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Silver Ores, major discharger, Platoro, Colorado. NPDES permit CO0038954 expired May 31, 2024; its limits still apply. Last 12 months: over a limit 10 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| April 2026 | Arsenic, total recoverable, 30-day average | 168 ug/L | ≤ 44.6 ug/L | 277% |
| April 2026 | Manganese, dissolved [as Mn], 30-day average | 3719.55 ug/L | ≤ 458 ug/L | 712% |
| May 2026 | Arsenic, total recoverable, 30-day average | 87.25 ug/L | ≤ 44.6 ug/L | 96% |
| May 2026 | Manganese, dissolved [as Mn], 30-day average | 638.3 ug/L | ≤ 458 ug/L | 39% |
| June 2026 | Arsenic, total recoverable, 30-day average | 232.37 ug/L | ≤ 44.6 ug/L | 421% |
| June 2026 | Iron, total recoverable, rolling average | 1933.5 ug/L | ≤ 1681 ug/L | 15% |
| June 2026 | Manganese, dissolved [as Mn], 30-day average | 472.5 ug/L | ≤ 458 ug/L | 3% |
| August 2026 | Arsenic, total recoverable, 30-day average | 87.8 ug/L | ≤ 44.6 ug/L | 97% |
| August 2026 | Flow, in conduit or thru treatment plant, 30-day average | .406 MGD | ≤ .288 MGD | 41% |
| August 2026 | Manganese, dissolved [as Mn], 30-day average | 520.95 ug/L | ≤ 458 ug/L | 14% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | minimum | ≥ 6.5 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 002 |
| Solids, total suspended | maximum 7-day average | ≤ 45 mg/L | all year | 002 |
| Arsenic, total recoverable | 30-day average | ≤ 65 ug/L | all year | 002 |
| Arsenic, total recoverable | 30-day average | ≤ 22.5 ug/L | all year | 002 |
| Arsenic, total recoverable | 30-day average | ≤ 53.4 ug/L | all year | 002 |
| Iron, total recoverable | 30-day average | ≤ 1000 ug/L | all year | 002 |
| Iron, total recoverable | rolling average | ≤ 218 ug/L | all year | 002 |
| Manganese, dissolved [as Mn] | 30-day average | ≤ 458 ug/L | all year | 002 |
| Manganese, dissolved [as Mn] | daily maximum | ≤ 4738 ug/L | all year | 002 |
| Chromium, total recoverable | daily maximum | ≤ 50 ug/L | all year | 002 |
| Chromium, total recoverable | rolling average | ≤ 7.5 ug/L | all year | 002 |
| Molybdenum, total recoverable | 30-day average | report only (ug/L) | all year | 002 |
| Molybdenum, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Zinc, potentially dissolved | 30-day average | ≤ 135 ug/L | all year | 002 |
| Zinc, potentially dissolved | daily maximum | ≤ 315 ug/L | all year | 002 |
| Silver, potentially dissolved | 30-day average | ≤ .14 ug/L | all year | 002 |
| Silver, potentially dissolved | daily maximum | ≤ .81 ug/L | all year | 002 |
| Copper, potentially dissolved | 30-day average | ≤ 27 ug/L | all year | 002 |
| Copper, potentially dissolved | daily maximum | ≤ 25 ug/L | all year | 002 |
| Cadmium, potentially dissolvd | 30-day average | ≤ .56 ug/L | all year | 002 |
| Cadmium, potentially dissolvd | daily maximum | ≤ 3.6 ug/L | all year | 002 |
| Chromium, trivalent, potentially dissolvd | 30-day average | ≤ 15 ug/L | all year | 002 |
| Chromium, trivalent, potentially dissolvd | daily maximum | ≤ 50 ug/L | all year | 002 |
| Chromium, trivalent, potentially dissolvd | rolling average | ≤ 2.3 ug/L | all year | 002 |
| Lead, potentially dissolvd | 30-day average | ≤ 4.5 ug/L | all year | 002 |
| Lead, potentially dissolvd | daily maximum | ≤ 84 ug/L | all year | 002 |
| Nickel, potentially dissolvd | 30-day average | ≤ 160 ug/L | all year | 002 |
| Nickel, potentially dissolvd | daily maximum | ≤ 1038 ug/L | all year | 002 |
| Nickel, potentially dissolvd | rolling average | ≤ 24 ug/L | all year | 002 |
| Selenium, potentially dissolvd | 30-day average | report only (ug/L) | all year | 002 |
| Selenium, potentially dissolvd | daily maximum | report only (ug/L) | all year | 002 |
| Uranium, potentially dissolvd | 30-day average | report only (ug/L) | all year | 002 |
| Uranium, potentially dissolvd | daily maximum | report only (ug/L) | all year | 002 |
| Oil and grease | instantaneous maximum | ≤ 10 mg/L | all year | 002 |
| Radium 226 + radium 228, total | 30-day average | report only (pCi/L) | all year | 002 |
| Uranium, total | 30-day average | report only (ug/L) | all year | 002 |
| Uranium, total | daily maximum | report only (ug/L) | all year | 002 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .2 MGD | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Mercury, total [low level] | 30-day average | ≤ .2 ug/L | all year | 002 |
| Sulfide-hydrogen sulfide [undissociated] | 30-day average | report only (mg/L) | all year | 002 |
| Sulfide-hydrogen sulfide [undissociated] | 30-day average | ≤ .002 mg/L | all year | 002 |
| Hydrocarbons, total petroleum | 30-day average | report only (ug/L) | all year | 002 |
