STEEL DYNAMICS INC - FLAT ROLL GROUP, BUTLER DIVISION
NPDES ID: IN0059021
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: 2 effluent violations.
Violations
April 30, 2026
Zinc, total recoverable
95% over limit
Discharged 2.12017998 kg/d against a permitted limit of 1.08959999 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Zinc, total recoverable
20% over limit
Discharged 0.76181199 kg/d against a permitted limit of 0.63559999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
pH
0% over limit
Discharged 9.1 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2026
pH
0% over limit
Discharged 9.1 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
Toxicity [chronic], Ceriodaphnia dubia
733% over limit
Discharged 10 toxic against a permitted limit of 1.2 toxic (MAXIMUM)
DMR, Limited - Numeric Violation
Toxicity [chronic], Ceriodaphnia dubia
100% over limit
Discharged 2.2 toxic against a permitted limit of 1.1 toxic (MAXIMUM)
DMR, Limited - Numeric Violation
December 31, 2025
Toxicity [chronic], Ceriodaphnia dubia
83% over limit
Discharged 2.2 toxic against a permitted limit of 1.2 toxic (MAXIMUM)
DMR, Limited - Numeric Violation
Toxicity [chronic], Ceriodaphnia dubia
317% over limit
Discharged 5 toxic against a permitted limit of 1.2 toxic (MAXIMUM)
DMR, Limited - Numeric Violation
August 31, 2025
pH
0% over limit
Discharged 9.2 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
July 31, 2025
Oil and grease, hexane extr method
0% over limit
Discharged 0 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Overdue
Oil and grease, hexane extr method
0% over limit
Discharged 0 mg/L against a permitted limit of 15 mg/L (DAILY MX)
DMR, Limited - Overdue
Oil and grease, hexane extr method
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (DAILY MX)
DMR, Monitor Only - Overdue
Oil and grease, hexane extr method
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (MO AVG)
DMR, Monitor Only - Overdue
June 30, 2025
Toxicity [chronic], Ceriodaphnia dubia
17% over limit
Discharged 1.4 toxic against a permitted limit of 1.2 toxic (MAXIMUM)
DMR, Limited - Numeric Violation
May 31, 2025
pH
0% over limit
Discharged 9.1 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)