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Metal Ores, major discharger, Bauxite, Arkansas. NPDES permit AR0000582 expired Oct 31, 2023; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | minimum | ≥ 6 SU | all year | 008 |
| pH | maximum | ≤ 9 SU | all year | 008 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 008 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 008 |
| Chloride [as Cl] | monthly average | report only (mg/L) | all year | 008 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 008 |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year | 008 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 008 |
| Selenium, total recoverable | monthly average | report only (ug/L) | all year | 008 |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | 008 |
| Iron, total [as Fe] | monthly average | ≤ .5 mg/L | all year | 008 |
| Iron, total [as Fe] | daily maximum | ≤ 1 mg/L | all year | 008 |
| Aluminum, total [as Al] | monthly average | ≤ 1 mg/L | all year | 008 |
| Aluminum, total [as Al] | daily maximum | ≤ 2 mg/L | all year | 008 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 008 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 008 |
| Solids, total dissolved | monthly average | report only (mg/L) | all year | 008 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 008 |
| Streamflow | daily maximum | report only (MGD) | all year | 009 |
| pH | minimum | ≥ 6 SU | all year | 009 |
| pH | maximum | ≤ 9 SU | all year | 009 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 009 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 009 |
| Chloride [as Cl] | monthly average | report only (mg/L) | all year | 009 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 009 |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year | 009 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 009 |
| Selenium, total recoverable | monthly average | ≤ 17.7 ug/L | all year | 009 |
| Selenium, total recoverable | daily maximum | ≤ 35.5 ug/L | all year | 009 |
| Iron, total [as Fe] | monthly average | ≤ .5 mg/L | all year | 009 |
| Iron, total [as Fe] | daily maximum | ≤ 1 mg/L | all year | 009 |
| Aluminum, total [as Al] | monthly average | ≤ 1 mg/L | all year | 009 |
| Aluminum, total [as Al] | daily maximum | ≤ 2 mg/L | all year | 009 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 009 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 009 |
| Solids, total dissolved | monthly average | report only (mg/L) | all year | 009 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 009 |
| Solids, total dissolved | monthly average | report only (lb/d) | all year | 009 |
| Solids, total dissolved [TDS] | daily maximum | ≤ 171.5 lb/CFS/d | all year | 009 |
| Stream flow, instantaneous | monthly average | report only (MGD) | all year | 028 |
| Stream flow, instantaneous | monthly average | report only (MGD) | all year | 028 |
| Stream flow, instantaneous | monthly average | report only (MGD) | all year | 028 |
| Stream flow, instantaneous | monthly average | report only (MGD) | all year | 028 |
| Stream flow, instantaneous | monthly average | report only (MGD) | all year | 028 |
| Stream flow, instantaneous | daily maximum | report only (MGD) | all year | 028 |
| Stream flow, instantaneous | daily maximum | report only (MGD) | all year | 028 |
| Stream flow, instantaneous | daily maximum | report only (MGD) | all year | 028 |
| Stream flow, instantaneous | daily maximum | report only (MGD) | all year | 028 |
| Stream flow, instantaneous | daily maximum | report only (MGD) | all year | 028 |
| pH | minimum | ≥ 6 SU | all year | 028 |
| pH | maximum | ≤ 9 SU | all year | 028 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 028 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 028 |
| Chloride [as Cl] | monthly average | report only (mg/L) | all year | 028 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 028 |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year | 028 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 028 |
| Selenium, total recoverable | daily maximum | ≤ 8 ug/L | all year | 028 |
| Selenium, total recoverable | daily maximum | ≤ 10 ug/L | all year | 028 |
| Selenium, total recoverable | daily maximum | ≤ 12 ug/L | all year | 028 |
| Selenium, total recoverable | daily maximum | ≤ 16 ug/L | all year | 028 |
| Selenium, total recoverable | daily maximum | ≤ 25 ug/L | all year | 028 |
| Iron, total [as Fe] | monthly average | ≤ .5 mg/L | all year | 028 |
| Iron, total [as Fe] | daily maximum | ≤ 1 mg/L | all year | 028 |
| Aluminum, total [as Al] | monthly average | ≤ 1 mg/L | all year | 028 |
| Aluminum, total [as Al] | daily maximum | ≤ 2 mg/L | all year | 028 |
| Discharge flow as % of stream flow | daily maximum | ≤ 111 % | all year | 028 |
| Discharge flow as % of stream flow | daily maximum | ≤ 67 % | all year | 028 |
| Discharge flow as % of stream flow | daily maximum | ≤ 48 % | all year | 028 |
| Discharge flow as % of stream flow | daily maximum | ≤ 30 % | all year | 028 |
| Discharge flow as % of stream flow | daily maximum | ≤ 17 % | all year | 028 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 028 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 028 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 028 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 028 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 028 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 028 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 028 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 028 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 028 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 028 |
| Solids, total dissolved | monthly average | report only (mg/L) | all year | 028 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 028 |
| Whole effluent toxicity - retest #1 | 7-day average | report only (pass=0;fail=1) | all year | TX8 |
