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Air Liquide Large Industries U.S. LP

Industrial Gases, Plaquemine, Louisiana. NPDES permit LA0050695 expired Nov 6, 2021; its limits still apply. Last 12 months: over a limit once (last December 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A quarterly (6 values), outfall 001 form Q quarterly (2 values), outfall 003 form A quarterly (8 values), outfall 103 form A quarterly (6 values), outfall 301 form S twice a year
Last report on file
June 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 0 of 42 reports late

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

Period endingParameterReportedLimitOver by
December 2025Oil & Grease, daily maximum36.2 mg/L≤ 15 mg/L141%

Limits in force (30)

ParameterStatisticLimitMonthsOutfall
pHinstantaneous minimum≥ 6 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
Oil & Greasedaily maximum≤ 15 mg/Lall year001
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year001
Sulfate, total [as SO4]monthly average≤ 668.27 mg/Lall year001
Sulfate, total [as SO4]daily maximum≤ 1590.48 mg/Lall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
pHinstantaneous minimum≥ 6 SUall year003
pHinstantaneous maximum≤ 9 SUall year003
Oil & Greasedaily maximum≤ 15 mg/Lall year003
Oil & Greasemonthly average≤ 14.3 lb/dall year003
Oil & Greasedaily maximum≤ 28.6 lb/dall year003
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year003
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year003
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year003
Oil & Greasedaily maximum≤ 15 mg/Lall year103
Oil & Greasemonthly average≤ 14.3 lb/dall year103
Oil & Greasedaily maximum≤ 28.6 lb/dall year103
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year103
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year103
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year103
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year301
BOD, 5-day, 20 deg. Cdaily maximum≤ 45 mg/Lall year301
Solids, total suspendedmonthly average≤ 30 mg/Lall year301
Solids, total suspendeddaily maximum≤ 45 mg/Lall year301
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year301
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year301
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year301
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year301

How strict are these limits?

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

Same industry: the 130 Chemicals and Allied Products permits in Louisiana.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/LA0050695 · MCP: https://passage-data.com/mcp