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Matheson Tri-Gas Inc

Industrial Gases, Mount Vernon, Indiana. NPDES permit IN0001970 expired Oct 31, 2026. Last 12 months: over a limit 2 times (last April 2026), 1 of 25 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: outfall 001 form A monthly (12 values), outfall 002 form A monthly (9 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 25 reports late

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

Period endingParameterReportedLimitOver by
February 2026Temperature, water deg. fahrenheit, daily maximum56.6 deg F≤ 53 deg F7%
April 2026Oil and grease, hexane extr method, daily maximum5.2 mg/L≤ 5 mg/L4%

Limits in force (40)

ParameterStatisticLimitMonthsOutfall
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendeddaily maximum≤ 25 mg/Lall year001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all 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
E. coli, colony forming units [CFU]monthly geometric mean≤ 125 CFU/100mLApr–Oct001
E. coli, colony forming units [CFU]daily maximum≤ 235 CFU/100mLApr–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 40 mg/Lall year001
Flow, totalmonthly totalreport only (Mgal/mo)all year001
Temperature, water deg. fahrenheitdaily maximum≤ 73 deg FApr, Nov002
Temperature, water deg. fahrenheitdaily maximum≤ 63 deg FMar002
Temperature, water deg. fahrenheitdaily maximum≤ 53 deg FJan, Feb002
Temperature, water deg. fahrenheitdaily maximum≤ 83 deg FMay002
Temperature, water deg. fahrenheitdaily maximum≤ 90 deg FJun, Sep002
Temperature, water deg. fahrenheitdaily maximum≤ 81 deg FOct002
Temperature, water deg. fahrenheitdaily maximum≤ 92 deg FJul, Aug002
Temperature, water deg. fahrenheitdaily maximum≤ 60 deg FDec002
pHdaily minimum≥ 6 SUall year002
pHdaily maximum≤ 9 SUall year002
Solids, total suspendedmonthly averagereport only (mg/L)all year002
Solids, total suspendeddaily maximumreport only (mg/L)all year002
Oil and grease, hexane extr methoddaily maximum≤ 5 mg/Lall year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Flow, totalmonthly totalreport only (Mgal/mo)all year002
pHdaily maximumreport only (SU)Dec003
pHdaily maximumreport only (SU)Dec003
Solids, total suspendeddaily maximumreport only (mg/L)Dec003
Solids, total suspendeddaily maximumreport only (mg/L)Dec003
Oil and grease, hexane extr methoddaily maximumreport only (mg/L)Dec003
Oil and grease, hexane extr methoddaily maximumreport only (mg/L)Dec003
Chemical Oxygen Demand [COD]daily maximumreport only (mg/L)Dec003
Chemical Oxygen Demand [COD]daily maximumreport only (mg/L)Dec003
Storm water flowdaily maximumreport only (MGD)Dec003
Storm water flowdaily maximumreport only (MGD)Dec003
Flow, totalannual totalreport only (Mgal/yr)Dec003
Flow, totalannual totalreport only (Mgal/yr)Dec003

How strict are these limits?

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

Same industry: the 45 Chemicals and Allied Products permits in Indiana.

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IN0001970 · MCP: https://passage-data.com/mcp