| Whole effluent toxicity - retest #2 | 7-day average | report only (pass=0;fail=1) | all year | TX8 |
| WET, sublethal retest #1 | 7-day average | report only (pass=0;fail=1) | all year | TX8 |
| WET, sublethal retest #2 | 7-day average | report only (pass=0;fail=1) | all year | TX8 |
| Whole Effluent Toxicity - Retest #3 | 7-day average | report only (pass=0;fail=1) | all year | TX8 |
| Whole Effluent Toxicity, Sub-Lethal Retest #3 | 7-day average | report only (pass=0;fail=1) | all year | TX8 |
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day average | report only (pass=0;fail=1) | all year | TX8 |
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 7-day average | report only (pass=0;fail=1) | all year | TX8 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day average | report only (pass=0;fail=1) | all year | TX8 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 7-day average | report only (pass=0;fail=1) | all year | TX8 |
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day average | report only (%) | all year | TX8 |
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 7-day average | report only (%) | all year | TX8 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day average | report only (%) | all year | TX8 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 7-day average | report only (%) | all year | TX8 |
| Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia | 7-day average | report only (%) | all year | TX8 |
| Coef Of Var Static Renewal 7Day Chronic Pimephales promelas | 7-day average | report only (%) | all year | TX8 |
| Whole Effluent Toxicity [WET] - C. dubia | daily average minimum | ≥ 100 % | all year | TX9 |
| Whole Effluent Toxicity [WET] - C. dubia | 7-day minimum | ≥ 100 % | all year | TX9 |
| Whole Effluent Toxicity [WET] - C. dubia | daily average minimum | ≥ 80 % | all year | TX9 |
| Whole Effluent Toxicity [WET] - C. dubia | 7-day minimum | ≥ 80 % | all year | TX9 |
| Whole Effluent Toxicity [WET] - P. promelas | daily average minimum | ≥ 100 % | all year | TX9 |
| Whole Effluent Toxicity [WET] - P. promelas | 7-day minimum | ≥ 100 % | all year | TX9 |
| Whole Effluent Toxicity [WET] - P. promelas | daily average minimum | ≥ 80 % | all year | TX9 |
| Whole Effluent Toxicity [WET] - P. promelas | 7-day minimum | ≥ 80 % | all year | TX9 |
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day average | report only (pass=0;fail=1) | all year | TX9 |
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 7-day average | report only (pass=0;fail=1) | all year | TX9 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day average | report only (pass=0;fail=1) | all year | TX9 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 7-day average | report only (pass=0;fail=1) | all year | TX9 |
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day average | report only (%) | all year | TX9 |
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 7-day average | report only (%) | all year | TX9 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day average | report only (%) | all year | TX9 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 7-day average | report only (%) | all year | TX9 |
| Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia | 7-day average | report only (%) | all year | TX9 |
| Coef Of Var Static Renewal 7Day Chronic Pimephales promelas | 7-day average | report only (%) | all year | TX9 |
| Whole effluent toxicity - retest #1 | 7-day average | report only (pass=0;fail=1) | all year | TXR |
| Whole effluent toxicity - retest #2 | 7-day average | report only (pass=0;fail=1) | all year | TXR |
| WET, sublethal retest #1 | 7-day average | report only (pass=0;fail=1) | all year | TXR |
| WET, sublethal retest #2 | 7-day average | report only (pass=0;fail=1) | all year | TXR |
| Whole Effluent Toxicity - Retest #3 | 7-day average | report only (pass=0;fail=1) | all year | TXR |
| Whole Effluent Toxicity, Sub-Lethal Retest #3 | 7-day average | report only (pass=0;fail=1) | all year | TXR |
| Whole Effluent Toxicity [WET] - C. dubia | daily average minimum | ≥ 62 % | all year | TXR |
| Whole Effluent Toxicity [WET] - C. dubia | 7-day minimum | ≥ 62 % | all year | TXR |
| Whole Effluent Toxicity [WET] - C. dubia | daily average minimum | ≥ 62 % | all year | TXR |
| Whole Effluent Toxicity [WET] - C. dubia | 7-day minimum | ≥ 62 % | all year | TXR |
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day average | report only (pass=0;fail=1) | all year | TXR |
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day average | report only (pass=0;fail=1) | all year | TXR |
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 7-day average | report only (pass=0;fail=1) | all year | TXR |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day average | report only (pass=0;fail=1) | all year | TXR |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day average | report only (pass=0;fail=1) | all year | TXR |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 7-day average | report only (pass=0;fail=1) | all year | TXR |
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day average | report only (%) | all year | TXR |
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 7-day average | report only (%) | all year | TXR |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day average | report only (%) | all year | TXR |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 7-day average | report only (%) | all year | TXR |
| Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia | 7-day average | report only (%) | all year | TXR |
| Coef Of Var Static Renewal 7Day Chronic Pimephales promelas | 7-day average | report only (%) | all year | TXR |
Cited limits by parameter: Arkansas's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/AR0000582 · MCP: https://passage-data.com/mcp