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Federal facility (Commercial Physical Research), Oklahoma City, Oklahoma. NPDES permit OK0043931 expired May 31, 2022; its limits still apply. Last 12 months: over a limit once (last January 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| January 2026 | Solids, total dissolved [TDS], daily maximum | 1640 mg/L | ≤ 1573 mg/L | 4% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (gal/d) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (gal/d) | all year | 001 |
| Solids, total dissolved [TDS] | monthly average | ≤ 1421 mg/L | all year | 001 |
| Solids, total dissolved [TDS] | daily maximum | ≤ 1573 mg/L | all year | 001 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 002 |
| pH | minimum | ≥ 6.5 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (gal/d) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (gal/d) | all year | 002 |
| pH | minimum | ≥ 6.5 SU | all year | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| Chloride [as Cl] | monthly average | ≤ 367 mg/L | all year | 003 |
| Chloride [as Cl] | daily maximum | ≤ 420 mg/L | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (gal/d) | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (gal/d) | all year | 003 |
| Solids, total dissolved [TDS] | monthly average | ≤ 1433 mg/L | all year | 003 |
| Solids, total dissolved [TDS] | daily maximum | ≤ 1605 mg/L | all year | 003 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 004 |
| pH | minimum | ≥ 6.5 SU | all year | 004 |
| pH | maximum | ≤ 9 SU | all year | 004 |
| Flow, in conduit or thru treatment plant | monthly average | report only (gal/d) | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (gal/d) | all year | 004 |
Cited limits by parameter: Oklahoma'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/OK0043931 · MCP: https://passage-data.com/mcp