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Gold Ores, Boulder County, Colorado. NPDES permit CO0032751 expired Mar 31, 2019; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Temperature, water deg. centigrade | maximum weekly average | report only (deg C) | all year |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year |
| pH | minimum | ≥ 6.5 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | all year |
| Arsenic, total recoverable | 30-day average | report only (ug/L) | all year |
| Iron, total recoverable | 30-day average | report only (ug/L) | all year |
| Zinc, total recoverable | 30-day average | ≤ 750 ug/L | all year |
| Zinc, total recoverable | daily maximum | ≤ 1500 ug/L | all year |
| Cadmium, total recoverable | 30-day average | ≤ 50 ug/L | all year |
| Cadmium, total recoverable | daily maximum | ≤ 300 ug/L | all year |
| Lead, total recoverable | 30-day average | ≤ 300 ug/L | all year |
| Lead, total recoverable | daily maximum | ≤ 600 ug/L | all year |
| Copper, total recoverable | 30-day average | ≤ 150 ug/L | all year |
| Copper, total recoverable | daily maximum | ≤ 300 ug/L | all year |
| Chromium, hexavalent dissolved [as Cr] | 30-day average | report only (ug/L) | all year |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | report only (ug/L) | all year |
| Zinc, potentially dissolved | 30-day average | ≤ 186 ug/L | Jan |
| Zinc, potentially dissolved | 30-day average | ≤ 186 ug/L | Feb |
| Zinc, potentially dissolved | 30-day average | ≤ 176 ug/L | Mar |
| Zinc, potentially dissolved | 30-day average | ≤ 176 ug/L | Apr |
| Zinc, potentially dissolved | 30-day average | ≤ 182 ug/L | May |
| Zinc, potentially dissolved | 30-day average | ≤ 262 ug/L | Jun |
| Zinc, potentially dissolved | 30-day average | ≤ 221 ug/L | Jul |
| Zinc, potentially dissolved | 30-day average | ≤ 241 ug/L | Aug |
| Zinc, potentially dissolved | 30-day average | ≤ 257 ug/L | Sep |
| Zinc, potentially dissolved | 30-day average | ≤ 262 ug/L | Oct |
| Zinc, potentially dissolved | 30-day average | ≤ 202 ug/L | Nov |
| Zinc, potentially dissolved | 30-day average | ≤ 186 ug/L | Dec |
| Zinc, potentially dissolved | daily maximum | ≤ 184 ug/L | Jan |
| Zinc, potentially dissolved | daily maximum | ≤ 203 ug/L | Feb |
| Zinc, potentially dissolved | daily maximum | ≤ 194 ug/L | Mar |
| Zinc, potentially dissolved | daily maximum | ≤ 202 ug/L | Apr |
| Zinc, potentially dissolved | daily maximum | ≤ 208 ug/L | May |
| Zinc, potentially dissolved | daily maximum | ≤ 301 ug/L | Jun |
| Zinc, potentially dissolved | daily maximum | ≤ 253 ug/L | Jul |
| Zinc, potentially dissolved | daily maximum | ≤ 263 ug/L | Aug |
| Zinc, potentially dissolved | daily maximum | ≤ 248 ug/L | Sep |
| Zinc, potentially dissolved | daily maximum | ≤ 291 ug/L | Oct |
| Zinc, potentially dissolved | daily maximum | ≤ 232 ug/L | Nov |
| Zinc, potentially dissolved | daily maximum | ≤ 182 ug/L | Dec |
| Silver, potentially dissolved | 30-day average | ≤ .11 ug/L | Mar |
| Silver, potentially dissolved | 30-day average | ≤ .12 ug/L | Jan |
| Silver, potentially dissolved | 30-day average | ≤ .12 ug/L | Feb |
| Silver, potentially dissolved | 30-day average | ≤ .11 ug/L | Apr |
| Silver, potentially dissolved | 30-day average | ≤ .12 ug/L | May |
| Silver, potentially dissolved | 30-day average | ≤ .17 ug/L | Jun |
| Silver, potentially dissolved | 30-day average | ≤ .14 ug/L | Jul |
| Silver, potentially dissolved | 30-day average | ≤ .16 ug/L | Aug |
| Silver, potentially dissolved | 30-day average | ≤ .17 ug/L | Sep |
| Silver, potentially dissolved | 30-day average | ≤ .17 ug/L | Oct |
| Silver, potentially dissolved | 30-day average | ≤ .13 ug/L | Nov |
| Silver, potentially dissolved | 30-day average | ≤ .12 ug/L | Dec |
