NPDES ID: INP000709
X — SNC: Effluent violation (non-monthly average limit)
The facility discharged more of a pollutant than its permit allows, measured over a period other than a monthly average.
This quarter: 2 effluent violations.
Violations
May 31, 2026
Zinc, total recoverable
51% over limit
Discharged 1.51 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2026
Zinc, total recoverable
789% over limit
Discharged 8.89 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2026
Zinc, total recoverable
1440% over limit
Discharged 15.4 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2026
Zinc, total recoverable
128% over limit
Discharged 2.28 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Oil and grease, hexane extr method
43% over limit
Discharged 143 mg/L against a permitted limit of 100 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2026
Zinc, total recoverable
869% over limit
Discharged 9.69 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2025
Zinc, total recoverable
173% over limit
Discharged 2.73 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 6.14 SU against a permitted limit of 5.5 SU (DAILY MN)
DMR, Limited - Overdue
pH
0% over limit
Discharged 8.82 SU against a permitted limit of 9.5 SU (DAILY MX)
DMR, Limited - Overdue
November 30, 2025
pH
0% over limit
Discharged 6.25 SU against a permitted limit of 5.5 SU (DAILY MN)
DMR, Limited - Overdue
pH
0% over limit
Discharged 8.72 SU against a permitted limit of 9.5 SU (DAILY MX)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.014 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
Zinc, total recoverable
3480% over limit
Discharged 35.8 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2025
pH
0% over limit
Discharged 6.15 SU against a permitted limit of 5.5 SU (DAILY MN)
DMR, Limited - Overdue
September 30, 2025
pH
0% over limit
Discharged 6.45 SU against a permitted limit of 5.5 SU (DAILY MN)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.022 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 8.62 SU against a permitted limit of 9.5 SU (DAILY MX)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.042 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
August 31, 2025
pH
0% over limit
Discharged 6.2 SU against a permitted limit of 5.5 SU (DAILY MN)
DMR, Limited - Overdue
pH
0% over limit
Discharged 8.28 SU against a permitted limit of 9.5 SU (DAILY MX)
DMR, Limited - Overdue
Zinc, total recoverable
4240% over limit
Discharged 43.4 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
July 31, 2025
pH
0% over limit
Discharged 6.03 SU against a permitted limit of 5.5 SU (DAILY MN)
DMR, Limited - Overdue
Zinc, total recoverable
892% over limit
Discharged 9.92 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
June 30, 2025
Zinc, total recoverable
856% over limit
Discharged 9.56 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 5.82 SU against a permitted limit of 5.5 SU (DAILY MN)
DMR, Limited - Overdue
May 31, 2025
pH
0% over limit
Discharged 5.64 SU against a permitted limit of 5.5 SU (DAILY MN)
DMR, Limited - Overdue
Zinc, total recoverable
150% over limit
Discharged 2.5 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2025
Zinc, total recoverable
501% over limit
Discharged 6.01 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 8.68 SU against a permitted limit of 9.5 SU (DAILY MX)
DMR, Limited - Overdue
pH
0% over limit
Discharged 6.01 SU against a permitted limit of 5.5 SU (DAILY MN)
DMR, Limited - Overdue
March 31, 2025
pH
0% over limit
Discharged 5.47 SU against a permitted limit of 5.5 SU (DAILY MN)
DMR, Limited - Overdue
pH
0% over limit
Discharged 5.47 SU against a permitted limit of 5.5 SU (DAILY MN)
DMR, Limited - Numeric Violation
Zinc, total recoverable
698% over limit
Discharged 7.98 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2025
pH
0% over limit
Discharged 9.35 SU against a permitted limit of 9.5 SU (DAILY MX)
DMR, Limited - Overdue
Zinc, total recoverable
846% over limit
Discharged 9.46 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2025
pH
0% over limit
Discharged 6.1 SU against a permitted limit of 5.5 SU (DAILY MN)
DMR, Limited - Overdue
Zinc, total recoverable
744% over limit
Discharged 8.44 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.008 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 8.61 SU against a permitted limit of 9.5 SU (DAILY MX)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.005 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
December 31, 2024
Oil and grease, hexane extr method
19% over limit
Discharged 119 mg/L against a permitted limit of 100 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 3.64 SU against a permitted limit of 5.5 SU (DAILY MN)
DMR, Limited - Numeric Violation
Zinc, total recoverable
147% over limit
Discharged 2.47 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2024
Zinc, total recoverable
96% over limit
Discharged 1.96 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 4.64 SU against a permitted limit of 5.5 SU (DAILY MN)
DMR, Limited - Numeric Violation
October 31, 2024
Zinc, total recoverable
13500% over limit
Discharged 136 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 3.82 SU against a permitted limit of 5.5 SU (DAILY MN)
DMR, Limited - Numeric Violation
September 30, 2024
Zinc, total recoverable
463% over limit
Discharged 5.63 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 4.17 SU against a permitted limit of 5.5 SU (DAILY MN)
DMR, Limited - Numeric Violation
August 31, 2024
Zinc, total recoverable
344% over limit
Discharged 4.44 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 4.47 SU against a permitted limit of 5.5 SU (DAILY MN)
DMR, Limited - Numeric Violation
July 31, 2024
pH
0% over limit
Discharged 5.28 SU against a permitted limit of 5.5 SU (DAILY MN)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)