NPDES ID: MS0003158
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: 10 effluent violations.
Violations
June 30, 2026
Nickel, total recoverable
109% over limit
Discharged 1.045 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nickel, total recoverable
72% over limit
Discharged 1.72 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nickel, total recoverable
175% over limit
Discharged 0.461264 kg/d against a permitted limit of 0.16798 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nickel, total recoverable
129% over limit
Discharged 0.75908799 kg/d against a permitted limit of 0.33142 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
May 31, 2026
Zinc, total recoverable
42% over limit
Discharged 0.238804 kg/d against a permitted limit of 0.16798 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nickel, total recoverable
165% over limit
Discharged 0.44492 kg/d against a permitted limit of 0.16798 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Zinc, total recoverable
42% over limit
Discharged 0.711 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nickel, total recoverable
36% over limit
Discharged 0.44946 kg/d against a permitted limit of 0.33142 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nickel, total recoverable
160% over limit
Discharged 1.3 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nickel, total recoverable
60% over limit
Discharged 1.6 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2026
Chromium, total recoverable
42% over limit
Discharged 0.709 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chromium, total recoverable
25% over limit
Discharged 1.25 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chromium, total recoverable
74% over limit
Discharged 0.29283 kg/d against a permitted limit of 0.16798 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Chromium, total recoverable
58% over limit
Discharged 0.523916 kg/d against a permitted limit of 0.33142 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2026
Iron, total recoverable
0% over limit
Discharged 0 kg/d against a permitted limit of 0.66283999 kg/d (MO AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 26 mg/L (MO AVG)
DMR, Limited - Overdue
Chromium, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0 kg/d against a permitted limit of 8.62599993 kg/d (MO AVG)
DMR, Limited - Overdue
Copper, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Overdue
Copper, total recoverable
0% over limit
Discharged 0 kg/d against a permitted limit of 0.16798 kg/d (MO AVG)
DMR, Limited - Overdue
Zinc, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Overdue
Chromium, total recoverable
0% over limit
Discharged 0 kg/d against a permitted limit of 0.16798 kg/d (MO AVG)
DMR, Limited - Overdue
Iron, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Overdue
Oil & Grease
0% over limit
Discharged 0 kg/d against a permitted limit of 8.62599993 kg/d (MO AVG)
DMR, Limited - Overdue
Zinc, total recoverable
0% over limit
Discharged 0 kg/d against a permitted limit of 0.16798 kg/d (MO AVG)
DMR, Limited - Overdue
Copper, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Overdue
Chromium, hexavalent [as Cr]
0% over limit
Discharged 0 kg/d against a permitted limit of 0.016798 kg/d (MO AVG)
DMR, Limited - Overdue
Oil & Grease
0% over limit
Discharged 0 kg/d against a permitted limit of 17.25199986 kg/d (DAILY MX)
DMR, Limited - Overdue
Nickel, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Overdue
Chromium, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Overdue
Copper, total recoverable
0% over limit
Discharged 0 kg/d against a permitted limit of 0.33142 kg/d (DAILY MX)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 45 mg/L (DAILY MX)
DMR, Limited - Overdue
Zinc, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Overdue
Zinc, total recoverable
0% over limit
Discharged 0 kg/d against a permitted limit of 0.33142 kg/d (DAILY MX)
DMR, Limited - Overdue
Chromium, total recoverable
0% over limit
Discharged 0 kg/d against a permitted limit of 0.33142 kg/d (DAILY MX)
DMR, Limited - Overdue
Oil & Grease
0% over limit
Discharged 0 mg/L against a permitted limit of 26 mg/L (MO AVG)
DMR, Limited - Overdue
Chromium, hexavalent [as Cr]
0% over limit
Discharged 0 kg/d against a permitted limit of 0.033142 kg/d (DAILY MX)
DMR, Limited - Overdue
Nickel, total recoverable
0% over limit
Discharged 0 kg/d against a permitted limit of 0.16798 kg/d (MO AVG)
DMR, Limited - Overdue
Nickel, total recoverable
0% over limit
Discharged 0 kg/d against a permitted limit of 0.33142 kg/d (DAILY MX)
DMR, Limited - Overdue
Chromium, hexavalent [as Cr]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.1 mg/L (DAILY MX)
DMR, Limited - Overdue
Iron, total recoverable
0% over limit
Discharged 0 kg/d against a permitted limit of 1.32567999 kg/d (DAILY MX)
DMR, Limited - Overdue
Chromium, hexavalent [as Cr]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.05 mg/L (MO AVG)
DMR, Limited - Overdue
Nickel, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Overdue
Oil & Grease
0% over limit
Discharged 0 mg/L against a permitted limit of 52 mg/L (DAILY MX)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0 kg/d against a permitted limit of 14.93659987 kg/d (DAILY MX)
