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Matheson Tri-Gas, Inc

Welding Apparatus, Lincoln, Nebraska. NPDES permit NE0113921, in force until Dec 31, 2028. Last 12 months: over a limit 2 times (last March 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form M quarterly (2 values), form Q quarterly (6 values), form A yearly
Last report on file
June 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 17 reports late

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

Period endingParameterReportedLimitOver by
March 2026Chlorine, total residual, daily maximum.057 mg/L≤ .046 mg/L24%
March 2026Chlorine, total residual, monthly average.057 mg/L≤ .023 mg/L148%

Limits in force (16)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year
Temperature, water deg. fahrenheitdaily maximum≤ 90 deg Fall year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
Chloride [as Cl]monthly averagereport only (mg/L)all year
Chloride [as Cl]daily maximumreport only (mg/L)all year
Zinc, dissolved [as Zn]monthly averagereport only (mg/L)all year
Zinc, dissolved [as Zn]daily maximumreport only (mg/L)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualmonthly average≤ .023 mg/LMar–May
Chlorine, total residualmonthly average≤ .021 mg/LJun–Oct
Chlorine, total residualmonthly average≤ .024 mg/LJan, Feb, Nov, Dec
Chlorine, total residualdaily maximum≤ .046 mg/LMar–May
Chlorine, total residualdaily maximum≤ .042 mg/LJun–Oct
Chlorine, total residualdaily maximum≤ .049 mg/LJan, Feb, Nov, Dec

How strict are these limits?

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

Same industry: the 3 Industrial and Commercial Machinery and Computer Equipment permits in Nebraska.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/NE0113921 · MCP: https://passage-data.com/mcp