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Petroleum Refining, major discharger, Ponca City, Oklahoma. NPDES permit OK0000256, in force until Jan 31, 2031. Last 12 months: over a limit once (last June 2026), 7 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| June 2026 | Oil and grease, hexane extr method, daily maximum | < 26 mg/L | ≤ 15 mg/L | 73% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | monthly average | ≤ 26.3 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 39.5 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 1054 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 1581 lb/d | all year | 001 |
| Oxygen demand, chem. [high level] [COD] | monthly average | ≤ 279 mg/L | all year | 001 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 539 mg/L | all year | 001 |
| Oxygen demand, chem. [high level] [COD] | monthly average | ≤ 10337 lb/d | all year | 001 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 19947 lb/d | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 32 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 50.2 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 1186 lb/d | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 1860 lb/d | all year | 001 |
| Oil and grease, hexane extr method | monthly average | ≤ 11.7 mg/L | all year | 001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 21.9 mg/L | all year | 001 |
| Oil and grease, hexane extr method | monthly average | ≤ 432 lb/d | all year | 001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 811 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 13.2 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19.8 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 529 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 794 lb/d | all year | 001 |
| Sulfide, total [as S] | monthly average | ≤ .2 mg/L | all year | 001 |
| Sulfide, total [as S] | daily maximum | ≤ .46 mg/L | all year | 001 |
| Sulfide, total [as S] | monthly average | ≤ 7.53 lb/d | all year | 001 |
| Sulfide, total [as S] | daily maximum | ≤ 16.89 lb/d | all year | 001 |
| Selenium, total [as Se] | monthly average | ≤ 70.7 mg/L | all year | 001 |
| Selenium, total [as Se] | daily maximum | ≤ 97.8 mg/L | all year | 001 |
| Selenium, total [as Se] | monthly average | ≤ 2.62 lb/d | all year | 001 |
| Selenium, total [as Se] | daily maximum | ≤ 3.42 lb/d | all year | 001 |
| Phenolics, total recoverable | monthly average | ≤ .26 mg/L | all year | 001 |
| Phenolics, total recoverable | daily maximum | ≤ .54 mg/L | all year | 001 |
| Phenolics, total recoverable | monthly average | ≤ 9.69 lb/d | all year | 001 |
| Phenolics, total recoverable | daily maximum | ≤ 19.92 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 |
| Solids, total dissolved- 180 deg. C | monthly average | report only (mg/L) | all year | 001 |
| Solids, total dissolved- 180 deg. C | daily maximum | report only (mg/L) | all year | 001 |
| Oxygen demand, chem. [high level] [COD] | daily average | report only (mg/L) | all year | 002 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 120 mg/L | all year | 002 |
| pH | minimum | ≥ 6.5 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | daily average | report only (mg/L) | all year | 002 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 002 |
| Oil and grease, hexane extr method | daily average | report only (mg/L) | all year | 002 |
| Oil and grease, hexane extr method | 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 |
| Oxygen demand, chem. [high level] [COD] | daily average | report only (mg/L) | all year | 003 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 95 mg/L | all year | 003 |
| pH | minimum | ≥ 6.5 SU | all year | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | daily average | report only (mg/L) | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 003 |
| Oil and grease, hexane extr method | daily average | report only (mg/L) | all year | 003 |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 mg/L | all year | 003 |
| Copper, total [as Cu] | monthly average | report only (ug/L) | all year | 003 |
| Copper, total [as Cu] | daily maximum | report only (ug/L) | all year | 003 |
| Lead, total [as Pb] | monthly average | report only (ug/L) | all year | 003 |
| Lead, total [as Pb] | daily maximum | report only (ug/L) | all year | 003 |
| Selenium, total [as Se] | monthly average | report only (ug/L) | all year | 003 |
| Selenium, total [as Se] | daily maximum | report only (ug/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 | daily minimum | report only (SU) | all year | TX1 |
| pH | daily minimum | report only (SU) | all year | TX1 |
| pH | daily maximum | 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] | 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 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | 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 | 48-hour minimum | report only (pass=0;fail=1) | all year | TX1 |
| Whole Effluent Toxicity [WET] - D. magna | 48-hour 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 |
| LC50 Static Renewal 48Hr Acute Daphnia magna | 48-hour minimum | report only (%) | all year | TX1 |
| LC50 Static Renewal 48Hr Acute Pimephales promelas | 48-hour minimum | report only (%) | all year | TX1 |
| LC50 Static Renewal 48Hr Acute Pimephales promelas | 48-hour minimum | report only (%) | all year | TX1 |
| LF Pass/Fail Static Renewal 48Hr Acute Daphnia magna | 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 |
| LC50 Static Renewal 48Hr Acute Pimephales promelas | 48-hour minimum | report only (pass=0;fail=1) | all year | TX1 |
| Daphnia Magna % Mortality 48 Hr Acute | 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 Static Renewal 48 Hr Pimephales promelas or use TJA6C | 48-hour minimum | report only (%) | all year | TX1 |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Lead, total [as Pb], daily maximum | 17.5 ug/L | new | 76 ug/L (5 values) | 4.34× |
| Lead, total [as Pb], monthly average | 10.5 ug/L | new | 47 ug/L (5 values) | 4.48× |
| Copper, total [as Cu], daily maximum | 42.2 ug/L | new | 34 ug/L (5 values) | 0.806× |
| Copper, total [as Cu], monthly average | 28.8 ug/L | new | 19.7 ug/L (5 values) | 0.684× |
| Selenium, total [as Se], daily maximum | 8.3 ug/L | new | 2.6 ug/L (5 values) | 0.313× |
| Selenium, total [as Se], monthly average | 4.7 ug/L | new | 2.6 ug/L (5 values, 2 below detection) | 0.553× |
Cited limits by parameter: Oklahoma's rules and the federal ones.
Same industry: the 6 Petroleum Refining and Related Industries permits in Oklahoma.
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On EPA ECHO: Facility report · DMR history
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