DMR, Limited - Overdue
Iron, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 4 mg/L (DAILY MX)
DMR, Limited - Overdue
December 31, 2025
Lead, total recoverable
0% over limit
Discharged 0 kg/d against a permitted limit of 0.10896 kg/d (MX MO AV)
DMR, Limited - Overdue
Aluminum, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 4 mg/L (ANNL MAX)
DMR, Limited - Overdue
Chromium, hexavalent [as Cr]
0% over limit
Discharged 0.1 mg/L against a permitted limit of 0.1 mg/L (DAILY MX)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 11.5 mg/L against a permitted limit of 26 mg/L (MO AVG)
DMR, Limited - Overdue
Chromium, hexavalent [as Cr]
26% over limit
Discharged 0.041768 kg/d against a permitted limit of 0.033142 kg/d (DAILY MX)
DMR, Limited - Overdue
Chromium, hexavalent [as Cr]
26% over limit
Discharged 0.041768 kg/d against a permitted limit of 0.033142 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Zinc, total recoverable
0% over limit
Discharged 0.181146 kg/d against a permitted limit of 0.33142 kg/d (DAILY MX)
DMR, Limited - Overdue
Iron, total recoverable
0% over limit
Discharged 1.08505999 kg/d against a permitted limit of 1.32567999 kg/d (DAILY MX)
DMR, Limited - Overdue
Cyanide, total [as CN]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.65 mg/L (MX MO AV)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 4.60809996 kg/d against a permitted limit of 8.62599993 kg/d (MO AVG)
DMR, Limited - Overdue
Chromium, hexavalent [as Cr]
24% over limit
Discharged 0.020884 kg/d against a permitted limit of 0.016798 kg/d (MO AVG)
DMR, Limited - Overdue
Chromium, hexavalent [as Cr]
24% over limit
Discharged 0.020884 kg/d against a permitted limit of 0.016798 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Total toxic organics [TTO] [40 CFR433]
0% over limit
Discharged 0 kg/d against a permitted limit of 0.70823999 kg/d (ANNL MAX)
DMR, Limited - Overdue
Iron, total recoverable
13% over limit
Discharged 2.25 mg/L against a permitted limit of 2 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nickel, total recoverable
79% over limit
Discharged 0.301456 kg/d against a permitted limit of 0.16798 kg/d (MO AVG)
DMR, Limited - Overdue
Nickel, total recoverable
79% over limit
Discharged 0.301456 kg/d against a permitted limit of 0.16798 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Chromium, total recoverable
0% over limit
Discharged 0.253786 kg/d against a permitted limit of 0.33142 kg/d (DAILY MX)
DMR, Limited - Overdue
Lead, total recoverable
0% over limit
Discharged 0 kg/d against a permitted limit of 0.227 kg/d (DAILY MX)
DMR, Limited - Overdue
Aluminum, total recoverable
0% over limit
Discharged 0 kg/d against a permitted limit of 1.32567999 kg/d (ANNL MAX)
DMR, Limited - Overdue
Nickel, total recoverable
22% over limit
Discharged 1.22 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
0% over limit
Discharged 0 kg/d against a permitted limit of 1.32567999 kg/d (ANNL MAX)
DMR, Limited - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 0 mg/L against a permitted limit of 4 mg/L (ANNL MAX)
DMR, Limited - Overdue
Cyanide, total [as CN]
0% over limit
Discharged 0 mg/L against a permitted limit of 1.2 mg/L (DAILY MX)
DMR, Limited - Overdue
Iron, total recoverable
0% over limit
Discharged 0.63105999 kg/d against a permitted limit of 0.66283999 kg/d (MO AVG)
DMR, Limited - Overdue
Lead, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 0.69 mg/L (DAILY MX)
DMR, Limited - Overdue
Chromium, total recoverable
0% over limit
Discharged 0.398 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Overdue
Chromium, total recoverable
0% over limit
Discharged 0.159808 kg/d against a permitted limit of 0.16798 kg/d (MO AVG)
DMR, Limited - Overdue
Zinc, total recoverable
0% over limit
Discharged 0.133476 kg/d against a permitted limit of 0.16798 kg/d (MO AVG)
DMR, Limited - Overdue
Aluminum, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 2 mg/L (ANNL AVG)
DMR, Limited - Overdue
Iron, total recoverable
72% over limit
Discharged 1.717 mg/L against a permitted limit of 1 mg/L (QRTR AVG)
DMR, Limited - Numeric Violation
Aluminum, total recoverable
0% over limit
Discharged 0 kg/d against a permitted limit of 0.66283999 kg/d (ANNL AVG)
DMR, Limited - Overdue
Nickel, total recoverable
50% over limit
Discharged 0.751 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Overdue
Nickel, total recoverable
50% over limit
Discharged 0.751 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Cyanide, total [as CN]
0% over limit
Discharged 0 kg/d against a permitted limit of 0.39952 kg/d (DAILY MX)
DMR, Limited - Overdue
Nickel, total recoverable
47% over limit
Discharged 0.48578 kg/d against a permitted limit of 0.33142 kg/d (DAILY MX)
DMR, Limited - Overdue
Nickel, total recoverable
47% over limit
Discharged 0.48578 kg/d against a permitted limit of 0.33142 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Iron, total recoverable
0% over limit
Discharged 1.57 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Overdue
Zinc, total recoverable
0% over limit
