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Mersen USA GSTN Corp.

Carbon And Graphite Products, Columbia, Tennessee. NPDES permit TN0002275, in force until Sep 30, 2028. Last 12 months: over a limit 2 times (last October 2025), 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form G monthly (16 values)
Renewal application due
Apr 3, 2028 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 2 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
October 2025Oil and grease, hexane extr method, daily maximum22 mg/L≤ 15 mg/L47%
October 2025Oil and grease, hexane extr method, monthly average22 mg/L≤ 10 mg/L120%

Limits in force (16)

ParameterStatisticLimitMonths
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 40 mg/Lall year
Solids, total suspendeddaily maximum≤ 70 mg/Lall year
Oil and grease, hexane extr methodmonthly average≤ 10 mg/Lall year
Oil and grease, hexane extr methoddaily maximum≤ 15 mg/Lall year
Benzo[a]pyrenemonthly averagereport only (mg/L)all year
Benzo[a]pyrenedaily maximumreport only (mg/L)all year
Indeno[1,2,3-cd]pyrenemonthly averagereport only (mg/L)all year
Indeno[1,2,3-cd]pyrenedaily maximumreport only (mg/L)all year
Benzo[a]anthracenemonthly averagereport only (mg/L)all year
Benzo[a]anthracenedaily 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
3,4-Benzofluoranthenemonthly averagereport only (mg/L)all year
3,4-Benzofluoranthenedaily maximumreport only (mg/L)all year

How strict are these limits?

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

Same industry: the 3 Electronic and Other Electrical Equipment permits in Tennessee.

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/TN0002275 · MCP: https://passage-data.com/mcp