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Uranium-Radium-Vanadium Ores, major discharger, Hot Springs, Arkansas. NPDES permit AR0000523, in force until Aug 31, 2027. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Streamflow | monthly average | report only (cfs) | all year | 001 |
| Streamflow | daily maximum | report only (cfs) | all year | 001 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 001 |
| Solids, total suspended | daily maximum | report only (lb/d) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 100 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 200 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (lb/d) | all year | 001 |
| Vanadium, total [as V] | monthly average | report only (mg/L) | all year | 001 |
| Vanadium, total [as V] | daily maximum | report only (mg/L) | all year | 001 |
| Vanadium, total [as V] | monthly average | report only (lb/d) | all year | 001 |
| Vanadium, total [as V] | daily maximum | report only (lb/d) | all year | 001 |
| Discharge flow as % of stream flow | daily maximum | ≤ .5 % | all year | 001 |
| Rainfall | monthly average | report only (in) | all year | 001 |
| Rainfall | daily maximum | report only (in) | 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 | ≤ 2.6 MGD | all year | 001 |
| pH | minimum | ≥ 6 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 002 |
| Sulfate, total [as SO4] | monthly average | ≤ 112 mg/L | all year | 002 |
| Sulfate, total [as SO4] | daily maximum | ≤ 168 mg/L | all year | 002 |
| Selenium, total recoverable | monthly average | ≤ 5.6 ug/L | all year | 002 |
| Selenium, total recoverable | daily maximum | ≤ 11.2 ug/L | all year | 002 |
| Nickel, total recoverable | monthly average | ≤ 108.1 ug/L | all year | 002 |
| Nickel, total recoverable | daily maximum | ≤ 216.9 ug/L | all year | 002 |
| Cadmium, total recoverable | monthly average | ≤ 2.3 ug/L | all year | 002 |
| Cadmium, total recoverable | daily maximum | ≤ 4.5 ug/L | all year | 002 |
| Lead, total recoverable | monthly average | ≤ 3.2 ug/L | all year | 002 |
| Lead, total recoverable | daily maximum | ≤ 6.5 ug/L | all year | 002 |
| Copper, total recoverable | monthly average | ≤ 10.5 ug/L | all year | 002 |
| Copper, total recoverable | daily maximum | ≤ 21 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 |
| Mercury, total recoverable | monthly average | ≤ .013 ug/L | all year | 002 |
| Mercury, total recoverable | daily maximum | ≤ .027 ug/L | all year | 002 |
| pH | minimum | ≥ 6 SU | all year | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 003 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 003 |
| Sulfate, total [as SO4] | monthly average | ≤ 68 mg/L | all year | 003 |
| Sulfate, total [as SO4] | daily maximum | ≤ 102 mg/L | all year | 003 |
| Nickel, total recoverable | monthly average | ≤ 108.1 ug/L | all year | 003 |
| Nickel, total recoverable | daily maximum | ≤ 217 ug/L | all year | 003 |
| Lead, total recoverable | monthly average | ≤ 3.2 ug/L | all year | 003 |
| Lead, total recoverable | daily maximum | ≤ 6.5 ug/L | all year | 003 |
| Copper, total recoverable | monthly average | ≤ 10.5 ug/L | all year | 003 |
| Copper, total recoverable | daily maximum | ≤ 21 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 | 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 |
| Sulfate, total [as SO4] | monthly average | ≤ 182 mg/L | all year | 008 |
| Sulfate, total [as SO4] | daily maximum | ≤ 250 mg/L | all year | 008 |
| Beryllium, total recoverable [as Be] | monthly average | ≤ 4.5 ug/L | Jun–Nov | 008 |
| Beryllium, total recoverable [as Be] | monthly average | ≤ 5.3 ug/L | Jan, Feb, Mar, Apr, May, Dec | 008 |
| Beryllium, total recoverable [as Be] | daily maximum | ≤ 9 ug/L | Jun–Nov | 008 |
| Beryllium, total recoverable [as Be] | daily maximum | ≤ 10.6 ug/L | Jan, Feb, Mar, Apr, May, Dec | 008 |
| Nickel, total recoverable | monthly average | ≤ 108.1 ug/L | Jun–Nov | 008 |
| Nickel, total recoverable | monthly average | ≤ 127.6 ug/L | Jan, Feb, Mar, Apr, May, Dec | 008 |
