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The Doe Run Resources Corporation

Lead And Zinc Ores, Potosi, Missouri. NPDES permit MO0133221, in force until Dec 31, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 28 days after each period: form Q quarterly (8 values), form WA yearly
Last report on file: September 2026
Oct 2024 – Sep 2025: 0 values over a limit, 0 required values missing, 0 of 5 reports late

Limits in force (10)

Parameter	Statistic	Limit	Months
pH	minimum	≥ 6.5 SU	all year
pH	maximum	≤ 9 SU	all year
Solids, total suspended	daily maximum	report only (mg/L)	all year
Zinc, dissolved [as Zn]	daily maximum	≤ 255 ug/L	all year
Cadmium, total recoverable	daily maximum	≤ 12.5 ug/L	all year
Lead, total recoverable	daily maximum	≤ 253 ug/L	all year
Copper, total recoverable	daily maximum	≤ 32.3 ug/L	all year
Toxicity [acute], Ceriodaphnia dubia	daily maximum	≤ 1 toxic	all year
Toxicity [acute], Pimephales promelas [Fathead Minnow]	daily maximum	≤ 1 toxic	all year
Storm water flow	daily maximum	report only (MGD)	all year

How strict are these limits?

Copper, total recoverable, daily maximum 32.3 ug/L — stricter than 45% of 249 other minor industrial and other permits nationwide
Cadmium, total recoverable, daily maximum 12.5 ug/L — stricter than 26% of 83 other minor industrial and other permits nationwide
Zinc, dissolved [as Zn], daily maximum 255 ug/L — stricter than 25% of 31 other minor industrial and other permits nationwide

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

Same industry: the 12 Metal Mining permits in Missouri.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MO0133221 · MCP: https://passage-data.com/mcp