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Water Supply, Milliken, Colorado. NPDES permit CO0046485 expired Dec 31, 2020; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | maximum weekly average | report only (deg C) | all year | 001 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 001 |
| Conductivity | 30-day average | report only (dS/m) | all year | 001 |
| Conductivity | daily maximum | report only (dS/m) | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Bicarbonate ion- [as HCO3] | 30-day average | report only (mg/L) | all year | 001 |
| Bicarbonate ion- [as HCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | maximum 7-day average | ≤ 45 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, inorganic total | daily maximum | report only (mg/L) | all year | 001 |
| Cyanide, weak acid, dissociable | daily maximum | report only (ug/L) | all year | 001 |
| Calcium, total recoverable | 30-day average | report only (mg/L) | all year | 001 |
| Calcium, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Magnesium, total recoverable | 30-day average | report only (mg/L) | all year | 001 |
| Magnesium, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Sodium, total recoverable | 30-day average | report only (mg/L) | all year | 001 |
| Sodium, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Sodium adsorption ratio | 30-day average | report only (Ratio) | all year | 001 |
| Sodium adsorption ratio | daily maximum | report only (Ratio) | all year | 001 |
| Sodium adsorption ratio | 30-day average | report only (Ratio) | all year | 001 |
| Sodium adsorption ratio | daily maximum | report only (Ratio) | all year | 001 |
| Chloride [as Cl] | 30-day average | report only (mg/L) | all year | 001 |
| Arsenic, total recoverable | 30-day average | ≤ 10 ug/L | all year | 001 |
| Arsenic, total recoverable | 30-day average | ≤ 1.2 ug/L | all year | 001 |
| Iron, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Iron, dissolved [as Fe] | 30-day average | report only (ug/L) | all year | 001 |
| Manganese, dissolved [as Mn] | 30-day average | report only (ug/L) | all year | 001 |
| Nickel, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Molybdenum, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Molybdenum, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Chromium, hexavalent dissolved [as Cr] | 30-day average | report only (ug/L) | all year | 001 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | report only (ug/L) | all year | 001 |
| Chromium, hexavalent dissolved [as Cr] | rolling average | report only (ug/L) | all year | 001 |
| Zinc, potentially dissolved | 30-day average | report only (ug/L) | all year | 001 |
| Zinc, potentially dissolved | daily maximum | report only (ug/L) | all year | 001 |
| Silver, potentially dissolved | 30-day average | report only (ug/L) | all year | 001 |
| Silver, potentially dissolved | daily maximum | report only (ug/L) | all year | 001 |
| Copper, potentially dissolved | 30-day average | report only (ug/L) | all year | 001 |
| Copper, potentially dissolved | daily maximum | report only (ug/L) | all year | 001 |
| Copper, potentially dissolved | rolling average | report only (ug/L) | all year | 001 |
| Arsenic, potentially dissolved | daily maximum | report only (ug/L) | all year | 001 |
| Cadmium, potentially dissolvd | 30-day average | ≤ 6 ug/L | all year | 001 |
| Cadmium, potentially dissolvd | 30-day average | report only (ug/L) | all year | 001 |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | all year | 001 |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | all year | 001 |
| Chromium, trivalent, potentially dissolvd | 30-day average | report only (ug/L) | all year | 001 |
| Lead, potentially dissolvd | 30-day average | report only (ug/L) | all year | 001 |
| Lead, potentially dissolvd | daily maximum | report only (ug/L) | all year | 001 |
| Manganese, potentially dissolvd | 30-day average | report only (ug/L) | all year | 001 |
| Manganese, potentially dissolvd | daily maximum | report only (ug/L) | all year | 001 |
| Nickel, potentially dissolvd | 30-day average | report only (ug/L) | all year | 001 |
| Nickel, potentially dissolvd | daily maximum | report only (ug/L) | all year | 001 |
| Selenium, potentially dissolvd | 30-day average | ≤ 12.3 ug/L | all year | 001 |
| Selenium, potentially dissolvd | 30-day average | ≤ 12.3 ug/L | all year | 001 |
| Selenium, potentially dissolvd | daily maximum | ≤ 43 ug/L | all year | 001 |
| Selenium, potentially dissolvd | daily maximum | ≤ 18 ug/L | all year | 001 |
| Selenium, potentially dissolvd | rolling average | ≤ 12 ug/L | all year | 001 |
| Oil and grease | instantaneous maximum | ≤ 10 mg/L | all year | 001 |
| Chromium, trivalent total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Uranium, total | 30-day average | report only (ug/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .7 MGD | all year | 001 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .31 MGD | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Mercury, total [low level] | 30-day average | report only (ug/L) | all year | 001 |
| E. coli | 30-day geometric mean | report only (#/100mL) | all year | 001 |
| E. coli | maximum 7-day geometric mean | report only (#/100mL) | all year | 001 |
| Sulfide-hydrogen sulfide [undissociated] | 30-day average | report only (mg/L) | all year | 001 |
| Sulfide-hydrogen sulfide [undissociated] | 30-day average | ≤ .31 mg/L | all year | 001 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 001 |
| Solids, total dissolved | daily maximum | ≤ 3500 mg/L | all year | 001 |
| Mercury, total [as Hg] | 30-day average | ≤ .05 ug/L | all year | 001 |
| Sulfate | 30-day average | report only (mg/L) | all year | 001 |
| Sulfate | 30-day average | ≤ 1620 mg/L | all year | 001 |
| Boron, total | 30-day average | report only (mg/L) | all year | 001 |
| Oil and grease visual | instantaneous maximum | report only (abst=0;prst=1) | all year | 001 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | single reading | report only (tox chronic) | all year | 001 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | report only (tox chronic) | all year | 001 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | ≥ 18 tox chronic | all year | 001 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | ≥ 9 tox chronic | all year | 001 |
| Static Renewal 7 Day Chronic Pimephales promelas | single sample | report only (tox chronic) | all year | 001 |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | report only (tox chronic) | all year | 001 |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | ≥ 18 tox chronic | all year | 001 |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | ≥ 9 tox chronic | all year | 001 |
| Temperature, water deg. centigrade | maximum weekly average | report only (deg C) | all year | UST |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | UST |
Cited limits by parameter: Colorado's rules and the federal ones.
Same industry: the 13 Water Supply 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/CO0046485 · MCP: https://passage-data.com/mcp