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Asarco, Inc.

Copper Ores, Sahuarita, Arizona. NPDES permit AZ0024635 expired Mar 31, 2026; its limits still apply. Last 12 months: no values over a limit, 153 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 89 days after each period: form A quarterly (7 values), form B quarterly (10 values)
Last report on file
None
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 6 of 24 reports late

Limits in force (17)

ParameterStatisticLimitMonths
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendeddaily maximumreport only (mg/L) (alert, not enforceable)all year
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year
Hardness, total [as CaCO3]daily maximumreport only (mg/L) (alert, not enforceable)all year
Arsenic, total recoverabledaily maximum≤ 420 ug/L (alert, not enforceable)all year
Selenium, total recoverabledaily maximum≤ 33 ug/L (alert, not enforceable)all year
Zinc, total recoverabledaily maximum≤ 2.491 mg/Lall year
Cadmium, total recoverabledaily maximum≤ 181 ug/L (alert, not enforceable)all year
Lead, total recoverabledaily maximum≤ .015 mg/Lall year
Chromium, total recoverabledaily maximum≤ 100 ug/L (alert, not enforceable)all year
Copper, total recoverabledaily maximum≤ .057 mg/Lall year
Chromium, hexavalent dissolved [as Cr]daily maximum≤ 34 ug/L (alert, not enforceable)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 recoverabledaily maximum≤ 2 ug/L (alert, not enforceable)all year
Chemical Oxygen Demand [COD]daily maximumreport only (mg/L) (alert, not enforceable)all year

How strict are these limits?

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

Same industry: the 8 Metal Mining permits in Arizona.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/AZ0024635 · MCP: https://passage-data.com/mcp