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Rio Grande Silver Inc

Lead And Zinc Ores, Creede, Colorado. NPDES permit CO0048960, in force until Jul 31, 2031. No reports in EPA's file for the last 12 months. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (57 values), outfall 002 form MI monthly (1 value), outfall 003 form A monthly (31 values), outfall 003 form MI monthly (1 value), outfall 004 form MI monthly (1 value), outfall 005 form MI monthly (1 value), and 1 more form
Last report on file
None in EPA's file for the last 12 months; that may be EPA's gap, not the facility's

Limits in force (119)

ParameterStatisticLimitMonthsOutfall
Solids, total suspended30-day average≤ 20 mg/Lall year001
Solids, total suspendeddaily maximum≤ 30 mg/Lall year001
Arsenic, total recoverable30-day average≤ 3 ug/Lall year001
Iron, total recoverable30-day average≤ 1000 ug/Lall year001
Thallium, total recoverable30-day averagereport only (ug/L)all year001
Beryllium, total recoverable [as Be]30-day averagereport only (ug/L)all year001
Barium, total recoverable30-day averagereport only (ug/L)all year001
Barium, total recoverabledaily maximumreport only (ug/L)all year001
Manganese, dissolved [as Mn]30-day average≤ 50 ug/Lall year001
Thallium, dissolved [as Tl]30-day averagereport only (ug/L)all year001
Nickel, total recoverable30-day averagereport only (ug/L)all year001
Zinc, total recoverable30-day average≤ 750 ug/Lall year001
Zinc, total recoverabledaily maximum≤ 1500 ug/Lall year001
Aluminum, total recoverable30-day average≤ 767 ug/Lall year001
Aluminum, total recoverable30-day average≤ 767 ug/Lall year001
Aluminum, total recoverabledaily maximum≤ 1471 ug/Lall year001
Aluminum, total recoverabledaily maximum≤ 5730 ug/Lall year001
Cadmium, total recoverable30-day average≤ 50 ug/Lall year001
Cadmium, total recoverabledaily maximum≤ 100 ug/Lall year001
Lead, total recoverable30-day average≤ 300 ug/Lall year001
Lead, total recoverabledaily maximum≤ 600 ug/Lall year001
Copper, total recoverable30-day average≤ 150 ug/Lall year001
Copper, total recoverabledaily maximum≤ 300 ug/Lall year001
Chromium, hexavalent dissolved [as Cr]30-day averagereport only (ug/L)all year001
Chromium, hexavalent dissolved [as Cr]daily maximumreport only (ug/L)all year001
Zinc, potentially dissolved30-day average≤ 1558 ug/LApr–Jul001
Zinc, potentially dissolved30-day average≤ 164 ug/LJan, Feb, Mar, Aug, Sep, Oct, Nov, Dec001
Zinc, potentially dissolveddaily maximum≤ 1940 ug/LApr–Jul001
Zinc, potentially dissolveddaily maximum≤ 857 ug/LJan, Feb, Mar, Aug, Sep, Oct, Nov, Dec001
Silver, potentially dissolved30-day average≤ .56 ug/Lall year001
Silver, potentially dissolved30-day average≤ .56 ug/Lall year001
Silver, potentially dissolveddaily maximum≤ .7 ug/Lall year001
Silver, potentially dissolveddaily maximum≤ 3.6 ug/Lall year001
Copper, potentially dissolved30-day average≤ 5.3 ug/LApr–Jul001
Copper, potentially dissolved30-day average≤ 12 ug/LJan, Feb, Mar, Aug, Sep, Oct, Nov, Dec001
Copper, potentially dissolveddaily maximum≤ 7.5 ug/LApr–Jul001
Copper, potentially dissolveddaily maximum≤ 18 ug/LJan, Feb, Mar, Aug, Sep, Oct, Nov, Dec001
Beryllium, potentially dissolvd30-day average≤ .5 ug/LJan, Feb, Mar, Aug, Sep, Oct, Nov, Dec001
Beryllium, potentially dissolvddaily maximum≤ .83 ug/LJan, Feb, Mar, Aug, Sep, Oct, Nov, Dec001
Cadmium, potentially dissolvd30-day average≤ 5.9 ug/LApr–Jul001
Cadmium, potentially dissolvddaily maximum≤ 7.1 ug/LApr–Jul001
Cadmium, potentially dissolvd30-day average≤ .5 ug/LJan, Feb, Mar, Aug, Sep, Oct, Nov, Dec001
Cadmium, potentially dissolvddaily maximum≤ .83 ug/LJan, Feb, Mar, Aug, Sep, Oct, Nov, Dec001
Chromium, trivalent, potentially dissolvd30-day averagereport only (ug/L)all year001
Chromium, trivalent, potentially dissolvddaily maximumreport only (ug/L)all year001
Lead, potentially dissolvd30-day average≤ 1.68 ug/LApr–Jul001
Lead, potentially dissolvd30-day average≤ 3.6 ug/LJan, Feb, Mar, Aug, Sep, Oct, Nov, Dec001
Lead, potentially dissolvddaily maximum≤ 33 ug/LApr–Jul001
Lead, potentially dissolvddaily maximum≤ 92 ug/LJan, Feb, Mar, Aug, Sep, Oct, Nov, Dec001
Manganese, potentially dissolvd30-day average≤ 1343 ug/LApr–Jul001
Manganese, potentially dissolvd30-day average≤ 1429 ug/LJan, Feb, Mar, Aug, Sep, Oct, Nov, Dec001
Manganese, potentially dissolvd30-day average≤ 1343 ug/LApr–Jul001
Manganese, potentially dissolvddaily maximum≤ 2462 ug/LApr–Jul001
Manganese, potentially dissolvddaily maximum≤ 3332 ug/LJan, Feb, Mar, Aug, Sep, Oct, Nov, Dec001
Manganese, potentially dissolvddaily maximum≤ 2432 ug/LApr–Jul001
Nickel, potentially dissolvd30-day averagereport only (ug/L)all year001
Nickel, potentially dissolvddaily maximumreport only (ug/L)all year001
Selenium, potentially dissolvd30-day average≤ 4.6 ug/Lall year001
