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Petroleum Refining, major discharger, Ardmore, Oklahoma. NPDES permit OK0001295, in force until Feb 28, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen demand, chem. [high level] [COD] | monthly average | report only (mg/L) | all year | 001 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 95 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 | report only (mg/L) | all year | 001 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 001 |
| Oil and grease, hexane extr method | monthly average | report only (mg/L) | all year | 001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 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 |
| Oxygen demand, chem. [high level] [COD] | monthly average | report only (mg/L) | all year | 004 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 95 mg/L | all year | 004 |
| pH | minimum | ≥ 6.5 SU | all year | 004 |
| pH | maximum | ≤ 9 SU | all year | 004 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 004 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 004 |
| Oil and grease, hexane extr method | monthly average | report only (mg/L) | all year | 004 |
| Oil and grease, hexane extr method | 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 |
| Oxygen demand, chem. [high level] [COD] | monthly average | report only (mg/L) | all year | 005 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 95 mg/L | all year | 005 |
| pH | minimum | ≥ 6.5 SU | all year | 005 |
| pH | maximum | ≤ 9 SU | all year | 005 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 005 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 005 |
| Oil and grease, hexane extr method | monthly average | report only (mg/L) | all year | 005 |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 mg/L | all year | 005 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 005 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 005 |
| Oxygen demand, chem. [high level] [COD] | monthly average | report only (mg/L) | all year | 006 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 95 mg/L | all year | 006 |
| pH | minimum | ≥ 6.5 SU | all year | 006 |
| pH | maximum | ≤ 9 SU | all year | 006 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 006 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 006 |
| Oil and grease, hexane extr method | monthly average | report only (mg/L) | all year | 006 |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 mg/L | all year | 006 |
| Copper, total [as Cu] | monthly average | report only (ug/L) | all year | 006 |
| Copper, total [as Cu] | daily maximum | report only (ug/L) | all year | 006 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 006 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 006 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 50 mg/L | Jun–Oct | 007 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 71.8 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec | 007 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 75 mg/L | Jun–Oct | 007 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 129.3 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec | 007 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 676 lb/d | Jun–Oct | 007 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 1419 lb/d | Jan, Feb, Mar, Apr, May, Nov, Dec | 007 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 1013 lb/d | Jun–Oct | 007 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 2128 lb/d | Jan, Feb, Mar, Apr, May, Nov, Dec | 007 |
| Oxygen demand, chem. [high level] [COD] | monthly average | ≤ 502 mg/L | all year | 007 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 967 mg/L | all year | 007 |
| Oxygen demand, chem. [high level] [COD] | monthly average | ≤ 7237 lb/d | all year | 007 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 13948 lb/d | all year | 007 |
| pH | minimum | ≥ 6.5 SU | all year | 007 |
| pH | maximum | ≤ 9 SU | all year | 007 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 007 |
| Solids, total suspended | daily maximum | ≤ 46 mg/L | all year | 007 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 007 |
| Solids, total suspended | daily maximum | ≤ 623 lb/d | all year | 007 |
| Oil and grease, hexane extr method | monthly average | report only (mg/L) | all year | 007 |
| Oil and grease, hexane extr method | daily maximum | ≤ 15 mg/L | all year | 007 |
| Oil and grease, hexane extr method | daily maximum | ≤ 216 lb/d | all year | 007 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 20 mg/L | Jun–Oct | 007 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 39.1 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec | 007 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30 mg/L | Jun–Oct | 007 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 85.5 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec | 007 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 270 lb/d | Jun–Oct | 007 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 770 lb/d | Jan, Feb, Mar, Apr, May, Nov, Dec | 007 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 405 lb/d | Jun–Oct | 007 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1155 lb/d | Jan, Feb, Mar, Apr, May, Nov, Dec | 007 |
| Sulfide, total [as S] | monthly average | ≤ .38 mg/L | all year | 007 |
| Sulfide, total [as S] | daily maximum | ≤ .85 mg/L | all year | 007 |
| Sulfide, total [as S] | monthly average | ≤ 5.46 lb/d | all year | 007 |
| Sulfide, total [as S] | daily maximum | ≤ 12.2 lb/d | all year | 007 |
| Chromium, hexavalent [as Cr] | monthly average | ≤ .05 mg/L | all year | 007 |
| Chromium, hexavalent [as Cr] | daily maximum | ≤ .11 mg/L | all year | 007 |
| Chromium, hexavalent [as Cr] | monthly average | ≤ .7 lb/d | all year | 007 |
| Chromium, hexavalent [as Cr] | daily maximum | ≤ 1.58 lb/d | all year | 007 |
| Chromium, total [as Cr] | monthly average | ≤ .59 mg/L | all year | 007 |
| Chromium, total [as Cr] | daily maximum | ≤ 1.71 mg/L | all year | 007 |
| Chromium, total [as Cr] | monthly average | ≤ 8.54 lb/d | all year | 007 |
| Chromium, total [as Cr] | daily maximum | ≤ 24.6 lb/d | all year | 007 |
| Lead, total [as Pb] | daily maximum | report only (ug/L) | all year | 007 |
| Selenium, total [as Se] | daily maximum | report only (ug/L) | all year | 007 |
| Phenolics, total recoverable | monthly average | ≤ .47 mg/L | all year | 007 |
| Phenolics, total recoverable | daily maximum | ≤ .97 mg/L | all year | 007 |
| Phenolics, total recoverable | monthly average | ≤ 6.78 lb/d | all year | 007 |
| Phenolics, total recoverable | daily maximum | ≤ 13.9 lb/d | all year | 007 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 007 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 007 |
| pH | daily minimum | report only (SU) | all year | TX7 |
| pH | daily maximum | report only (SU) | all year | TX7 |
| Nitrogen, ammonia total [as N] | daily minimum | report only (mg/L) | all year | TX7 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | TX7 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | TX7 |
| Whole effluent toxicity - retest #1 | 48-hour minimum | report only (pass=0;fail=1) | all year | TX7 |
| Whole effluent toxicity - retest #2 | 48-hour minimum | report only (pass=0;fail=1) | all year | TX7 |
| Solids, total dissolved- 180 deg. C | daily minimum | report only (mg/L) | all year | TX7 |
| Solids, total dissolved- 180 deg. C | monthly average | report only (mg/L) | all year | TX7 |
| Solids, total dissolved- 180 deg. C | daily maximum | report only (mg/L) | all year | TX7 |
| LC50 Static Renewal 48Hr Acute Daphnia magna | 48-hour minimum | report only (%) | all year | TX7 |
| LC50 Static Renewal 48Hr Acute Pimephales promelas | 48-hour minimum | report only (%) | all year | TX7 |
| LF Pass/Fail Static Renewal 48Hr Acute Daphnia magna | 48-hour minimum | report only (pass=0;fail=1) | all year | TX7 |
| LC50 Static Renewal 48Hr Acute Pimephales promelas | 48-hour minimum | report only (pass=0;fail=1) | all year | TX7 |
| Daphnia Magna % Mortality 48 Hr Acute | 48-hour minimum | report only (%) | all year | TX7 |
| % Mortality Static Renewal 48 Hr Pimephales promelas or use TJA6C | 48-hour minimum | report only (%) | all year | TX7 |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Copper, total [as Cu], daily maximum | 87.7 ug/L | new | — | — |
| Copper, total [as Cu], monthly average | 50.6 ug/L | new | — | — |
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
Your permit document is the final word. As JSON: /api/v1/permits/OK0001295 · MCP: https://passage-data.com/mcp