ATI SPECIALTY MATERIALS - MONROE PLANT
NPDES ID: NC0045993
E — SNC: Effluent violation (monthly average limit)
The facility discharged more of a pollutant than its permit allows, based on a monthly average.
Violations
March 31, 2026
Copper, total [as Cu]
0% over limit
Discharged 0.019 mg/L against a permitted limit of 0.01896 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
7% over limit
Discharged 0.0165 mg/L against a permitted limit of 0.01538 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Copper, total [as Cu]
42% over limit
Discharged 0.027 mg/L against a permitted limit of 0.01896 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
50% over limit
Discharged 0.023 mg/L against a permitted limit of 0.01538 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Copper, total [as Cu]
20% over limit
Discharged 0.0185 mg/L against a permitted limit of 0.01538 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
5% over limit
Discharged 0.02 mg/L against a permitted limit of 0.01896 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2025
Copper, total [as Cu]
30% over limit
Discharged 0.02 mg/L against a permitted limit of 0.01538 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
16% over limit
Discharged 0.022 mg/L against a permitted limit of 0.01896 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2025
Copper, total [as Cu]
79% over limit
Discharged 0.034 mg/L against a permitted limit of 0.01896 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nickel, total [as Ni]
110% over limit
Discharged 0.085806 kg/d against a permitted limit of 0.04086 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Chromium, total [as Cr]
33% over limit
Discharged 0.05448 kg/d against a permitted limit of 0.04086 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
72% over limit
Discharged 0.0265 mg/L against a permitted limit of 0.01538 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Chromium, total [as Cr]
66% over limit
Discharged 0.030191 kg/d against a permitted limit of 0.01816 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Nickel, total [as Ni]
164% over limit
Discharged 0.155722 kg/d against a permitted limit of 0.05902 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2025
Nickel, total [as Ni]
76% over limit
Discharged 0.103966 kg/d against a permitted limit of 0.05902 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Chromium, total [as Cr]
89% over limit
Discharged 0.034277 kg/d against a permitted limit of 0.01816 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Chromium, total [as Cr]
60% over limit
Discharged 0.065376 kg/d against a permitted limit of 0.04086 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nickel, total [as Ni]
41% over limit
Discharged 0.057658 kg/d against a permitted limit of 0.04086 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Copper, total [as Cu]
19% over limit
Discharged 0.01825 mg/L against a permitted limit of 0.01538 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
25% over limit
Discharged 0.0237 mg/L against a permitted limit of 0.01896 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
May 31, 2025
Copper, total [as Cu]
30% over limit
Discharged 0.0246 mg/L against a permitted limit of 0.01896 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
36% over limit
Discharged 0.02095 mg/L against a permitted limit of 0.01538 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Nickel, total [as Ni]
19% over limit
Discharged 0.048805 kg/d against a permitted limit of 0.04086 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Nickel, total [as Ni]
33% over limit
Discharged 0.078542 kg/d against a permitted limit of 0.05902 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2025
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 2 mg/L (30DA AVG)
DMR, Limited - Overdue
Copper, total [as Cu]
23% over limit
Discharged 0.01895 mg/L against a permitted limit of 0.01538 mg/L (30DA AVG)
DMR, Limited - Overdue
Copper, total [as Cu]
23% over limit
Discharged 0.01895 mg/L against a permitted limit of 0.01538 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Fluoride, total [as F]
0% over limit
Discharged 0.0920258 kg/d against a permitted limit of 19.67635983 kg/d (30DA AVG)
DMR, Limited - Overdue
Conductivity
0% over limit
Discharged 156 umho/cm against a permitted limit of 0 umho/cm (DAILY MX)
DMR, Monitor Only - Overdue
Lead, total [as Pb]
0% over limit
Discharged 0.0003178 kg/d against a permitted limit of 0.2724 kg/d (DAILY MX)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 6.2 mg/L against a permitted limit of 30 mg/L (30DA AVG)
DMR, Limited - Overdue
Nickel, total [as Ni]
0% over limit
