CALIFORNIA STEEL INDUSTRIES, FONTANA
NPDES ID: CA0105449
S — SNC: Compliance schedule violation
The facility missed a deadline in its compliance schedule by more than 90 days.
This quarter: 4 effluent violations.
Violations
April 30, 2026
Solids, total suspended
33% over limit
Discharged 100 mg/L against a permitted limit of 75 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Zinc, total recoverable
515% over limit
Discharged 0.72000003 mg/L against a permitted limit of 0.11700001 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
164% over limit
Discharged 0.037 mg/L against a permitted limit of 0.014 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Lead, total recoverable
1061% over limit
Discharged 0.065 mg/L against a permitted limit of 0.0056 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2026
Zinc, total recoverable
156% over limit
Discharged 0.30000001 mg/L against a permitted limit of 0.11700001 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2026
Zinc, total recoverable
37% over limit
Discharged 0.16000001 mg/L against a permitted limit of 0.11700001 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2025
Zinc, total recoverable
191% over limit
Discharged 0.34000002 mg/L against a permitted limit of 0.11700001 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2025
Zinc, total recoverable
27% over limit
Discharged 0.14820001 mg/L against a permitted limit of 0.11700001 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2025
Copper, total recoverable
53% over limit
Discharged 0.0214 mg/L against a permitted limit of 0.014 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2025
Copper, total recoverable
54% over limit
Discharged 0.0216 mg/L against a permitted limit of 0.014 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 8.9 SU against a permitted limit of 8.5 SU (MAXIMUM)
DMR, Limited - Numeric Violation
Solids, total suspended
55% over limit
Discharged 116.2 mg/L against a permitted limit of 75 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Lead, total recoverable
379% over limit
Discharged 0.0268 mg/L against a permitted limit of 0.0056 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Zinc, total recoverable
200% over limit
Discharged 0.35050002 mg/L against a permitted limit of 0.11700001 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2025
Lead, total recoverable
132% over limit
Discharged 0.013 mg/L against a permitted limit of 0.0056 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
7% over limit
Discharged 0.015 mg/L against a permitted limit of 0.014 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Zinc, total recoverable
97% over limit
Discharged 0.23000001 mg/L against a permitted limit of 0.11700001 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2025
pH
0% over limit
Discharged 0 SU against a permitted limit of 0 SU (MINIMUM)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Overdue
Zinc, total recoverable
25% over limit
Discharged 0.14620001 mg/L against a permitted limit of 0.11700001 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2024
Copper, total recoverable
111% over limit
Discharged 0.0295 mg/L against a permitted limit of 0.014 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Zinc, total recoverable
303% over limit
Discharged 0.47170002 mg/L against a permitted limit of 0.11700001 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Lead, total recoverable
464% over limit
Discharged 0.0316 mg/L against a permitted limit of 0.0056 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 8.8 SU against a permitted limit of 8.5 SU (MAXIMUM)
DMR, Limited - Numeric Violation
Solids, total suspended
36% over limit
Discharged 101.8 mg/L against a permitted limit of 75 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)