AIRGAS MERCHANT GASES - CHESTER ASU PLANT
NPDES ID: VAG250058
X — SNC: Effluent violation (non-monthly average limit)
The facility discharged more of a pollutant than its permit allows, measured over a period other than a monthly average.
Violations
March 31, 2026
Chlorine, total residual
82% over limit
Discharged 0.02 mg/L against a permitted limit of 0.011 mg/L (MAXIMUM)
DMR, Limited - Numeric Violation
December 31, 2025
Chlorine, total residual
1627% over limit
Discharged 0.19 mg/L against a permitted limit of 0.011 mg/L (MAXIMUM)
DMR, Limited - Numeric Violation
September 30, 2025
Chlorine, total residual
1809% over limit
Discharged 0.21 mg/L against a permitted limit of 0.011 mg/L (MAXIMUM)
DMR, Limited - Numeric Violation
June 30, 2025
Chlorine, total residual
1445% over limit
Discharged 0.17 mg/L against a permitted limit of 0.011 mg/L (MAXIMUM)
DMR, Limited - Numeric Violation
March 31, 2025
Chlorine, total residual
3355% over limit
Discharged 0.38 mg/L against a permitted limit of 0.011 mg/L (MAXIMUM)
DMR, Limited - Numeric Violation
December 31, 2024
Copper, total recoverable
4% over limit
Discharged 0.00939 mg/L against a permitted limit of 0.009 mg/L (MAXIMUM)
DMR, Limited - Numeric Violation
Chlorine, total residual
1809% over limit
Discharged 0.21 mg/L against a permitted limit of 0.011 mg/L (MAXIMUM)
DMR, Limited - Numeric Violation
September 30, 2024
Copper, total recoverable
18% over limit
Discharged 0.0106 mg/L against a permitted limit of 0.009 mg/L (MAXIMUM)
DMR, Limited - Numeric Violation
Chlorine, total residual
809% over limit
Discharged 0.1 mg/L against a permitted limit of 0.011 mg/L (MAXIMUM)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (24 days ago)