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Air Liquide Large Industries US LP

Industrial Gases, Bay City, Texas. NPDES permit TX0140520 expired May 24, 2026; its limits still apply. Last 12 months: over a limit 10 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due: About 20 days after each period: form A monthly (12 values)
Last report on file: August 2026
Oct 2024 – Sep 2025: 4 values over a limit, 0 required values missing, 2 of 12 reports late

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

Period ending	Parameter	Reported	Limit	Over by
November 2025	Solids, total suspended, daily average	59.2 mg/L	≤ 30 mg/L	97%
November 2025	Solids, total suspended, daily maximum	230 mg/L	≤ 100 mg/L	130%
November 2025	pH, maximum	9.12 SU	≤ 9 SU	—
December 2025	pH, maximum	9.17 SU	≤ 9 SU	—
February 2026	pH, maximum	9.2 SU	≤ 9 SU	—
June 2026	pH, maximum	9.08 SU	≤ 9 SU	—
July 2026	Copper, total [as Cu], daily average	.0225 mg/L	≤ .0151 mg/L	49%
July 2026	Copper, total [as Cu], daily maximum	.0681 mg/L	≤ .0319 mg/L	113%
July 2026	pH, maximum	9.05 SU	≤ 9 SU	—
August 2026	pH, maximum	9.04 SU	≤ 9 SU	—

Limits in force (12)

Parameter	Statistic	Limit	Months
Oxygen demand, chem. [high level] [COD]	daily average	report only (mg/L)	all year
Oxygen demand, chem. [high level] [COD]	daily maximum	≤ 200 mg/L	all year
pH	minimum	≥ 6 SU	all year
pH	maximum	≤ 9 SU	all year
Solids, total suspended	daily average	≤ 30 mg/L	all year
Solids, total suspended	daily maximum	≤ 100 mg/L	all year
Oil & Grease	daily average	≤ 5 lb/d	all year
Oil & Grease	daily maximum	≤ 10 lb/d	all year
Copper, total [as Cu]	daily average	≤ .0151 mg/L	all year
Copper, total [as Cu]	daily maximum	≤ .0319 mg/L	all year
Flow, in conduit or thru treatment plant	daily average	≤ .1801 MGD	all year
Flow, in conduit or thru treatment plant	daily maximum	≤ .27 MGD	all year

How strict are these limits?

Copper, total [as Cu], daily average .0151 mg/L — stricter than 82% of 67 other minor industrial and other permits in Texas
Copper, total [as Cu], daily maximum .0319 mg/L — stricter than 82% of 81 other minor industrial and other permits in Texas

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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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/TX0140520 · MCP: https://passage-data.com/mcp