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Airgas USA LLC

Industrial Gases, La Porte, Texas. NPDES permit TX0136638, in force until Dec 12, 2030. Last 12 months: over a limit once (last February 2026), 4 required values missing, 3 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (14 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
February 2026Solids, total suspended, daily average62.3 mg/L≤ 30 mg/L108%

Limits in force (14)

ParameterStatisticLimitMonths
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendeddaily average≤ 30 mg/Lall year
Solids, total suspendeddaily maximum≤ 100 mg/Lall year
Oil & Greasedaily average≤ 15 mg/Lall year
Oil & Greasedaily maximum≤ 20 mg/Lall year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Copper, total [as Cu]daily average≤ .008 mg/Lall year
Copper, total [as Cu]daily maximum≤ .018 mg/Lall year
Zinc, total [as Zn]daily average≤ .075 mg/Lall year
Zinc, total [as Zn]daily maximum≤ .159 mg/Lall year
Flow, in conduit or thru treatment plantdaily average≤ .01 MGDall year
Flow, in conduit or thru treatment plantdaily maximum≤ .015 MGDall year
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all 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.

Check this month's numbers Email me before each report is due

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