| Silver, potentially dissolved | daily maximum | ≤ 3 ug/L | Mar |
| Silver, potentially dissolved | daily maximum | ≤ 2.9 ug/L | Jan |
| Silver, potentially dissolved | daily maximum | ≤ 3.2 ug/L | Feb |
| Silver, potentially dissolved | daily maximum | ≤ 3.1 ug/L | Apr |
| Silver, potentially dissolved | daily maximum | ≤ 3.2 ug/L | May |
| Silver, potentially dissolved | daily maximum | ≤ 4.7 ug/L | Jun |
| Silver, potentially dissolved | daily maximum | ≤ 3.9 ug/L | Jul |
| Silver, potentially dissolved | daily maximum | ≤ 4.1 ug/L | Aug |
| Silver, potentially dissolved | daily maximum | ≤ 3.8 ug/L | Sep |
| Silver, potentially dissolved | daily maximum | ≤ 4.5 ug/L | Oct |
| Silver, potentially dissolved | daily maximum | ≤ 3.6 ug/L | Nov |
| Silver, potentially dissolved | daily maximum | ≤ 2.8 ug/L | Dec |
| Copper, potentially dissolved | 30-day average | ≤ 13 ug/L | Mar |
| Copper, potentially dissolved | 30-day average | ≤ 13 ug/L | Feb |
| Copper, potentially dissolved | 30-day average | ≤ 13 ug/L | Jan |
| Copper, potentially dissolved | 30-day average | ≤ 13 ug/L | Apr |
| Copper, potentially dissolved | 30-day average | ≤ 13 ug/L | May |
| Copper, potentially dissolved | 30-day average | ≤ 13 ug/L | Jun |
| Copper, potentially dissolved | 30-day average | ≤ 16 ug/L | Jul |
| Copper, potentially dissolved | 30-day average | ≤ 17 ug/L | Aug |
| Copper, potentially dissolved | 30-day average | ≤ 19 ug/L | Sep |
| Copper, potentially dissolved | 30-day average | ≤ 19 ug/L | Oct |
| Copper, potentially dissolved | 30-day average | ≤ 14 ug/L | Nov |
| Copper, potentially dissolved | 30-day average | ≤ 13 ug/L | Dec |
| Copper, potentially dissolved | daily maximum | ≤ 19 ug/L | Mar |
| Copper, potentially dissolved | daily maximum | ≤ 20 ug/L | Feb |
| Copper, potentially dissolved | daily maximum | ≤ 18 ug/L | Jan |
| Copper, potentially dissolved | daily maximum | ≤ 20 ug/L | Apr |
| Copper, potentially dissolved | daily maximum | ≤ 20 ug/L | May |
| Copper, potentially dissolved | daily maximum | ≤ 20 ug/L | Jun |
| Copper, potentially dissolved | daily maximum | ≤ 25 ug/L | Jul |
| Copper, potentially dissolved | daily maximum | ≤ 25 ug/L | Aug |
| Copper, potentially dissolved | daily maximum | ≤ 28 ug/L | Sep |
| Copper, potentially dissolved | daily maximum | ≤ 28 ug/L | Oct |
| Copper, potentially dissolved | daily maximum | ≤ 22 ug/L | Nov |
| Copper, potentially dissolved | daily maximum | ≤ 18 ug/L | Dec |
| Arsenic, potentially dissolved | daily maximum | report only (ug/L) | all year |
| Cadmium, potentially dissolvd | 30-day average | ≤ 1.7 ug/L | Feb |
| Cadmium, potentially dissolvd | 30-day average | ≤ 1.7 ug/L | Mar |
| Cadmium, potentially dissolvd | 30-day average | ≤ 1.7 ug/L | Jan |
| Cadmium, potentially dissolvd | 30-day average | ≤ 1.6 ug/L | Apr |
| Cadmium, potentially dissolvd | 30-day average | ≤ 1.6 ug/L | May |
| Cadmium, potentially dissolvd | 30-day average | ≤ 1.6 ug/L | Jun |
| Cadmium, potentially dissolvd | 30-day average | ≤ 2.1 ug/L | Jul |
| Cadmium, potentially dissolvd | 30-day average | ≤ 2.1 ug/L | Aug |
| Cadmium, potentially dissolvd | 30-day average | ≤ 2.1 ug/L | Sep |
| Cadmium, potentially dissolvd | 30-day average | ≤ 1.7 ug/L | Oct |
| Cadmium, potentially dissolvd | 30-day average | ≤ 1.7 ug/L | Nov |
| Cadmium, potentially dissolvd | 30-day average | ≤ .63 ug/L | Jan |
| Cadmium, potentially dissolvd | 30-day average | ≤ .63 ug/L | Feb |
| Cadmium, potentially dissolvd | 30-day average | ≤ .6 ug/L | Mar |
| Cadmium, potentially dissolvd | 30-day average | ≤ .6 ug/L | Apr |
| Cadmium, potentially dissolvd | 30-day average | ≤ .62 ug/L | May |
| Cadmium, potentially dissolvd | 30-day average | ≤ .89 ug/L | Jun |
