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Water Supply, Weld County, Colorado. NPDES permit CO0046477 expired Aug 31, 2017; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| 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 | maximum 7-day average | ≤ 45 mg/L | all year |
| Nitrogen, nitrite total [as N] | 30-day average | report only (mg/L) | all year |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, nitrate total [as N] | 30-day average | report only (mg/L) | all year |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | all year |
| Cyanide, weak acid, dissociable | daily maximum | report only (ug/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 |
| Iron, dissolved [as Fe] | 30-day average | report only (ug/L) | all year |
| Iron, dissolved [as Fe] | daily maximum | report only (ug/L) | all year |
| Manganese, dissolved [as Mn] | 30-day average | report only (ug/L) | all year |
| Manganese, dissolved [as Mn] | daily maximum | report only (ug/L) | all year |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year |
| Zinc, potentially dissolved | 30-day average | report only (ug/L) | all year |
| Zinc, potentially dissolved | daily maximum | report only (ug/L) | all year |
| Silver, potentially dissolved | 30-day average | report only (ug/L) | all year |
| Silver, potentially dissolved | daily maximum | report only (ug/L) | all year |
| Copper, potentially dissolved | 30-day average | report only (ug/L) | all year |
| Copper, potentially dissolved | daily maximum | report only (ug/L) | all year |
| Cadmium, potentially dissolvd | 30-day average | report only (ug/L) | all year |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | all year |
| Lead, potentially dissolvd | 30-day average | report only (ug/L) | all year |
| Lead, 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 | ≤ .046 MGD | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Mercury, total [as Hg] | 30-day average | report only (ug/L) | all year |
| Oil and grease visual | instantaneous maximum | report only (N=0;Y=1) | all year |
| LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia | minimum value | ≥ 1 % | Dec |
| LC50 Static Renewal 96Hr Acute Pimephales promelas | minimum value | ≥ 1 % | Dec |
Cited limits by parameter: Colorado's rules and the federal ones.
Same industry: the 13 Water Supply permits in Colorado.
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Your permit document is the final word. As JSON: /api/v1/permits/CO0046477 · MCP: https://passage-data.com/mcp