| Hydrocarbons, total petroleum | daily maximum | report only (ug/L) | all year | 002 |
| Oil and grease visual | instantaneous maximum | report only (abst=0;prst=1) | all year | 002 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | single sample | report only (tox chronic) | all year | 002 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | report only (tox chronic) | all year | 002 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | ≥ 100 tox chronic | all year | 002 |
| Static Renewal 7 Day Chronic Pimephales promelas | single sample | report only (tox chronic) | all year | 002 |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | report only (tox chronic) | all year | 002 |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | ≥ 100 tox chronic | all year | 002 |
| Temperature, water deg. centigrade | maximum weekly average | report only (deg C) | all year | 004 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 004 |
| pH | minimum | ≥ 6.5 SU | all year | 004 |
| pH | maximum | ≤ 9 SU | all year | 004 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 004 |
| Solids, total suspended | maximum 7-day average | ≤ 45 mg/L | all year | 004 |
| Arsenic, total recoverable | 30-day average | ≤ 65 ug/L | all year | 004 |
| Arsenic, total recoverable | 30-day average | ≤ 22.5 ug/L | all year | 004 |
| Arsenic, total recoverable | 30-day average | ≤ 44.6 ug/L | all year | 004 |
| Iron, total recoverable | 30-day average | ≤ 13844 ug/L | all year | 004 |
| Iron, total recoverable | rolling average | ≤ 1681 ug/L | all year | 004 |
| Iron, dissolved [as Fe] | 30-day average | ≤ 3869 ug/L | all year | 004 |
| Manganese, dissolved [as Mn] | 30-day average | ≤ 458 ug/L | all year | 004 |
| Manganese, dissolved [as Mn] | daily maximum | ≤ 17850 ug/L | all year | 004 |
| Chromium, total recoverable | daily maximum | ≤ 583 ug/L | all year | 004 |
| Chromium, total recoverable | rolling average | ≤ 88 ug/L | all year | 004 |
| Molybdenum, total recoverable | 30-day average | report only (ug/L) | all year | 004 |
| Molybdenum, total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Zinc, potentially dissolved | 30-day average | ≤ 135 ug/L | all year | 004 |
| Zinc, potentially dissolved | daily maximum | ≤ 315 ug/L | all year | 004 |
| Silver, potentially dissolved | 30-day average | ≤ .18 ug/L | all year | 004 |
| Silver, potentially dissolved | 30-day average | ≤ .042 ug/L | all year | 004 |
| Silver, potentially dissolved | daily maximum | ≤ .81 ug/L | all year | 004 |
| Copper, potentially dissolved | 30-day average | ≤ 22 ug/L | all year | 004 |
| Copper, potentially dissolved | daily maximum | ≤ 25 ug/L | all year | 004 |
| Cadmium, potentially dissolvd | 30-day average | ≤ .56 ug/L | all year | 004 |
| Cadmium, potentially dissolvd | daily maximum | ≤ 3.6 ug/L | all year | 004 |
| Chromium, trivalent, potentially dissolvd | 30-day average | ≤ 242 ug/L | all year | 004 |
| Chromium, trivalent, potentially dissolvd | daily maximum | ≤ 583 ug/L | all year | 004 |
| Chromium, trivalent, potentially dissolvd | rolling average | ≤ 88 ug/L | all year | 004 |
| Lead, potentially dissolvd | 30-day average | ≤ 4.5 ug/L | all year | 004 |
| Lead, potentially dissolvd | daily maximum | ≤ 84 ug/L | all year | 004 |
| Nickel, potentially dissolvd | 30-day average | ≤ 160 ug/L | all year | 004 |
| Nickel, potentially dissolvd | daily maximum | ≤ 1038 ug/L | all year | 004 |
| Nickel, potentially dissolvd | rolling average | ≤ 24 ug/L | all year | 004 |
| Selenium, potentially dissolvd | 30-day average | report only (ug/L) | all year | 004 |
| Selenium, potentially dissolvd | daily maximum | report only (ug/L) | all year | 004 |
| Uranium, potentially dissolvd | 30-day average | report only (ug/L) | all year | 004 |
| Uranium, potentially dissolvd | daily maximum | report only (ug/L) | all year | 004 |
| Oil and grease | instantaneous maximum | ≤ 10 mg/L | all year | 004 |
| Radium 226 + radium 228, total | 30-day average | report only (pCi/L) | all year | 004 |
| Uranium, total | 30-day average | report only (ug/L) | all year | 004 |
| Uranium, total | daily maximum | report only (ug/L) | all year | 004 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .288 MGD | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| Sulfide-hydrogen sulfide [undissociated] | 30-day average | ≤ .032 mg/L | all year | 004 |
| Mercury, total [as Hg] | 30-day average | ≤ .18 ug/L | all year | 004 |
| Sulfate | 30-day average | report only (mg/L) | all year | 004 |
| Sulfate | daily maximum | report only (mg/L) | all year | 004 |
| Hydrocarbons, total petroleum | 30-day average | report only (ug/L) | all year | 004 |
