SOUTHWEST SHIPYARD
NPDES ID: TX0092282
S — SNC: Compliance schedule violation
The facility missed a deadline in its compliance schedule by more than 90 days.
This quarter: 1 effluent violation.
Violations
April 30, 2026
Cyanide, free available
10% over limit
Discharged 0.0203 mg/L against a permitted limit of 0.0185 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2026
BOD, carbonaceous [5 day, 20 C]
34% over limit
Discharged 26.7 mg/L against a permitted limit of 20 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Acetophenone
79% over limit
Discharged 0.204 mg/L against a permitted limit of 0.114 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Acetophenone
8% over limit
Discharged 0.03632454 kg/d against a permitted limit of 0.0336414 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Acetophenone
263% over limit
Discharged 0.204 mg/L against a permitted limit of 0.0562 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
May 31, 2025
Enterococci
11043% over limit
Discharged 3900 MPN/100mL against a permitted limit of 35 MPN/100mL (DAILY AV)
DMR, Limited - Numeric Violation
Enterococci
3650% over limit
Discharged 3900 MPN/100mL against a permitted limit of 104 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2025
BOD, carbonaceous [5 day, 20 C]
30% over limit
Discharged 26 mg/L against a permitted limit of 20 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2024
Cyanide, free available
53% over limit
Discharged 0.013475 mg/L against a permitted limit of 0.00878 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
34% over limit
Discharged 26.8 mg/L against a permitted limit of 20 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Cyanide, free available
29% over limit
Discharged 0.0239 mg/L against a permitted limit of 0.0185 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (24 days ago)