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Matheson Tri-Gas Inc

Industrial Gases, Waxahachie, Texas. NPDES permit TX0118745, in force until Feb 8, 2027. Last 12 months: no values over a limit, 2 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: form A monthly (19 values)
Renewal application due
Aug 12, 2026 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 1 of 12 reports late

Limits in force (19)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendeddaily maximum≤ 100 mg/Lall year
Solids, total suspendeddaily maximum≤ 33.36 lb/dall year
Nitrogen, ammonia total [as N]daily maximum≤ 3.6 mg/Lall year
Selenium, total [as Se]daily average≤ .0168 mg/Lall year
Selenium, total [as Se]daily maximum≤ .0356 mg/Lall year
Flow, in conduit or thru treatment plantdaily average≤ .04 MGDall year
Flow, in conduit or thru treatment plantdaily maximum≤ .05 MGDall year
Chlorine, total residualdaily average≤ .2 mg/Lall year
Chlorine, total residualdaily maximum≤ .5 mg/Lall year
Chlorine, total residualdaily average≤ .07 lb/dall year
Chlorine, total residualdaily maximum≤ .17 lb/dall year
Solids, total dissolved [TDS]daily average≤ 4000 mg/Lall year
Solids, total dissolved [TDS]daily maximum≤ 8480 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 88.5 mg/Lall year
Sulfatedaily average≤ 667 mg/Lall year
Sulfatedaily maximum≤ 1413 mg/Lall 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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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/TX0118745 · MCP: https://passage-data.com/mcp