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Messer LLC

Industrial Gases, La Porte, Texas. NPDES permit TX0135101, in force until Jun 11, 2031. Last 12 months: over a limit 2 times (last October 2025), 2 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (17 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 1 of 12 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
October 2025Copper, total [as Cu], daily average.095 mg/L≤ .0435 mg/L118%
October 2025Copper, total [as Cu], daily maximum.21 mg/L≤ .0921 mg/L128%

Limits in force (17)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendeddaily average≤ 30 mg/Lall year
Solids, total suspendeddaily maximum≤ 100 mg/Lall year
Solids, total suspendeddaily average≤ 62.6 lb/dall year
Solids, total suspendeddaily maximum≤ 208.6 lb/dall year
Oil & Greasedaily average≤ 16.5 mg/Lall year
Oil & Greasedaily maximum≤ 23.7 mg/Lall year
Oil & Greasedaily average≤ 33.9 lb/dall year
Oil & Greasedaily maximum≤ 48.4 lb/dall year
Copper, total [as Cu]daily average≤ .0435 mg/Lall year
Copper, total [as Cu]daily maximum≤ .0921 mg/Lall year
Copper, total [as Cu]daily average≤ .091 lb/dall year
Copper, total [as Cu]daily maximum≤ .192 lb/dall year
Flow, in conduit or thru treatment plantdaily average≤ .25 MGDall year
Flow, in conduit or thru treatment plantdaily maximum≤ .35 MGDall year

How strict are these limits?

Cited limits by parameter: Texas's rules and the federal ones.

Same industry: the 165 Chemicals and Allied Products permits in Texas.

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Your permit document is the final word. As JSON: /api/v1/permits/TX0135101 · MCP: https://passage-data.com/mcp