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Nitrogenous Fertilizers, major discharger, Woodward, Oklahoma. NPDES permit OK0036161 expired Sep 30, 2026; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | minimum | ≥ 4 mg/L | Apr–Oct | 001 |
| Oxygen, dissolved [DO] | monthly minimum | ≥ 2 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 227.7 lb/d | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 354.7 lb/d | all year | 001 |
| Oil and grease, hexane extr method | monthly average | ≤ 10 mg/L | all year | 001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 mg/L | all year | 001 |
| Oil and grease, hexane extr method | monthly average | ≤ 78.8 lb/d | all year | 001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 118.2 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 9.6 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 16.5 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 77.5 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 130 lb/d | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 30 lb/d | all year | 001 |
| Phosphorus, total [as P] | daily maximum | ≤ 40 lb/d | all year | 001 |
| Selenium, total [as Se] | monthly average | ≤ 6.4 ug/L | all year | 001 |
| Selenium, total [as Se] | daily maximum | ≤ 15.6 ug/L | all year | 001 |
| Selenium, total [as Se] | monthly average | ≤ .06 lb/d | all year | 001 |
| Selenium, total [as Se] | daily maximum | ≤ .12 lb/d | all year | 001 |
| Oxidants, total residual | daily maximum | ≤ .099 mg/L | 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 |
| Solids, total dissolved | monthly average | ≤ 2079 mg/L | all year | 001 |
| Solids, total dissolved | daily maximum | ≤ 2338 mg/L | all year | 001 |
| Solids, total dissolved | monthly average | ≤ 16385 lb/d | all year | 001 |
| Solids, total dissolved | daily maximum | ≤ 18426 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 40 mg/L | Apr, May | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 36 mg/L | Jun–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 44 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 60 mg/L | Apr, May | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 54 mg/L | Jun–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 66 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 315.3 lb/d | Apr, May | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 283.7 lb/d | Jun–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 346.8 lb/d | Jan, Feb, Mar, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 472.9 lb/d | Apr, May | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 425.6 lb/d | Jun–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 520.2 lb/d | Jan, Feb, Mar, Nov, Dec | 001 |
| Oxygen demand, chem. [high level] [COD] | monthly average | ≤ 84 mg/L | all year | 002 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 125 mg/L | all year | 002 |
| pH | minimum | ≥ 6.5 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Oil and grease, hexane extr method | monthly average | ≤ 10 mg/L | all year | 002 |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 mg/L | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.7 mg/L | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.5 mg/L | 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 |
| pH | daily minimum | report only (SU) | all year | TX1 |
| pH | daily maximum | report only (SU) | all year | TX1 |
| Nitrogen, ammonia total [as N] | daily minimum | report only (mg/L) | all year | TX1 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | TX1 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | TX1 |
| Whole effluent toxicity - retest #1 | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| Whole effluent toxicity - retest #1 | 48-hour 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 | 48-hour 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 |
| LC50 Static Renewal 48Hr Acute Daphnia pulex | 48-hour minimum | report only (%) | all year | TX1 |
| LC50 Static Renewal 48Hr Acute Pimephales promelas | 48-hour minimum | report only (%) | all year | TX1 |
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| LC50 Pass/Fail Static Renewal 48Hr Acute Daphnia Pulex | 48-hour minimum | report only (pass=0;fail=1) | all year | TX1 |
| LC50 Static Renewal 48Hr Acute Pimephales promelas | 48-hour minimum | report only (pass=0;fail=1) | all year | TX1 |
| %Mortality Static Renewal 48Hr Acute Daphnia Pulex | 48-hour minimum | report only (%) | all year | TX1 |
| % Mortality Static Renewal 48 Hr Pimephales promelas or use TJA6C | 48-hour minimum | report only (%) | all year | TX1 |
| %Mortality 7Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (%) | all year | TX1 |
| %Mortality Static Renewal 7Day Chronic Pimephales Promelas | 7-day minimum | report only (%) | all year | TX1 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (pass=0;fail=1) | 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 |
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (%) | 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 Ceriodaphnia dubia | 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 Ceriodaphnia dubia | 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 |
Cited limits by parameter: Oklahoma's rules and the federal ones.
Same industry: the 11 Chemicals and Allied Products permits in Oklahoma.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/OK0036161 · MCP: https://passage-data.com/mcp