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Water Supply, Stillwater, Oklahoma. NPDES permit OK0044512, in force until Oct 31, 2029. Last 12 months: no values over a limit, 2 of 22 reports late. 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 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 14 lb/d | all year | 001 |
| Iron, dissolved [as Fe] | monthly average | ≤ 1 mg/L | all year | 001 |
| Iron, dissolved [as Fe] | daily maximum | ≤ 2 mg/L | all year | 001 |
| Iron, dissolved [as Fe] | monthly average | ≤ .7 lb/d | all year | 001 |
| Manganese, dissolved [as Mn] | monthly average | ≤ 1 mg/L | all year | 001 |
| Manganese, dissolved [as Mn] | daily maximum | ≤ 2 mg/L | all year | 001 |
| Manganese, dissolved [as Mn] | monthly average | ≤ .7 lb/d | all year | 001 |
| Aluminum, dissolved [as Al] | monthly average | ≤ 1 mg/L | all year | 001 |
| Aluminum, dissolved [as Al] | daily maximum | ≤ 2 mg/L | all year | 001 |
| Aluminum, dissolved [as Al] | monthly average | ≤ .7 lb/d | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | instantaneous maximum | ≤ .99 mg/L | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 002 |
| Solids, total suspended | monthly average | ≤ 14 lb/d | all year | 002 |
| Iron, dissolved [as Fe] | monthly average | ≤ 1 mg/L | all year | 002 |
| Iron, dissolved [as Fe] | daily maximum | ≤ 2 mg/L | all year | 002 |
| Iron, dissolved [as Fe] | monthly average | ≤ .7 lb/d | all year | 002 |
| Manganese, dissolved [as Mn] | monthly average | ≤ 1 mg/L | all year | 002 |
| Manganese, dissolved [as Mn] | daily maximum | ≤ 2 mg/L | all year | 002 |
| Manganese, dissolved [as Mn] | monthly average | ≤ .7 lb/d | all year | 002 |
| Aluminum, dissolved [as Al] | monthly average | ≤ 1 mg/L | all year | 002 |
| Aluminum, dissolved [as Al] | daily maximum | ≤ 2 mg/L | all year | 002 |
| Aluminum, dissolved [as Al] | monthly average | ≤ .7 lb/d | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Chlorine, total residual | instantaneous maximum | ≤ .99 mg/L | all year | 002 |
Cited limits by parameter: Oklahoma's rules and the federal ones.
Same industry: the 49 Water Supply permits in Oklahoma.
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Your permit document is the final word. As JSON: /api/v1/permits/OK0044512 · MCP: https://passage-data.com/mcp