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Walker Ruby Mining Co Inc

Gold Ores, Ouray County, Colorado. NPDES permit CO0037206 expired Aug 31, 2018; its limits still apply. Last 12 months: over a limit 5 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (12 values), form Q quarterly (31 values), form X quarterly (6 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
5 values over a limit, 0 required values missing, 0 of 20 reports late

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

Period endingParameterReportedLimitOver by
May 2026Flow, in conduit or thru treatment plant, 30-day average< .0777 MGD≤ .054 MGD44%
June 2026Flow, in conduit or thru treatment plant, 30-day average< .0777 MGD≤ .054 MGD44%
July 2026Flow, in conduit or thru treatment plant, 30-day average< .0777 MGD≤ .054 MGD44%
August 2026Flow, in conduit or thru treatment plant, 30-day average< .0777 MGD≤ .054 MGD44%
September 2026Flow, in conduit or thru treatment plant, 30-day average< .0777 MGD≤ .054 MGD44%

Limits in force (53)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademaximum weekly averagereport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspended30-day average≤ 20 mg/Lall year
Solids, total suspendedmaximum 7-day average≤ 30 mg/Lall year
Cyanide, weak acid, dissociabledaily maximumreport only (ug/L)all year
Arsenic, total recoverable30-day averagereport only (ug/L)all year
Iron, total recoverable30-day averagereport only (ug/L)all year
Cadmium, total [as Cd]30-day average≤ 50 ug/Lall year
Cadmium, total [as Cd]daily maximum≤ 100 ug/Lall year
Copper, total [as Cu]30-day average≤ 150 ug/Lall year
Copper, total [as Cu]daily maximum≤ 300 ug/Lall year
Lead, total [as Pb]30-day average≤ 300 ug/Lall year
Lead, total [as Pb]daily maximum≤ 600 ug/Lall year
Zinc, total [as Zn]30-day average≤ 750 ug/Lall year
Zinc, total [as Zn]daily maximum≤ 1500 ug/Lall year
Chromium, hexavalent dissolved [as Cr]30-day averagereport only (ug/L)all year
Chromium, hexavalent dissolved [as Cr]daily maximumreport only (ug/L)all year
Zinc, potentially dissolved30-day average≤ 88 ug/Lall year
Zinc, potentially dissolveddaily maximum≤ 116 ug/Lall year
Copper, potentially dissolved30-day average≤ 7.2 ug/Lall year
Copper, potentially dissolved30-day average≤ 6.6 ug/Lall year
Copper, potentially dissolveddaily maximum≤ 11 ug/Lall year
Copper, potentially dissolveddaily maximum≤ 9.6 ug/Lall year
Arsenic, potentially dissolveddaily maximumreport only (ug/L)all year
Chromium, trivalent, potentially dissolvd30-day averagereport only (ug/L)all year
Lead, potentially dissolvd30-day average≤ 1.9 ug/Lall year
Lead, potentially dissolvd30-day average≤ 1.7 ug/Lall year
Lead, potentially dissolvddaily maximum≤ 48 ug/Lall year
Lead, potentially dissolvddaily maximum≤ 47 ug/Lall year
Manganese, potentially dissolvd30-day averagereport only (ug/L)all year
Manganese, potentially dissolvddaily maximumreport only (ug/L)all year
Nickel, potentially dissolvd30-day averagereport only (ug/L)all year
Nickel, potentially dissolvddaily maximumreport only (ug/L)all year
Selenium, potentially dissolvd30-day average≤ 5.2 ug/Lall year
Selenium, potentially dissolvddaily maximum≤ 21 ug/Lall year
Oil and greaseinstantaneous maximum≤ 10 mg/Lall year
Chromium, trivalent total recoverable30-day averagereport only (ug/L)all year
Chromium, trivalent total recoverabledaily maximumreport only (ug/L)all year
Flow, in conduit or thru treatment plant30-day average≤ .054 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Solids, total dissolved30-day averagereport only (mg/L)all year
Solids, total dissolveddaily maximumreport only (mg/L)all year
Mercury, total [as Hg]30-day average≤ 1 ug/Lall year
Mercury, total [as Hg]daily maximum≤ 2 ug/Lall year
Oil and grease visualinstantaneous maximumreport only (abst=0;prst=1)all year
Static Renewal 7 Day Chronic Ceriodaphnia dubiasingle samplereport only (tox chronic)all year
Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum valuereport only (tox chronic)all year
Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum value≥ 25 tox chronicall year
Static Renewal 7 Day Chronic Pimephales promelassingle samplereport only (tox chronic)all year
Static Renewal 7 Day Chronic Pimephales promelasminimum valuereport only (tox chronic)all year
Static Renewal 7 Day Chronic Pimephales promelasminimum value≥ 25 tox chronicall year

How strict are these limits?

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

Same industry: the 30 Metal Mining permits in Colorado.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/CO0037206 · MCP: https://passage-data.com/mcp