| Cadmium, potentially dissolvd | 30-day average | ≤ .75 ug/L | Jul |
| Cadmium, potentially dissolvd | 30-day average | ≤ .82 ug/L | Aug |
| Cadmium, potentially dissolvd | 30-day average | ≤ .87 ug/L | Sep |
| Cadmium, potentially dissolvd | 30-day average | ≤ .89 ug/L | Oct |
| Cadmium, potentially dissolvd | 30-day average | ≤ .69 ug/L | Nov |
| Cadmium, potentially dissolvd | 30-day average | ≤ .63 ug/L | Dec |
| Cadmium, potentially dissolvd | 30-day average | ≤ 1.7 ug/L | Dec |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | Feb |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | Mar |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | Jan |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | Apr |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | May |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | Jun |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | Jul |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | Aug |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | Sep |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | Oct |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | Nov |
| Cadmium, potentially dissolvd | daily maximum | ≤ 2.3 ug/L | Jan |
| Cadmium, potentially dissolvd | daily maximum | ≤ 2.5 ug/L | Feb |
| Cadmium, potentially dissolvd | daily maximum | ≤ 2.4 ug/L | Mar |
| Cadmium, potentially dissolvd | daily maximum | ≤ 2.5 ug/L | Apr |
| Cadmium, potentially dissolvd | daily maximum | ≤ 2.6 ug/L | May |
| Cadmium, potentially dissolvd | daily maximum | ≤ 3.7 ug/L | Jun |
| Cadmium, potentially dissolvd | daily maximum | ≤ 3.1 ug/L | Jul |
| Cadmium, potentially dissolvd | daily maximum | ≤ 3.2 ug/L | Aug |
| Cadmium, potentially dissolvd | daily maximum | ≤ 3 ug/L | Sep |
| Cadmium, potentially dissolvd | daily maximum | ≤ 3.6 ug/L | Oct |
| Cadmium, potentially dissolvd | daily maximum | ≤ 2.8 ug/L | Nov |
| Cadmium, potentially dissolvd | daily maximum | ≤ 2.2 ug/L | Dec |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | Dec |
| Chromium, trivalent, potentially dissolvd | 30-day average | report only (ug/L) | all year |
| Lead, potentially dissolvd | 30-day average | ≤ 3.8 ug/L | Jan |
| Lead, potentially dissolvd | 30-day average | ≤ 3.6 ug/L | Mar |
| Lead, potentially dissolvd | 30-day average | ≤ 3.8 ug/L | Feb |
| Lead, potentially dissolvd | 30-day average | ≤ 3.6 ug/L | Apr |
| Lead, potentially dissolvd | 30-day average | ≤ 3.8 ug/L | May |
| Lead, potentially dissolvd | 30-day average | ≤ 5.4 ug/L | Jun |
| Lead, potentially dissolvd | 30-day average | ≤ 4.6 ug/L | Jul |
| Lead, potentially dissolvd | 30-day average | ≤ 5 ug/L | Aug |
| Lead, potentially dissolvd | 30-day average | ≤ 5.3 ug/L | Sep |
| Lead, potentially dissolvd | 30-day average | ≤ 5.4 ug/L | Oct |
| Lead, potentially dissolvd | 30-day average | ≤ 4.2 ug/L | Nov |
| Lead, potentially dissolvd | 30-day average | ≤ 3.8 ug/L | Dec |
| Lead, potentially dissolvd | daily maximum | ≤ 85 ug/L | Jan |
| Lead, potentially dissolvd | daily maximum | ≤ 94 ug/L | Feb |
| Lead, potentially dissolvd | daily maximum | ≤ 90 ug/L | Mar |
| Lead, potentially dissolvd | daily maximum | ≤ 94 ug/L | Apr |
| Lead, potentially dissolvd | daily maximum | ≤ 97 ug/L | May |
| Lead, potentially dissolvd | daily maximum | ≤ 140 ug/L | Jun |
| Lead, potentially dissolvd | daily maximum | ≤ 118 ug/L | Jul |
| Lead, potentially dissolvd | daily maximum | ≤ 122 ug/L | Aug |
| Lead, potentially dissolvd | daily maximum | ≤ 115 ug/L | Sep |
| Lead, potentially dissolvd | daily maximum | ≤ 135 ug/L | Oct |
| Lead, potentially dissolvd | daily maximum | ≤ 108 ug/L | Nov |
| Lead, potentially dissolvd | daily maximum | ≤ 85 ug/L | Dec |
| Manganese, potentially dissolvd | 30-day average | report only (ug/L) | all year |
