WARSAW BLACK OXIDE, INC.
NPDES ID: IN0004278
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.
Violations
April 30, 2026
Zinc, total recoverable
444% over limit
Discharged 3.59 mg/L against a permitted limit of 0.66 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Zinc, total recoverable
24% over limit
Discharged 0.044946 kg/d against a permitted limit of 0.03632 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Zinc, total recoverable
330% over limit
Discharged 0.370918 kg/d against a permitted limit of 0.08626 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Zinc, total recoverable
68% over limit
Discharged 0.469 mg/L against a permitted limit of 0.28 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Zinc, total recoverable
92% over limit
Discharged 1.27 mg/L against a permitted limit of 0.66 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Zinc, total recoverable
49% over limit
Discharged 0.418 mg/L against a permitted limit of 0.28 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Zinc, total recoverable
18% over limit
Discharged 0.10215 kg/d against a permitted limit of 0.08626 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2026
Zinc, total recoverable
54% over limit
Discharged 0.43 mg/L against a permitted limit of 0.28 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Zinc, total recoverable
120% over limit
Discharged 1.45 mg/L against a permitted limit of 0.66 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Zinc, total recoverable
6% over limit
Discharged 0.091708 kg/d against a permitted limit of 0.08626 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2025
Zinc, total recoverable
402% over limit
Discharged 1.406 mg/L against a permitted limit of 0.28 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Zinc, total recoverable
346% over limit
Discharged 0.567046 kg/d against a permitted limit of 0.12712 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Chloride [as Cl]
30% over limit
Discharged 761 mg/L against a permitted limit of 586 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Zinc, total recoverable
926% over limit
Discharged 6.77 mg/L against a permitted limit of 0.66 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Zinc, total recoverable
125% over limit
Discharged 0.12258 kg/d against a permitted limit of 0.05448 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
44% over limit
Discharged 533 mg/L against a permitted limit of 370 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Zinc, total recoverable
23% over limit
Discharged 0.814 mg/L against a permitted limit of 0.66 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2025
Chloride [as Cl]
4% over limit
Discharged 385 mg/L against a permitted limit of 370 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2024
Zinc, total recoverable
23% over limit
Discharged 0.81 mg/L against a permitted limit of 0.66 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Fluoride, total [as F]
0% over limit
Discharged 1.9 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Fluoride, total [as F]
0% over limit
Discharged 1.9 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
November 30, 2024
Zinc, total recoverable
55% over limit
Discharged 0.435 mg/L against a permitted limit of 0.28 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Zinc, total recoverable
188% over limit
Discharged 1.9 mg/L against a permitted limit of 0.66 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2024
Copper, total recoverable
69% over limit
Discharged 0.149 mg/L against a permitted limit of 0.088 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)