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Petroleum Refining, major discharger, Smackover, Arkansas. NPDES permit AR0000591 expired Dec 31, 2023; its limits still apply. Last 12 months: over a limit 16 times (last May 2026), 2 required values missing, 1 of 25 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Oil & Grease, daily maximum | 15.1 mg/L | ≤ 15 mg/L | 1% |
| December 2025 | Nitrogen, ammonia total [as N], daily maximum | 22.6 mg/L | ≤ 22.5 mg/L | 0% |
| December 2025 | Nitrogen, ammonia total [as N], daily maximum | 75.78 lb/d | ≤ 55.73 lb/d | 36% |
| December 2025 | Nitrogen, ammonia total [as N], monthly average | 46.17 lb/d | ≤ 37.15 lb/d | 24% |
| December 2025 | Oil & Grease, daily maximum | 110.94 lb/d | ≤ 79.94 lb/d | 39% |
| December 2025 | Oil & Grease, daily maximum | 29 mg/L | ≤ 15 mg/L | 93% |
| December 2025 | Oil & Grease, monthly average | 13.97 mg/L | ≤ 10 mg/L | 40% |
| December 2025 | Oil & Grease, monthly average | 45.17 lb/d | ≤ 42.03 lb/d | 7% |
| January 2026 | Oil & Grease, daily maximum | 23 mg/L | ≤ 15 mg/L | 53% |
| January 2026 | Oil & Grease, monthly average | 13.68 mg/L | ≤ 10 mg/L | 37% |
| January 2026 | Oil & Grease, monthly average | 44.13 lb/d | ≤ 42.03 lb/d | 5% |
| February 2026 | Oil & Grease, daily maximum | 206.33 lb/d | ≤ 79.94 lb/d | 158% |
| February 2026 | Oil & Grease, daily maximum | 49.8 mg/L | ≤ 15 mg/L | 232% |
| February 2026 | Oil & Grease, monthly average | 21.06 mg/L | ≤ 10 mg/L | 111% |
| February 2026 | Oil & Grease, monthly average | 68.91 lb/d | ≤ 42.03 lb/d | 64% |
| May 2026 | Solids, total suspended, daily maximum | 180.76 lb/d | ≤ 175.14 lb/d | 3% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 4 mg/L | May–Oct | 001 |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 3.2 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Oxygen demand, chem. [high level] [COD] | monthly average | report only (mg/L) | all year | 001 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | report only (mg/L) | all year | 001 |
| Oxygen demand, chem. [high level] [COD] | monthly average | ≤ 925.41 lb/d | all year | 001 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 1784.11 lb/d | all year | 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 | report only (mg/L) | all year | 001 |
| Solids, total suspended | monthly average | ≤ 112.2 lb/d | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 175.14 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 | ≤ 42.03 lb/d | all year | 001 |
| Oil & Grease | daily maximum | ≤ 79.94 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 15 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4.2 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 22.5 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.4 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 37.15 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 8.34 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 55.73 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18.66 lb/d | May–Oct | 001 |
| Sulfide, total [as S] | monthly average | report only (mg/L) | all year | 001 |
| Sulfide, total [as S] | daily maximum | report only (mg/L) | all year | 001 |
| Sulfide, total [as S] | monthly average | ≤ .71 lb/d | all year | 001 |
| Sulfide, total [as S] | daily maximum | ≤ 1.57 lb/d | all year | 001 |
| Chromium, total [as Cr] | monthly average | report only (ug/L) | all year | 001 |
| Chromium, total [as Cr] | daily maximum | report only (ug/L) | all year | 001 |
| Chromium, total [as Cr] | monthly average | ≤ .7123 lb/d | all year | 001 |
| Chromium, total [as Cr] | daily maximum | ≤ 20.393 lb/d | all year | 001 |
| Lead, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Lead, total recoverable | monthly average | report only (lb/d) | all year | 001 |
| Lead, total recoverable | daily maximum | report only (lb/d) | all year | 001 |
| Chromium, hexavalent dissolved [as Cr] | monthly average | report only (ug/L) | May–Oct | 001 |
| Chromium, hexavalent dissolved [as Cr] | monthly average | report only (ug/L) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | report only (ug/L) | May–Oct | 001 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | report only (ug/L) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Chromium, hexavalent dissolved [as Cr] | monthly average | ≤ .0381 lb/d | May–Oct | 001 |
| Chromium, hexavalent dissolved [as Cr] | monthly average | ≤ .0618 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | ≤ .077 lb/d | May–Oct | 001 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | ≤ .1369 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Phenolics, total recoverable | monthly average | report only (mg/L) | all year | 001 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Phenolics, total recoverable | monthly average | ≤ .608 lb/d | all year | 001 |
| Phenolics, total recoverable | daily maximum | ≤ 2.4142 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 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 12 mg/L | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 18 mg/L | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 23.82 lb/d | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 74.31 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 35.73 lb/d | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 111.46 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| pH | minimum | ≥ 6 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 002 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 002 |
| Carbon, tot organic [TOC] | daily maximum | ≤ 110 mg/L | all year | 002 |
| Lead, total recoverable | daily maximum | report only (ug/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 SU | all year | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 003 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 003 |
| Carbon, tot organic [TOC] | daily maximum | ≤ 110 mg/L | all year | 003 |
| Lead, total recoverable | 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 |
| Whole effluent toxicity - retest #1 | 7-day average | report only (pass=0;fail=1) | all year | TX1 |
| Whole effluent toxicity - retest #2 | 7-day average | report only (pass=0;fail=1) | all year | TX1 |
| WET, sublethal retest #1 | 7-day average | report only (pass=0;fail=1) | all year | TX1 |
| WET, sublethal retest #2 | 7-day average | report only (pass=0;fail=1) | all year | TX1 |
| Whole Effluent Toxicity - Retest #3 | 7-day average | report only (pass=0;fail=1) | all year | TX1 |
| Whole Effluent Toxicity, Sub-Lethal Retest #3 | 7-day average | report only (pass=0;fail=1) | all year | TX1 |
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day average | report only (pass=0;fail=1) | all year | TX1 |
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 7-day average | report only (pass=0;fail=1) | all year | TX1 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day average | report only (pass=0;fail=1) | all year | TX1 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 7-day average | report only (pass=0;fail=1) | all year | TX1 |
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day average | report only (%) | all year | TX1 |
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 7-day average | report only (%) | all year | TX1 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day average | report only (%) | all year | TX1 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 7-day average | report only (%) | all year | TX1 |
| Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia | 7-day average | report only (%) | all year | TX1 |
| Coef Of Var Static Renewal 7Day Chronic Pimephales promelas | 7-day average | report only (%) | all year | TX1 |
Cited limits by parameter: Arkansas's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/AR0000591 · MCP: https://passage-data.com/mcp