BLACKS RUN SITE
NPDES ID: PA0218537
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, 22 reporting violations.
Violations
April 30, 2026
Cyanide, free available
482% over limit
Discharged 0.0291 mg/L against a permitted limit of 0.005 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Cyanide, free available
352% over limit
Discharged 0.0407 mg/L against a permitted limit of 0.009 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Selenium, total [as Se]
56% over limit
Discharged 0.0078 mg/L against a permitted limit of 0.005 mg/L (MO AVG)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 9.6 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Numeric Violation
March 31, 2026
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
Lead, total [as Pb]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
Zinc, total [as Zn]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Chromium, hexavalent [as Cr]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Boron, total [as B]
0% over limit
Discharged 0 mg/L against a permitted limit of 2.64 mg/L (DAILY MX)
DMR, Limited - Overdue
Cyanide, free available
0% over limit
Discharged 0 mg/L against a permitted limit of 0.005 mg/L (MO AVG)
DMR, Limited - Overdue
Selenium, total [as Se]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.008 mg/L (DAILY MX)
DMR, Limited - Overdue
Arsenic, total [as As]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Cyanide, free available
0% over limit
Discharged 0 mg/L against a permitted limit of 0.009 mg/L (DAILY MX)
DMR, Limited - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Overdue
Arsenic, total [as As]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Chromium, hexavalent [as Cr]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
Selenium, total [as Se]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.005 mg/L (MO AVG)
DMR, Limited - Overdue
Zinc, total [as Zn]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Boron, total [as B]
0% over limit
Discharged 0 mg/L against a permitted limit of 1.69 mg/L (MO AVG)
DMR, Limited - Overdue
Nickel, total [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Nickel, total [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 60 mg/L (DAILY MX)
DMR, Limited - Overdue
Lead, total [as Pb]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
February 28, 2026
Boron, total [as B]
8% over limit
Discharged 1.83 mg/L against a permitted limit of 1.69 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Selenium, total [as Se]
14% over limit
Discharged 0.0057 mg/L against a permitted limit of 0.005 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Cyanide, free available
167% over limit
Discharged 0.01335 mg/L against a permitted limit of 0.005 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Cyanide, free available
77% over limit
Discharged 0.0159 mg/L against a permitted limit of 0.009 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2026
Cyanide, free available
365% over limit
Discharged 0.02325 mg/L against a permitted limit of 0.005 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Selenium, total [as Se]
35% over limit
Discharged 0.00675 mg/L against a permitted limit of 0.005 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Cyanide, free available
210% over limit
Discharged 0.0279 mg/L against a permitted limit of 0.009 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 9.3 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Numeric Violation
December 31, 2025
Selenium, total [as Se]
29% over limit
Discharged 0.00645 mg/L against a permitted limit of 0.005 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Boron, total [as B]
21% over limit
Discharged 2.045 mg/L against a permitted limit of 1.69 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2025
Cyanide, free available
48% over limit
Discharged 0.0074 mg/L against a permitted limit of 0.005 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Boron, total [as B]
13% over limit
Discharged 1.91 mg/L against a permitted limit of 1.69 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Selenium, total [as Se]
17% over limit
Discharged 0.00585 mg/L against a permitted limit of 0.005 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Boron, total [as B]
33% over limit
Discharged 2.245 mg/L against a permitted limit of 1.69 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Boron, total [as B]
30% over limit
Discharged 2.2 mg/L against a permitted limit of 1.69 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Selenium, total [as Se]
60% over limit
Discharged 0.008 mg/L against a permitted limit of 0.005 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2025
pH
0% over limit
Discharged 9.2 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Numeric Violation
April 30, 2025
pH
0% over limit
Discharged 9.5 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Numeric Violation
March 31, 2025
pH
0% over limit
Discharged 9.2 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (4 days ago)