L against a permitted limit of 0.00953 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
1100% over limit
Discharged 0.16700001 mg/L against a permitted limit of 0.01392 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2026
Copper, total recoverable
341% over limit
Discharged 0.042 mg/L against a permitted limit of 0.00953 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
503% over limit
Discharged 0.084 mg/L against a permitted limit of 0.01392 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2026
Copper, total recoverable
834% over limit
Discharged 0.13000001 mg/L against a permitted limit of 0.01392 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
918% over limit
Discharged 0.097 mg/L against a permitted limit of 0.00953 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Copper, total recoverable
582% over limit
Discharged 0.065 mg/L against a permitted limit of 0.00953 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
611% over limit
Discharged 0.099 mg/L against a permitted limit of 0.01392 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2025
Copper, total recoverable
572% over limit
Discharged 0.064 mg/L against a permitted limit of 0.00953 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
1150% over limit
Discharged 0.17400001 mg/L against a permitted limit of 0.01392 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2025
Copper, total recoverable
525% over limit
Discharged 0.087 mg/L against a permitted limit of 0.01392 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
383% over limit
Discharged 0.046 mg/L against a permitted limit of 0.00953 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Copper, total recoverable
131% over limit
Discharged 0.022 mg/L against a permitted limit of 0.00953 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
65% over limit
Discharged 0.023 mg/L against a permitted limit of 0.01392 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2025
Copper, total recoverable
362% over limit
Discharged 0.044 mg/L against a permitted limit of 0.00953 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
345% over limit
Discharged 0.062 mg/L against a permitted limit of 0.01392 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
July 31, 2025
Copper, total recoverable
393% over limit
Discharged 0.047 mg/L against a permitted limit of 0.00953 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
460% over limit
Discharged 0.078 mg/L against a permitted limit of 0.01392 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
June 30, 2025
Copper, total recoverable
1286% over limit
Discharged 0.19300001 mg/L against a permitted limit of 0.01392 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
1306% over limit
Discharged 0.13400001 mg/L against a permitted limit of 0.00953 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Copper, total recoverable
1054% over limit
Discharged 0.11000001 mg/L against a permitted limit of 0.00953 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
906% over limit
Discharged 0.14000001 mg/L against a permitted limit of 0.01392 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2025
Copper, total recoverable
2486% over limit
Discharged 0.36000002 mg/L against a permitted limit of 0.01392 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
756% over limit
Discharged 0.0816 mg/L against a permitted limit of 0.00953 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Copper, total recoverable
1049% over limit
Discharged 0.16000001 mg/L against a permitted limit of 0.01392 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
1086% over limit
Discharged 0.11300001 mg/L against a permitted limit of 0.00953 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Copper, total recoverable
624% over limit
Discharged 0.069 mg/L against a permitted limit of 0.00953 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
582% over limit
Discharged 0.095 mg/L against a permitted limit of 0.01392 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2025
Copper, total recoverable
920% over limit
Discharged 0.14200001 mg/L against a permitted limit of 0.01392 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
970% over limit
Discharged 0.102 mg/L against a permitted limit of 0.00953 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2024
Copper, total recoverable
992% over limit
Discharged 0.15200001 mg/L against a permitted limit of 0.01392 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
981% over limit
Discharged 0.103 mg/L against a permitted limit of 0.00953 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Zinc, total recoverable
202% over limit
Discharged 0.53800003 mg/L against a permitted limit of 0.17800001 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
635% over limit
Discharged 0.07 mg/L against a permitted limit of 0.00953 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Zinc, total recoverable
43% over limit
Discharged 0.16600001 mg/L against a permitted limit of 0.11600001 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
762% over limit
Discharged 0.12000001 mg/L against a permitted limit of 0.01392 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2024
Copper, total recoverable
1121% over limit
Discharged 0.17000001 mg/L against a permitted limit of 0.01392 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
876% over limit
Discharged 0.093 mg/L against a permitted limit of 0.00953 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Copper, total recoverable
1495% over limit
Discharged 0.22200001 mg/L against a permitted limit of 0.01392 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
865% over limit
Discharged 0.092 mg/L against a permitted limit of 0.00953 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2024
Copper, total recoverable
173% over limit
Discharged 0.038 mg/L against a permitted limit of 0.01392 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (22 days ago)