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Water Supply, Aurora, Colorado. NPDES permit CO0049053 expired Aug 31, 2025; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Aluminum, total recoverable | 30-day average | ≤ 994 ug/L | all year | 001 |
| Aluminum, total recoverable | daily maximum | ≤ 6961 ug/L | all year | 001 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .004211 MGD | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Sulfate | 30-day average | report only (mg/L) | all year | 001 |
| Sulfate | daily maximum | report only (mg/L) | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Aluminum, total recoverable | 30-day average | ≤ 994 ug/L | all year | 002 |
| Aluminum, total recoverable | daily maximum | ≤ 6961 ug/L | all year | 002 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .004443 MGD | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Sulfate | 30-day average | report only (mg/L) | all year | 002 |
| Sulfate | daily maximum | report only (mg/L) | all year | 002 |
| pH | minimum | ≥ 6.5 SU | all year | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| Aluminum, total recoverable | 30-day average | ≤ 994 ug/L | all year | 003 |
| Aluminum, total recoverable | daily maximum | ≤ 6961 ug/L | all year | 003 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .018949 MGD | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| Sulfate | 30-day average | report only (mg/L) | all year | 003 |
| Sulfate | daily maximum | report only (mg/L) | all year | 003 |
| pH | minimum | ≥ 6.5 SU | all year | 004 |
| pH | maximum | ≤ 9 SU | all year | 004 |
| Aluminum, total recoverable | 30-day average | ≤ 994 ug/L | all year | 004 |
| Aluminum, total recoverable | daily maximum | ≤ 6961 ug/L | all year | 004 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .003718 MGD | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| Sulfate | 30-day average | report only (mg/L) | all year | 004 |
| Sulfate | daily maximum | report only (mg/L) | all year | 004 |
| pH | minimum | ≥ 6.5 SU | all year | 005 |
| pH | maximum | ≤ 9 SU | all year | 005 |
| Aluminum, total recoverable | 30-day average | ≤ 994 ug/L | all year | 005 |
| Aluminum, total recoverable | daily maximum | ≤ 6961 ug/L | all year | 005 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .001603 MGD | all year | 005 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 005 |
| Sulfate | 30-day average | report only (mg/L) | all year | 005 |
| Sulfate | daily maximum | report only (mg/L) | all year | 005 |
| pH | minimum | ≥ 6.5 SU | all year | 006 |
| pH | maximum | ≤ 9 SU | all year | 006 |
| Aluminum, total recoverable | 30-day average | ≤ 994 ug/L | all year | 006 |
| Aluminum, total recoverable | daily maximum | ≤ 6961 ug/L | all year | 006 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .004637 MGD | all year | 006 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 006 |
| Sulfate | 30-day average | report only (mg/L) | all year | 006 |
| Sulfate | daily maximum | report only (mg/L) | all year | 006 |
| pH | minimum | ≥ 6.5 SU | all year | 007 |
| pH | maximum | ≤ 9 SU | all year | 007 |
| Aluminum, total recoverable | 30-day average | ≤ 994 ug/L | all year | 007 |
| Aluminum, total recoverable | daily maximum | ≤ 6961 ug/L | all year | 007 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .002232 MGD | all year | 007 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 007 |
| Sulfate | 30-day average | report only (mg/L) | all year | 007 |
| Sulfate | daily maximum | report only (mg/L) | all year | 007 |
| pH | minimum | ≥ 6.5 SU | all year | 008 |
| pH | maximum | ≤ 9 SU | all year | 008 |
| Aluminum, total recoverable | 30-day average | ≤ 994 ug/L | all year | 008 |
| Aluminum, total recoverable | daily maximum | ≤ 6961 ug/L | all year | 008 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .000298 MGD | all year | 008 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 008 |
| Sulfate | 30-day average | report only (mg/L) | all year | 008 |
| Sulfate | daily maximum | report only (mg/L) | all year | 008 |
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/CO0049053 · MCP: https://passage-data.com/mcp