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Crucible Zinc, Inc.

Lead And Zinc Ores, major discharger, Clarksville, Tennessee. NPDES permit TN0029157, in force until Oct 31, 2030. Last 12 months: no values over a limit, 9 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form G monthly (20 values), outfall 002 form G monthly (9 values), outfall SW3 form Q quarterly (9 values), outfall SW4 form Q quarterly (9 values), outfall SW5 form B quarterly (9 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 36 reports late

Limits in force (56)

ParameterStatisticLimitMonthsOutfall
Conductivitymonthly averagereport only (umho/cm)all year001
Conductivitydaily maximumreport only (umho/cm)all year001
pHdaily minimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 2642 lb/dall year001
Solids, total suspendeddaily maximum≤ 5248 lb/dall year001
Arsenic, total [as As]monthly average≤ 16.26 lb/dall year001
Arsenic, total [as As]daily maximum≤ 35.2 lb/dall year001
Cadmium, total [as Cd]monthly average≤ 2.15 lb/dall year001
Cadmium, total [as Cd]daily maximum≤ 5.38 lb/dall year001
Copper, total [as Cu]monthly average≤ 17.3 lb/dall year001
Copper, total [as Cu]daily maximum≤ 36.1 lb/dall year001
Lead, total [as Pb]monthly average≤ 3.46 lb/dall year001
Lead, total [as Pb]daily maximum≤ 7.42 lb/dall year001
Zinc, total [as Zn]monthly average≤ 15 lb/dall year001
Zinc, total [as Zn]daily maximum≤ 35.5 lb/dall year001
Selenium, total [as Se]monthly average≤ 4.68 lb/dall year001
Selenium, total [as Se]daily maximum≤ 62.4 lb/dall 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
pHdaily minimum≥ 6 SUall year002
pHmaximum≤ 9 SUall year002
Solids, total suspendeddaily maximum≤ 40 mg/Lall year002
Cadmium, total [as Cd]daily maximumreport only (mg/L)all year002
Zinc, total [as Zn]daily maximumreport only (mg/L)all 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
LC50 Static 48Hr Acute Ceriodaphnia dubiaminimum≥ 100 % (alert, not enforceable)all year002
LC50 Static 48Hr Acute Pimephales promelasminimum≥ 100 % (alert, not enforceable)all year002
pHminimum≥ 6 SU (alert, not enforceable)all yearSW3
pHmaximum≤ 9 SU (alert, not enforceable)all yearSW3
Solids, total suspendeddaily maximumreport only (mg/L) (alert, not enforceable)all yearSW3
Cadmium, total [as Cd]daily maximumreport only (mg/L) (alert, not enforceable)all yearSW3
Copper, total [as Cu]daily maximumreport only (mg/L) (alert, not enforceable)all yearSW3
Lead, total [as Pb]daily maximumreport only (mg/L) (alert, not enforceable)all yearSW3
Zinc, total [as Zn]daily maximumreport only (mg/L) (alert, not enforceable)all yearSW3
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD) (alert, not enforceable)all yearSW3
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD) (alert, not enforceable)all yearSW3
pHminimum≥ 6 SU (alert, not enforceable)all yearSW4
pHmaximum≤ 9 SU (alert, not enforceable)all yearSW4
Solids, total suspendeddaily maximumreport only (mg/L) (alert, not enforceable)all yearSW4
Cadmium, total [as Cd]daily maximumreport only (mg/L) (alert, not enforceable)all yearSW4
Copper, total [as Cu]daily maximumreport only (mg/L) (alert, not enforceable)all yearSW4
Lead, total [as Pb]daily maximumreport only (mg/L) (alert, not enforceable)all yearSW4
Zinc, total [as Zn]daily maximumreport only (mg/L) (alert, not enforceable)all yearSW4
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD) (alert, not enforceable)all yearSW4
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD) (alert, not enforceable)all yearSW4
pHminimum≥ 6 SU (alert, not enforceable)all yearSW5
pHmaximum≤ 9 SU (alert, not enforceable)all yearSW5
Solids, total suspendeddaily maximumreport only (mg/L) (alert, not enforceable)all yearSW5
Cadmium, total [as Cd]daily maximumreport only (mg/L) (alert, not enforceable)all yearSW5
Copper, total [as Cu]daily maximumreport only (mg/L) (alert, not enforceable)all yearSW5
Lead, total [as Pb]daily maximumreport only (mg/L) (alert, not enforceable)all yearSW5
Zinc, total [as Zn]daily maximumreport only (mg/L) (alert, not enforceable)all yearSW5
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD) (alert, not enforceable)all yearSW5
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD) (alert, not enforceable)all yearSW5

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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