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Nitrogenous Fertilizers, major discharger, Enid, Oklahoma. NPDES permit OK0021024, in force until Apr 30, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | all year | 001 |
| Oxygen, dissolved [DO] | monthly minimum | report only (mg/L) | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 40 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 60 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 744 lb/d | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 1116 lb/d | all year | 001 |
| Oil & Grease | monthly average | ≤ 10 mg/L | all year | 001 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 001 |
| Oil & Grease | monthly average | ≤ 186 lb/d | all year | 001 |
| Oil & Grease | daily maximum | ≤ 279 lb/d | all year | 001 |
| Nitrogen, organic total [as N] | monthly average | ≤ 261 mg/L | all year | 001 |
| Nitrogen, organic total [as N] | daily maximum | ≤ 488 mg/L | all year | 001 |
| Nitrogen, organic total [as N] | monthly average | ≤ 4855 lb/d | all year | 001 |
| Nitrogen, organic total [as N] | daily maximum | ≤ 9079 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4.14 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.86 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 77 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 183 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 | report only (lb/d) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 2.4 mg/L | all year | 001 |
| Phosphorus, total [as P] | daily maximum | ≤ 3.8 mg/L | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 44.6 lb/d | all year | 001 |
| Phosphorus, total [as P] | daily maximum | ≤ 70.7 lb/d | all year | 001 |
| Cyanide, total [as CN] | monthly average | report only (ug/L) | all year | 001 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 001 |
| Cyanide, total [as CN] | monthly average | report only (lb/d) | all year | 001 |
| Cyanide, total [as CN] | daily maximum | report only (lb/d) | all year | 001 |
| Selenium, total [as Se] | monthly average | report only (ug/L) | all year | 001 |
| Selenium, total [as Se] | daily maximum | report only (ug/L) | all year | 001 |
| Selenium, total [as Se] | monthly average | report only (lb/d) | all year | 001 |
| Selenium, total [as Se] | daily maximum | report only (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 | ≤ .099 mg/L | all year | 001 |
| Solids, total dissolved- 180 deg. C | monthly average | ≤ 4500 mg/L | all year | 001 |
| Solids, total dissolved- 180 deg. C | daily maximum | ≤ 7000 mg/L | all year | 001 |
| Solids, total dissolved- 180 deg. C | monthly average | ≤ 83692 lb/d | all year | 001 |
| Solids, total dissolved- 180 deg. C | daily maximum | ≤ 130187 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 15 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 22.5 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 279 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 418 lb/d | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Oil & Grease | monthly average | ≤ 10 mg/L | all year | 002 |
| Oil & Grease | daily maximum | ≤ 15 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 | minimum | ≥ 6.5 SU | all year | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| Oil & Grease | monthly average | ≤ 10 mg/L | all year | 003 |
| Oil & Grease | 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 | 004 |
| pH | maximum | ≤ 9 SU | all year | 004 |
| Oil & Grease | monthly average | ≤ 10 mg/L | all year | 004 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 004 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 107 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 107 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 107 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 107 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 108 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 108 |
| pH | minimum | report only (SU) | all year | TX1 |
| pH | 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 #2 | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| Whole Effluent Toxicity [WET] - D. magna | minimum | ≥ 100 % | 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 |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Cyanide, total [as CN], daily maximum | 16.76 ug/L | new | 12.75 ug/L (12 values) | 0.761× |
| Cyanide, total [as CN], daily maximum | 0.31 lb/d | new | 0.2 lb/d (12 values) | 0.645× |
| Cyanide, total [as CN], monthly average | 10.33 ug/L | new | 8.415 ug/L (12 values) | 0.815× |
| Cyanide, total [as CN], monthly average | 0.19 lb/d | new | 0.13 lb/d (12 values) | 0.684× |
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/OK0021024 · MCP: https://passage-data.com/mcp