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Industrial Sand, Mill Creek, Oklahoma. NPDES permit OK0035521, in force until Sep 30, 2028. 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 | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | monthly average | ≤ 25 mg/L | all year | 003 |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | all year | 003 |
| Oil and grease, hexane extr method | monthly average | ≤ 10 mg/L | all year | 003 |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 mg/L | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| pH | minimum | ≥ 6.5 SU | all year | 006 |
| pH | maximum | ≤ 9 SU | all year | 006 |
| Solids, total suspended | monthly average | ≤ 25 mg/L | all year | 006 |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | all year | 006 |
| Oil and grease, hexane extr method | monthly average | ≤ 10 mg/L | all year | 006 |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 mg/L | all year | 006 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 006 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 006 |
Cited limits by parameter: Oklahoma's rules and the federal ones.
Same industry: the 14 Mining and Quarrying of Nonmetallic Minerals permits in Oklahoma.
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On EPA ECHO: Facility report · DMR history
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