EQUISTAR CHEMICALS LA PORTE COMPLEX
NPDES ID: TX0119792
D — SNC: Discharge monitoring report not received
The facility didn't submit its required discharge monitoring report.
This quarter: 2 reporting violations.
Violations
April 30, 2026
Chlorine, free available
0% over limit
Discharged 0 mg/L against a permitted limit of 0.2 mg/L (DAILY AV)
DMR, Limited - Overdue
Chlorine, free available
0% over limit
Discharged 0 mg/L against a permitted limit of 0.5 mg/L (DAILY MX)
DMR, Limited - Overdue
February 28, 2026
Solids, total suspended
8% over limit
Discharged 232 mg/L against a permitted limit of 214 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2026
Copper, total [as Cu]
2% over limit
Discharged 0.0106 mg/L against a permitted limit of 0.0104 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
December 31, 2025
Copper, total [as Cu]
25% over limit
Discharged 0.013 mg/L against a permitted limit of 0.0104 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Zinc, total [as Zn]
0% over limit
Discharged 0 kg/d against a permitted limit of 2.95099998 kg/d (DAILY MX)
DMR, Limited - Overdue
Copper, total [as Cu]
11% over limit
Discharged 0.0647404 kg/d against a permitted limit of 0.058112 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Zinc, total [as Zn]
0% over limit
Discharged 0 kg/d against a permitted limit of 1.39831999 kg/d (DAILY AV)
DMR, Limited - Overdue
November 30, 2025
Copper, total [as Cu]
9% over limit
Discharged 0.06356 kg/d against a permitted limit of 0.058112 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
17% over limit
Discharged 0.0122 mg/L against a permitted limit of 0.0104 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
September 30, 2025
Copper, total [as Cu]
4% over limit
Discharged 0.0108 mg/L against a permitted limit of 0.0104 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
August 31, 2025
Copper, total [as Cu]
28% over limit
Discharged 0.0133 mg/L against a permitted limit of 0.0104 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
9% over limit
Discharged 0.06356 kg/d against a permitted limit of 0.058112 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
July 31, 2025
Copper, total [as Cu]
5% over limit
Discharged 0.060836 kg/d against a permitted limit of 0.058112 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
18% over limit
Discharged 0.0123 mg/L against a permitted limit of 0.0104 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
June 30, 2025
Copper, total [as Cu]
8% over limit
Discharged 0.0112 mg/L against a permitted limit of 0.0104 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
May 31, 2025
Zinc, total [as Zn]
0% over limit
Discharged 0.00178 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Solids, total suspended
256% over limit
Discharged 530 mg/L against a permitted limit of 149 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 8.4 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Overdue
pH
0% over limit
Discharged 8.4 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Overdue
Oil & Grease
0% over limit
Discharged 2.4 mg/L against a permitted limit of 15 mg/L (DAILY MX)
DMR, Limited - Overdue
Cyanide, free available
0% over limit
Discharged 0.00164 mg/L against a permitted limit of 0.0055 mg/L (DAILY MX)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 1.95 MGD against a permitted limit of 0 MGD (DAILY AV)
DMR, Monitor Only - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 3.91 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
Aluminum, total [as Al]
0% over limit
Discharged 0.0685 mg/L against a permitted limit of 1766 mg/L (DAILY MX)
DMR, Limited - Overdue
Carbon, tot organic [TOC]
0% over limit
Discharged 11 mg/L against a permitted limit of 75 mg/L (DAILY MX)
DMR, Limited - Overdue
Oil & Grease
1320% over limit
Discharged 213 mg/L against a permitted limit of 15 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2025
Copper, total [as Cu]
15% over limit
Discharged 0.012 mg/L against a permitted limit of 0.0104 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Cyanide, free available
10% over limit
Discharged 0.0055 mg/L against a permitted limit of 0.005 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
March 31, 2025
Cyanide, free available
16% over limit
Discharged 0.032234 kg/d against a permitted limit of 0.027694 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
30% over limit
Discharged 0.0135 mg/L against a permitted limit of 0.0104 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
9% over limit
Discharged 0.06356 kg/d against a permitted limit of 0.058112 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Cyanide, free available
20% over limit
Discharged 0.006 mg/L against a permitted limit of 0.005 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
February 28, 2025
Cyanide, free available
20% over limit
Discharged 0.006 mg/L against a permitted limit of 0.005 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Cyanide, free available
8% over limit
Discharged 0.029964 kg/d against a permitted limit of 0.027694 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
January 31, 2025
Cyanide, free available
59% over limit
Discharged 0.044038 kg/d against a permitted limit of 0.027694 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Cyanide, free available
80% over limit
Discharged 0.009 mg/L against a permitted limit of 0.005 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Cyanide, free available
79% over limit
Discharged 0.019 mg/L against a permitted limit of 0.0106 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Cyanide, free available
32% over limit
Discharged 0.078542 kg/d against a permitted limit of 0.059474 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2024
Cyanide, free available
11% over limit
Discharged 0.030872 kg/d against a permitted limit of 0.027694 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
Cyanide, free available
20% over limit
Discharged 0.006 mg/L against a permitted limit of 0.005 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
November 30, 2024
Zinc, total [as Zn]
0% over limit
Discharged 0.130298 kg/d against a permitted limit of 1.39831999 kg/d (DAILY AV)
DMR, Limited - Overdue
Zinc, total [as Zn]
0% over limit
Discharged 0.130298 kg/d against a permitted limit of 2.95099998 kg/d (DAILY MX)
DMR, Limited - Overdue
October 31, 2024
Cyanide, free available
7% over limit
Discharged 0.0113 mg/L against a permitted limit of 0.0106 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Cyanide, free available
40% over limit
Discharged 0.007 mg/L against a permitted limit of 0.005 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
Cyanide, free available
23% over limit
Discharged 0.03405 kg/d against a permitted limit of 0.027694 kg/d (DAILY AV)
DMR, Limited - Numeric Violation
September 30, 2024
Hexachlorobenzene
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0000086 mg/L (DAILY AV)
DMR, Limited - Overdue
Hexachlorobenzene
0% over limit
Discharged 0 kg/d against a permitted limit of 0.00003904 kg/d (DAILY AV)
DMR, Limited - Overdue
Hexachlorobenzene
0% over limit
Discharged 0 kg/d against a permitted limit of 0.00008354 kg/d (DAILY MX)
DMR, Limited - Overdue
Hexachlorobenzene
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0000183 mg/L (DAILY MX)
DMR, Limited - Overdue
August 31, 2024
Copper, total [as Cu]
15% over limit
Discharged 0.012 mg/L against a permitted limit of 0.0104 mg/L (DAILY AV)
DMR, Limited - Numeric Violation
July 31, 2024
Carbon, tot organic [TOC]
71% over limit
Discharged 93.9 mg/L against a permitted limit of 55 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (24 days ago)