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Nonresidential Building Operators, Denver, Colorado. NPDES permit CO0000008 expired Sep 30, 2018; 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 |
| Chloride [as Cl] | 30-day average | report only (mg/L) | all year |
| Arsenic, total recoverable | 30-day average | ≤ 3 ug/L | all year |
| Boron, total [as B] | 30-day average | report only (mg/L) | all year |
| Iron, dissolved [as Fe] | 30-day average | ≤ 300 ug/L | all year |
| Iron, dissolved [as Fe] | 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 |
| Manganese, potentially dissolvd | 30-day average | report only (ug/L) | all year |
| Manganese, potentially dissolvd | daily maximum | report only (ug/L) | all year |
| Selenium, potentially dissolvd | 30-day average | ≤ 5.1 ug/L | all year |
| Selenium, potentially dissolvd | 30-day average | ≤ 4.6 ug/L | all year |
| Selenium, potentially dissolvd | daily maximum | 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 |
| Radium 226 + radium 228, total | 30-day average | report only (pCi/L) | all year |
| Benzene | 30-day average | report only (ug/L) | all year |
| Tetrachloroethylene | 30-day average | report only (ug/L) | all year |
| Vinyl chloride | 30-day average | ≤ 42 ug/L | all year |
| Mercury, total [as Hg] | 30-day average | report only (ug/L) | all year |
| Sulfate | 30-day average | report only (mg/L) | all year |
| Oil and grease visual | instantaneous maximum | report only (abst=0;prst=1) | all year |
| LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia | minimum value | ≥ 100 % | all year |
| LC50 Static Renewal 96Hr Acute Pimephales promelas | minimum value | ≥ 100 % | all year |
Cited limits by parameter: Colorado's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/CO0000008 · MCP: https://passage-data.com/mcp