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Crucible MTN, LLC

Lead And Zinc Ores, major discharger, Elmwood, Tennessee. NPDES permit TN0004227, in force until Jul 31, 2028. Last 12 months: over a limit 3 times (last December 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 74 days after each period: form G quarterly (32 values)
Renewal application due
Feb 2, 2028 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 3 of 12 reports late

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

Period endingParameterReportedLimitOver by
October 2025Solids, total suspended, daily maximum48 mg/L≤ 30 mg/L60%
October 2025Solids, total suspended, monthly average26.2 mg/L≤ 20 mg/L31%
December 2025Zinc, total [as Zn], daily maximum1.3 mg/L≤ 1 mg/L30%

Limits in force (32)

ParameterStatisticLimitMonths
pHminimum≥ 6 SUall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 20 mg/Lall year
Solids, total suspendedmonthly average≤ 20 mg/Lall year
Solids, total suspendeddaily maximum≤ 30 mg/Lall year
Solids, total suspendeddaily maximum≤ 30 mg/Lall year
Cadmium, total [as Cd]monthly average≤ .05 mg/Lall year
Cadmium, total [as Cd]monthly average≤ .05 mg/Lall year
Cadmium, total [as Cd]daily maximum≤ .1 mg/Lall year
Cadmium, total [as Cd]daily maximum≤ .1 mg/Lall year
Copper, total [as Cu]monthly average≤ .15 mg/Lall year
Copper, total [as Cu]monthly average≤ .15 mg/Lall year
Copper, total [as Cu]daily maximum≤ .3 mg/Lall year
Copper, total [as Cu]daily maximum≤ .3 mg/Lall year
Lead, total [as Pb]monthly average≤ .3 mg/Lall year
Lead, total [as Pb]monthly average≤ .3 mg/Lall year
Lead, total [as Pb]daily maximum≤ .6 mg/Lall year
Lead, total [as Pb]daily maximum≤ .6 mg/Lall year
Zinc, total [as Zn]monthly average≤ .75 mg/Lall year
Zinc, total [as Zn]monthly average≤ .75 mg/Lall year
Zinc, total [as Zn]daily maximum≤ 1 mg/Lall year
Zinc, total [as Zn]daily maximum≤ 1 mg/Lall year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)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
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Mercury, total [as Hg]monthly average≤ .001 mg/Lall year
Mercury, total [as Hg]monthly average≤ .001 mg/Lall year
Mercury, total [as Hg]daily maximum≤ .002 mg/Lall year
Mercury, total [as Hg]daily maximum≤ .002 mg/Lall year

How strict are these limits?

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

Same industry: the 10 Metal Mining permits in Tennessee.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/TN0004227 · MCP: https://passage-data.com/mcp