Selenium, potentially dissolvddaily maximum≤ 18 ug/Lall year001
Uranium, potentially dissolvd30-day averagereport only (ug/L)all year001
Uranium, potentially dissolvddaily maximumreport only (ug/L)all year001
Oil and greaseinstantaneous maximum≤ 10 mg/Lall year001
Chromium, trivalent total recoverable30-day averagereport only (ug/L)all year001
Radium 226 & 228, dissolved30-day averagereport only (pCi/L)all year001
Radium 226 + radium 228, total30-day averagereport only (pCi/L)all year001
Uranium, total30-day averagereport only (ug/L)all year001
Chlorine, total residual30-day average≤ .011 mg/Lall year001
Chlorine, total residualinstantaneous maximum≤ .019 mg/Lall year001
Mercury, total [low level]30-day average≤ .01 ug/Lall year001
Mercury, total [low level]daily maximum≤ 2 ug/Lall year001
Sulfide-hydrogen sulfide [undissociated]30-day averagereport only (mg/L)all year001
Sulfate30-day averagereport only (mg/L)all year001
Oil and grease visualinstantaneous maximumreport only (abst=0;prst=1)all year001
Static Renewal 7 Day Chronic Ceriodaphnia dubiasingle samplereport only (tox chronic)all year001
Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum valuereport only (tox chronic)all year001
Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum value≥ 100 tox chronicall year001
Static Renewal 7 Day Chronic Pimephales promelassingle samplereport only (tox chronic)all year001
Static Renewal 7 Day Chronic Pimephales promelasminimum valuereport only (tox chronic)all year001
Static Renewal 7 Day Chronic Pimephales promelasminimum value≥ 100 tox chronicall year001
Area inspection visualinstantaneous maximumreport only (pass=0;fail=1)all year002
Area inspection visualinstantaneous maximumreport only (pass=0;fail=1)Dec002
pHminimum≥ 6.5 SUall year003
pHmaximum≤ 9 SUall year003
Arsenic, total recoverable30-day averagereport only (ug/L)all year003
Iron, total recoverable30-day averagereport only (ug/L)all year003
Iron, dissolved [as Fe]30-day averagereport only (ug/L)all year003
Manganese, dissolved [as Mn]30-day averagereport only (ug/L)all year003
Nickel, total recoverable30-day averagereport only (ug/L)all year003
Cadmium, total recoverable30-day averagereport only (ug/L)all year003
Lead, total recoverabledaily maximumreport only (ug/L)all year003
Chromium, hexavalent dissolved [as Cr]30-day averagereport only (ug/L)all year003
Chromium, hexavalent dissolved [as Cr]daily maximumreport only (ug/L)all year003
Zinc, potentially dissolved30-day averagereport only (ug/L)all year003
Zinc, potentially dissolveddaily maximumreport only (ug/L)all year003
Silver, potentially dissolved30-day averagereport only (ug/L)all year003
Silver, potentially dissolveddaily maximumreport only (ug/L)all year003
Copper, potentially dissolved30-day averagereport only (ug/L)all year003
Copper, potentially dissolveddaily maximumreport only (ug/L)all year003
Cadmium, potentially dissolvd30-day averagereport only (ug/L)all year003
Cadmium, potentially dissolvddaily maximumreport only (ug/L)all year003
Chromium, trivalent, potentially dissolvd30-day averagereport only (ug/L)all year003
Chromium, trivalent, potentially dissolvddaily maximumreport only (ug/L)all year003
Lead, potentially dissolvd30-day averagereport only (ug/L)all year003
Lead, potentially dissolvddaily maximumreport only (ug/L)all year003
Manganese, potentially dissolvd30-day averagereport only (ug/L)all year003
Manganese, potentially dissolvddaily maximumreport only (ug/L)all year003
Nickel, potentially dissolvd30-day averagereport only (ug/L)all year003
Nickel, potentially dissolvddaily maximumreport only (ug/L)all year003
Selenium, potentially dissolvd30-day averagereport only (ug/L)all year003
Selenium, potentially dissolvddaily maximumreport only (ug/L)all year003
Chromium, trivalent total recoverable30-day averagereport only (ug/L)all year003
Mercury, total low level30-day averagereport only (ug/L)all year003
Area inspection visualinstantaneous maximumreport only (pass=0;fail=1)all year003
Area inspection visualinstantaneous maximumreport only (pass=0;fail=1)Dec003
Area inspection visualinstantaneous maximumreport only (pass=0;fail=1)all year004
Area inspection visualinstantaneous maximumreport only (pass=0;fail=1)Dec004
Area inspection visualinstantaneous maximumreport only (pass=0;fail=1)all year005
Area inspection visualinstantaneous maximumreport only (pass=0;fail=1)Dec005
Area inspection visualinstantaneous maximumreport only (pass=0;fail=1)Dec006

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.

Check this month's numbers Email me before each report is due

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Your permit document is the final word. As JSON: /api/v1/permits/CO0048960 · MCP: https://passage-data.com/mcp