| Manganese, potentially dissolvd | daily maximum | report only (ug/L) | all year |
| Nickel, potentially dissolvd | 30-day average | report only (ug/L) | all year |
| Nickel, potentially dissolvd | daily maximum | report only (ug/L) | all year |
| Selenium, potentially dissolvd | 30-day average | report only (ug/L) | all year |
| Selenium, potentially dissolvd | daily maximum | report only (ug/L) | all year |
| Oil and grease | instantaneous maximum | ≤ 10 mg/L | all year |
| Chromium, trivalent total recoverable | daily maximum | report only (ug/L) | all year |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .103 MGD | Feb |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .129 MGD | Sep |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .103 MGD | Jan |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .374 MGD | May |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .103 MGD | Nov |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .148 MGD | Apr |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .265 MGD | Jul |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .129 MGD | Mar |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .148 MGD | Aug |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .458 MGD | Jun |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .103 MGD | Oct |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .103 MGD | Dec |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | Feb |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | Sep |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | Jan |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | May |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | Nov |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | Apr |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | Jul |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | Mar |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | Aug |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | Jun |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | Oct |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | Dec |
| Mercury, total [low level] | 30-day average | report only (ug/L) | all year |
| Mercury, total [low level] | daily maximum | report only (ug/L) | all year |
| Sulfide-hydrogen sulfide [undissociated] | 30-day average | report only (mg/L) | all year |
| Mercury, total [as Hg] | 30-day average | ≤ 1 ug/L | all year |
| Mercury, total [as Hg] | daily maximum | ≤ 2 ug/L | all year |
| Oil and grease visual | instantaneous maximum | report only (abst=0;prst=1) | all year |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | single sample | report only (tox chronic) | all year |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | report only (tox chronic) | all year |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | ≥ 52 tox chronic | Jun |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | ≥ 53 tox chronic | Sep |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | ≥ 52 tox chronic | Dec |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | ≥ 73 tox chronic | Mar |
| Static Renewal 7 Day Chronic Pimephales promelas | single sample | report only (tox chronic) | all year |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | report only (tox chronic) | all year |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | ≥ 52 tox chronic | Jun |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | ≥ 53 tox chronic | Sep |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | ≥ 52 tox chronic | Dec |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | ≥ 73 tox chronic | Mar |
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/CO0032751 · MCP: https://passage-data.com/mcp