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Kaolin And Ball Clay, Little Rock, Arkansas. NPDES permit AR0001503 expired Dec 31, 2025; its limits still apply. Last 12 months: no values over a limit, 16 of 28 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Turbidity | instantaneous maximum | ≤ 21 NTU | all year | 001 |
| Oxygen demand, chem. [low level] [COD] | monthly average | ≤ 50 mg/L | all year | 001 |
| Oxygen demand, chem. [low level] [COD] | daily maximum | ≤ 75 mg/L | all year | 001 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Oil & Grease | monthly average | ≤ 10 mg/L | all year | 001 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 001 |
| Sulfate, total [as SO4] | monthly average | ≤ 250 mg/L | all year | 001 |
| Sulfate, total [as SO4] | daily maximum | ≤ 375 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 |
| Solids, total dissolved | monthly average | ≤ 432 mg/L | all year | 001 |
| Solids, total dissolved | daily maximum | ≤ 648 mg/L | all year | 001 |
| Turbidity | instantaneous maximum | ≤ 21 NTU | all year | 002 |
| Oxygen demand, chem. [low level] [COD] | monthly average | ≤ 50 mg/L | all year | 002 |
| Oxygen demand, chem. [low level] [COD] | daily maximum | ≤ 75 mg/L | all year | 002 |
| pH | minimum | ≥ 6 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 |
| Sulfate, total [as SO4] | monthly average | ≤ 250 mg/L | all year | 002 |
| Sulfate, total [as SO4] | daily maximum | ≤ 375 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 |
| Solids, total dissolved | monthly average | ≤ 432 mg/L | all year | 002 |
| Solids, total dissolved | daily maximum | ≤ 648 mg/L | all year | 002 |
| 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 |
| WET, sublethal retest #1 | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| WET, sublethal retest #2 | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| Whole Effluent Toxicity - Retest #3 | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| Whole Effluent Toxicity, Sub-Lethal Retest #3 | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (pass=0;fail=1) | 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 |
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (%) | 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 Ceriodaphnia dubia | 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 Ceriodaphnia dubia | 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 |
| Whole effluent toxicity - retest #1 | 7-day minimum | report only (pass=0;fail=1) | all year | TX2 |
| Whole effluent toxicity - retest #2 | 7-day minimum | report only (pass=0;fail=1) | all year | TX2 |
| WET, sublethal retest #1 | 7-day minimum | report only (pass=0;fail=1) | all year | TX2 |
| WET, sublethal retest #2 | 7-day minimum | report only (pass=0;fail=1) | all year | TX2 |
| Whole Effluent Toxicity - Retest #3 | 7-day minimum | report only (pass=0;fail=1) | all year | TX2 |
| Whole Effluent Toxicity, Sub-Lethal Retest #3 | 7-day minimum | report only (pass=0;fail=1) | all year | TX2 |
| Whole Effluent Toxicity [WET] - C. dubia | 7-day minimum | ≥ 100 % | all year | TX2 |
| Whole Effluent Toxicity [WET] - C. dubia | 7-day minimum | ≥ 80 % | all year | TX2 |
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (pass=0;fail=1) | all year | TX2 |
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 7-day minimum | report only (pass=0;fail=1) | all year | TX2 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (pass=0;fail=1) | all year | TX2 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 7-day minimum | report only (pass=0;fail=1) | all year | TX2 |
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (%) | all year | TX2 |
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 7-day minimum | report only (%) | all year | TX2 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (%) | all year | TX2 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 7-day minimum | report only (%) | all year | TX2 |
| Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (%) | all year | TX2 |
| Coef Of Var Static Renewal 7Day Chronic Pimephales promelas | 7-day minimum | report only (%) | all year | TX2 |
Cited limits by parameter: Arkansas's rules and the federal ones.
Same industry: the 30 Mining and Quarrying of Nonmetallic Minerals permits in Arkansas.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/AR0001503 · MCP: https://passage-data.com/mcp