| Hydrocarbons, total petroleum | daily maximum | report only (ug/L) | all year | 004 |
| Oil and grease visual | instantaneous maximum | report only (abst=0;prst=1) | all year | 004 |
| LC50 Static Renewal 48Hr Acute Daphnia magna | minimum value | ≥ 100 % | all year | 004 |
| LC50 Static Renewal 96Hr Acute Pimephales promelas | minimum value | ≥ 100 % | all year | 004 |
| pH | minimum | report only (SU) | all year | 005 |
| pH | maximum | report only (SU) | all year | 005 |
| Arsenic, total recoverable | 30-day average | report only (ug/L) | all year | 005 |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Iron, total recoverable | 30-day average | report only (ug/L) | all year | 005 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Zinc, potentially dissolved | 30-day average | report only (ug/L) | all year | 005 |
| Zinc, potentially dissolved | daily maximum | report only (ug/L) | all year | 005 |
| Silver, potentially dissolved | 30-day average | report only (ug/L) | all year | 005 |
| Silver, potentially dissolved | daily maximum | report only (ug/L) | all year | 005 |
| Arsenic, potentially dissolved | 30-day average | report only (ug/L) | all year | 005 |
| Arsenic, potentially dissolved | daily maximum | report only (ug/L) | all year | 005 |
| Cadmium, potentially dissolvd | 30-day average | report only (ug/L) | all year | 005 |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | all year | 005 |
| Chromium, trivalent, potentially dissolvd | 30-day average | report only (ug/L) | all year | 005 |
| Chromium, trivalent, potentially dissolvd | daily maximum | report only (ug/L) | all year | 005 |
| Lead, potentially dissolvd | 30-day average | report only (ug/L) | all year | 005 |
| Lead, potentially dissolvd | daily maximum | report only (ug/L) | all year | 005 |
| Nickel, potentially dissolvd | 30-day average | report only (ug/L) | all year | 005 |
| Nickel, potentially dissolvd | daily maximum | report only (ug/L) | all year | 005 |
| Chromium, trivalent total recoverable | 30-day average | report only (ug/L) | all year | 005 |
| Chromium, trivalent total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Mercury, total [as Hg] | 30-day average | report only (ug/L) | all year | 005 |
| Mercury, total [as Hg] | daily maximum | report only (ug/L) | all year | 005 |
| pH | minimum | report only (SU) | all year | 006 |
| pH | maximum | report only (SU) | all year | 006 |
| Arsenic, total recoverable | 30-day average | report only (ug/L) | all year | 006 |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year | 006 |
| Iron, total recoverable | 30-day average | report only (ug/L) | all year | 006 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 006 |
| Zinc, potentially dissolved | 30-day average | report only (ug/L) | all year | 006 |
| Zinc, potentially dissolved | daily maximum | report only (ug/L) | all year | 006 |
| Silver, potentially dissolved | 30-day average | report only (ug/L) | all year | 006 |
| Silver, potentially dissolved | daily maximum | report only (ug/L) | all year | 006 |
| Arsenic, potentially dissolved | 30-day average | report only (ug/L) | all year | 006 |
| Arsenic, potentially dissolved | daily maximum | report only (ug/L) | all year | 006 |
| Cadmium, potentially dissolvd | 30-day average | report only (ug/L) | all year | 006 |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | all year | 006 |
| Chromium, trivalent, potentially dissolvd | 30-day average | report only (ug/L) | all year | 006 |
| Chromium, trivalent, potentially dissolvd | daily maximum | report only (ug/L) | all year | 006 |
| Lead, potentially dissolvd | 30-day average | report only (ug/L) | all year | 006 |
| Lead, potentially dissolvd | daily maximum | report only (ug/L) | all year | 006 |
| Nickel, potentially dissolvd | 30-day average | report only (ug/L) | all year | 006 |
| Nickel, potentially dissolvd | daily maximum | report only (ug/L) | all year | 006 |
| Chromium, trivalent total recoverable | 30-day average | report only (ug/L) | all year | 006 |
| Chromium, trivalent total recoverable | daily maximum | report only (ug/L) | all year | 006 |
| Mercury, total [as Hg] | 30-day average | report only (ug/L) | all year | 006 |
| Mercury, total [as Hg] | daily maximum | report only (ug/L) | all year | 006 |
| Temperature, water deg. centigrade | maximum weekly average | report only (deg C) | all year | UST1 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | UST1 |
Cited limits by parameter: Colorado's rules and the federal ones.
Same industry: the 30 Metal Mining permits in Colorado.
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Your permit document is the final word. As JSON: /api/v1/permits/CO0038954 · MCP: https://passage-data.com/mcp