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Sewage treatment plant, major discharger, Foss, Oklahoma. NPDES permit OK0041491 expired May 31, 2012; its limits still apply. Last 12 months: no values over a limit, 3 of 16 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 |
| 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 | ≤ .099 mg/L | all year | 001 |
| Whole effluent toxicity - retest #1 | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| Whole effluent toxicity - retest #1 | minimum | report only (pass=0;fail=1) | all year | TX1 |
| Whole effluent toxicity - retest #2 | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| Whole effluent toxicity - retest #2 | minimum | report only (pass=0;fail=1) | all year | TX1 |
| Solids, total dissolved- 180 deg. C | daily minimum | report only (mg/L) | all year | TX1 |
| Solids, total dissolved- 180 deg. C | monthly average | report only (mg/L) | all year | TX1 |
| Solids, total dissolved- 180 deg. C | daily maximum | report only (mg/L) | all year | TX1 |
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| %Mortality Static Renewal 7Day Chronic Pimephales Promelas | 7-day minimum | report only (%) | all year | TX1 |
| % Mortality 21 Day Chronic Daphnia Magna | minimum | report only (%) | all year | TX1 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| Pass/Fail Survival 21 Day Chronic Daphnia Magna | minimum | report only (pass=0;fail=1) | all year | TX1 |
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 7-day minimum | report only (%) | all year | TX1 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 7-day minimum | report only (%) | all year | TX1 |
| Coef Of Var Static Renewal 7Day Chronic Pimephales promelas | 7-day minimum | report only (%) | all year | TX1 |
| % Coefficient Of Variation 21 Day Chronic Daphnia Magna | minimum | report only (%) | all year | TX1 |
| LOEC Lethal Survival Static Renewal 21 Day Chronic Daphnia magna | minimum | report only (%) | all year | TX1 |
| LOEC Sub-Lethal Reproduction Static Renewal 21 Day Chronic Daphnia magna | minimum | report only (%) | all year | TX1 |
| Pass/Fail Reproduction 21 Day Chronic Daphnia Magna | minimum | report only (pass=0;fail=1) | all year | TX1 |
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/OK0041491 · MCP: https://passage-data.com/mcp