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Construction Sand And Gravel, Durango, Colorado. NPDES permit CO0035024, in force until Mar 31, 2027. Last 12 months: no values over a limit, 19 required values missing, 6 of 9 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 6 mg/L | all year | 001 |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | 001 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L (alert, not enforceable) | all year | 001 |
| Oil & Grease | 30-day average | ≤ 10 mg/L | all year | 001 |
| Oil & Grease | daily maximum | ≤ 10 mg/L | all year | 001 |
| Nitrogen, nitrite total [as N] | daily maximum | ≤ 10 mg/L | all year | 001 |
| Nitrogen, nitrate total [as N] | daily maximum | ≤ 100 mg/L | all year | 001 |
| Nitrite Plus Nitrate Total | daily maximum | ≤ .68 mg/L (alert, not enforceable) | all year | 001 |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 6 mg/L | all year | 002 |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | 002 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L (alert, not enforceable) | all year | 002 |
| Oil & Grease | 30-day average | ≤ 10 mg/L | all year | 002 |
| Oil & Grease | daily maximum | ≤ 10 mg/L | all year | 002 |
| Nitrogen, nitrite total [as N] | daily maximum | ≤ 10 mg/L | all year | 002 |
| Nitrogen, nitrate total [as N] | daily maximum | ≤ 100 mg/L | all year | 002 |
| Nitrite Plus Nitrate Total | daily maximum | ≤ .68 mg/L (alert, not enforceable) | all year | 002 |
| DMR Attachment Submitted | value | report only (N=0;Y=1) | all year | 003 |
Cited limits by parameter: Colorado's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/CO0035024 · MCP: https://passage-data.com/mcp