Discharged 0.00454 kg/d against a permitted limit of 0.04086 kg/d (30DA AVG)
DMR, Limited - Overdue
Temperature, water deg. centigrade
0% over limit
Discharged 21.8 deg C against a permitted limit of 0 deg C (DAILY MX)
DMR, Monitor Only - Overdue
Chromium, total [as Cr]
0% over limit
Discharged 0.00227 kg/d against a permitted limit of 0.04086 kg/d (DAILY MX)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 10 mg/L (DAILY MX)
DMR, Limited - Overdue
Oil & Grease
0% over limit
Discharged 0 mg/L against a permitted limit of 15 mg/L (DAILY MX)
DMR, Limited - Overdue
Conductivity
0% over limit
Discharged 336 umho/cm against a permitted limit of 0 umho/cm (DAILY MX)
DMR, Monitor Only - Overdue
Cyanide, total [as CN]
0% over limit
Discharged 0 kg/d against a permitted limit of 0.077634 kg/d (30DA AVG)
DMR, Limited - Overdue
Chromium, total [as Cr]
0% over limit
Discharged 0.001362 kg/d against a permitted limit of 0.01816 kg/d (30DA AVG)
DMR, Limited - Overdue
Fluoride, total [as F]
0% over limit
Discharged 0.1411032 kg/d against a permitted limit of 44.84157962 kg/d (DAILY MX)
DMR, Limited - Overdue
Cyanide, total [as CN]
0% over limit
Discharged 0 kg/d against a permitted limit of 0.224276 kg/d (DAILY MX)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 7.5 mg/L against a permitted limit of 45 mg/L (DAILY MX)
DMR, Limited - Overdue
Temperature, water deg. centigrade
0% over limit
Discharged 22.9 deg C against a permitted limit of 0 deg C (DAILY MX)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 7.1 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Overdue
Conductivity
0% over limit
Discharged 160 umho/cm against a permitted limit of 0 umho/cm (DAILY MX)
DMR, Monitor Only - Overdue
Oil & Grease
0% over limit
Discharged 0 mg/L against a permitted limit of 10 mg/L (30DA AVG)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.3929 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 6.7 SU against a permitted limit of 6 SU (DAILY MN)
DMR, Limited - Overdue
Zinc, total [as Zn]
0% over limit
Discharged 0.004994 kg/d against a permitted limit of 0.39498 kg/d (30DA AVG)
DMR, Limited - Overdue
Temperature, water deg. centigrade
0% over limit
Discharged 25 deg C against a permitted limit of 0 deg C (DAILY MX)
DMR, Monitor Only - Overdue
Nickel, total [as Ni]
0% over limit
Discharged 0.007264 kg/d against a permitted limit of 0.05902 kg/d (DAILY MX)
DMR, Limited - Overdue
Lead, total [as Pb]
0% over limit
Discharged 0.0001816 kg/d against a permitted limit of 0.13166 kg/d (30DA AVG)
DMR, Limited - Overdue
Zinc, total [as Zn]
0% over limit
Discharged 0.008172 kg/d against a permitted limit of 0.94885999 kg/d (DAILY MX)
DMR, Limited - Overdue
Copper, total [as Cu]
0% over limit
Discharged 0.019 mg/L against a permitted limit of 0.01896 mg/L (DAILY MX)
DMR, Limited - Overdue
Copper, total [as Cu]
0% over limit
Discharged 0.019 mg/L against a permitted limit of 0.01896 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2025
Copper, total [as Cu]
19% over limit
Discharged 0.0226 mg/L against a permitted limit of 0.01896 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
36% over limit
Discharged 0.02095 mg/L against a permitted limit of 0.01538 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Copper, total [as Cu]
34% over limit
Discharged 0.0254 mg/L against a permitted limit of 0.01896 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
43% over limit
Discharged 0.02195 mg/L against a permitted limit of 0.01538 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Copper, total [as Cu]
38% over limit
Discharged 0.0212 mg/L against a permitted limit of 0.01538 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
18% over limit
Discharged 0.0224 mg/L against a permitted limit of 0.01896 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2024
Copper, total [as Cu]
16% over limit
Discharged 0.022 mg/L against a permitted limit of 0.01896 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
43% over limit
Discharged 0.022 mg/L against a permitted limit of 0.01538 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Copper, total [as Cu]
2% over limit
Discharged 0.0193 mg/L against a permitted limit of 0.01896 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
15% over limit
Discharged 0.0177 mg/L against a permitted limit of 0.01538 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
October 31, 2024
Copper, total [as Cu]
14% over limit
Discharged 0.0175 mg/L against a permitted limit of 0.01538 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
0% over limit
Discharged 0.019 mg/L against a permitted limit of 0.01896 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (22 days ago)