Discharged 0.331 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 9 mg/L against a permitted limit of 6 mg/L (MINIMUM)
DMR, Limited - Overdue
Total toxic organics [TTO] [40 CFR433]
0% over limit
Discharged 0 mg/L against a permitted limit of 2.13 mg/L (ANNL MAX)
DMR, Limited - Overdue
Cyanide, total [as CN]
0% over limit
Discharged 0 kg/d against a permitted limit of 0.21338 kg/d (MX MO AV)
DMR, Limited - Overdue
Chromium, hexavalent [as Cr]
0% over limit
Discharged 0.05 mg/L against a permitted limit of 0.05 mg/L (MO AVG)
DMR, Limited - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 0 mg/L against a permitted limit of 2 mg/L (ANNL AVG)
DMR, Limited - Overdue
Lead, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 0.33 mg/L (MX MO AV)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 7.96769993 kg/d against a permitted limit of 14.93659987 kg/d (DAILY MX)
DMR, Limited - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 0 kg/d against a permitted limit of 0.66283999 kg/d (ANNL AVG)
DMR, Limited - Overdue
November 30, 2025
Chromium, total recoverable
0% over limit
Discharged 0 kg/d against a permitted limit of 0.33142 kg/d (DAILY MX)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0 kg/d against a permitted limit of 14.93659987 kg/d (DAILY MX)
DMR, Limited - Overdue
Chromium, hexavalent [as Cr]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.1 mg/L (DAILY MX)
DMR, Limited - Overdue
Nickel, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Overdue
Oil & Grease
0% over limit
Discharged 0 mg/L against a permitted limit of 26 mg/L (MO AVG)
DMR, Limited - Overdue
Oil & Grease
0% over limit
Discharged 0 kg/d against a permitted limit of 17.25199986 kg/d (DAILY MX)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 45 mg/L (DAILY MX)
DMR, Limited - Overdue
Chromium, hexavalent [as Cr]
0% over limit
Discharged 0 kg/d against a permitted limit of 0.016798 kg/d (MO AVG)
DMR, Limited - Overdue
Copper, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Overdue
Copper, total recoverable
0% over limit
Discharged 0 kg/d against a permitted limit of 0.33142 kg/d (DAILY MX)
DMR, Limited - Overdue
Chromium, total recoverable
0% over limit
Discharged 0 kg/d against a permitted limit of 0.16798 kg/d (MO AVG)
DMR, Limited - Overdue
Zinc, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Overdue
Nickel, total recoverable
0% over limit
Discharged 0 kg/d against a permitted limit of 0.16798 kg/d (MO AVG)
DMR, Limited - Overdue
Iron, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Overdue
Zinc, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Overdue
Chromium, hexavalent [as Cr]
0% over limit
Discharged 0 kg/d against a permitted limit of 0.033142 kg/d (DAILY MX)
DMR, Limited - Overdue
Nickel, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Overdue
Chromium, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Overdue
Nickel, total recoverable
0% over limit
Discharged 0 kg/d against a permitted limit of 0.33142 kg/d (DAILY MX)
DMR, Limited - Overdue
Copper, total recoverable
0% over limit
Discharged 0 kg/d against a permitted limit of 0.16798 kg/d (MO AVG)
DMR, Limited - Overdue
Zinc, total recoverable
0% over limit
Discharged 0 kg/d against a permitted limit of 0.33142 kg/d (DAILY MX)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 26 mg/L (MO AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0 kg/d against a permitted limit of 8.62599993 kg/d (MO AVG)
DMR, Limited - Overdue
Iron, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 4 mg/L (DAILY MX)
DMR, Limited - Overdue
Zinc, total recoverable
0% over limit
Discharged 0 kg/d against a permitted limit of 0.16798 kg/d (MO AVG)
DMR, Limited - Overdue
Oil & Grease
0% over limit
Discharged 0 mg/L against a permitted limit of 52 mg/L (DAILY MX)
DMR, Limited - Overdue
Chromium, hexavalent [as Cr]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.05 mg/L (MO AVG)
DMR, Limited - Overdue
Chromium, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Overdue
Iron, total recoverable
0% over limit
Discharged 0 kg/d against a permitted limit of 0.66283999 kg/d (MO AVG)
DMR, Limited - Overdue
Oil & Grease
0% over limit
Discharged 0 kg/d against a permitted limit of 8.62599993 kg/d (MO AVG)
DMR, Limited - Overdue
Copper, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Overdue
Iron, total recoverable
0% over limit
Discharged 0 kg/d against a permitted limit of 1.32567999 kg/d (DAILY MX)
DMR, Limited - Overdue
September 30, 2025
pH
0% over limit
Discharged 4.4 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Numeric Violation
August 31, 2025
Nickel, total recoverable
5% over limit
Discharged 0.17706 kg/d against a permitted limit of 0.16798 kg/d (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Iron, total recoverable
32% over limit
Discharged 1.75425599 kg/d against a permitted limit of 1.32567999 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nickel, total recoverable
24% over limit
Discharged 0.20884 kg/d against a permitted limit of 0.16798 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Iron, total recoverable
57% over limit
Discharged 1.04238399 kg/d against a permitted limit of 0.66283999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 15, 2026 (4 hours ago)