| Nickel, total recoverable | daily maximum | ≤ 217 ug/L | Jun–Nov | 008 |
| Nickel, total recoverable | daily maximum | ≤ 256.1 ug/L | Jan, Feb, Mar, Apr, May, Dec | 008 |
| Zinc, total recoverable | monthly average | ≤ 95.2 ug/L | Jun–Nov | 008 |
| Zinc, total recoverable | monthly average | ≤ 103.6 ug/L | Jan, Feb, Mar, Apr, May, Dec | 008 |
| Zinc, total recoverable | daily maximum | ≤ 191 ug/L | Jun–Nov | 008 |
| Zinc, total recoverable | daily maximum | ≤ 207.9 ug/L | Jan, Feb, Mar, Apr, May, Dec | 008 |
| Cadmium, total recoverable | monthly average | ≤ 2.3 ug/L | Jun–Nov | 008 |
| Cadmium, total recoverable | monthly average | ≤ 2.7 ug/L | Jan, Feb, Mar, Apr, May, Dec | 008 |
| Cadmium, total recoverable | daily maximum | ≤ 4.5 ug/L | Jun–Nov | 008 |
| Cadmium, total recoverable | daily maximum | ≤ 5.3 ug/L | Jan, Feb, Mar, Apr, May, Dec | 008 |
| Copper, total recoverable | monthly average | ≤ 10.5 ug/L | Jun–Nov | 008 |
| Copper, total recoverable | monthly average | ≤ 12.2 ug/L | Jan, Feb, Mar, Apr, May, Dec | 008 |
| Copper, total recoverable | daily maximum | ≤ 21 ug/L | Jun–Nov | 008 |
| Copper, total recoverable | daily maximum | ≤ 24.5 ug/L | Jan, Feb, Mar, Apr, May, Dec | 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 |
| 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 |
| WET, sublethal retest #1 | 48-hour minimum | report only (pass=0;fail=1) | all year | TX1 |
| WET, sublethal retest #2 | 48-hour minimum | report only (pass=0;fail=1) | all year | TX1 |
| Whole Effluent Toxicity - Retest #3 | 48-hour minimum | report only (pass=0;fail=1) | all year | TX1 |
| Whole Effluent Toxicity, Sub-Lethal Retest #3 | 48-hour minimum | report only (pass=0;fail=1) | all year | TX1 |
| Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex | 48-hour minimum | report only (pass=0;fail=1) | all year | TX1 |
| LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas | 48-hour minimum | report only (pass=0;fail=1) | all year | TX1 |
| NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex | 48-hour minimum | report only (%) | all year | TX1 |
| NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas | 48-hour minimum | report only (%) | all year | TX1 |
| Coef Of Var Static Renewal 48Hr Acute D. pulex | 48-hour minimum | report only (%) | all year | TX1 |
| Coef Of Var Static Renewal 48Hr Acute Pimephales promelas | 48-hour minimum | report only (%) | all year | TX1 |
| 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 |
| Whole Effluent Toxicity [WET] - P. promelas | 7-day minimum | ≥ 100 % | all year | TX2 |
| Whole Effluent Toxicity [WET] - P. promelas | 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 |
| Whole Effluent Toxicity [WET] - C. dubia | 7-day minimum | ≥ 100 % | all year | TX3 |
| Whole Effluent Toxicity [WET] - C. dubia | 7-day minimum | ≥ 80 % | all year | TX3 |
| Whole Effluent Toxicity [WET] - P. promelas | 7-day minimum | ≥ 100 % | all year | TX3 |
| Whole Effluent Toxicity [WET] - P. promelas | 7-day minimum | ≥ 80 % | all year | TX3 |
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (pass=0;fail=1) | all year | TX3 |
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 7-day minimum | report only (pass=0;fail=1) | all year | TX3 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (pass=0;fail=1) | all year | TX3 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 7-day minimum | report only (pass=0;fail=1) | all year | TX3 |
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (%) | all year | TX3 |
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 7-day minimum | report only (%) | all year | TX3 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (%) | all year | TX3 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 7-day minimum | report only (%) | all year | TX3 |
| Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (%) | all year | TX3 |
| Coef Of Var Static Renewal 7Day Chronic Pimephales promelas | 7-day minimum | report only (%) | all year | TX3 |
| Whole Effluent Toxicity [WET] - C. dubia | 7-day minimum | ≥ 100 % | all year | TX8 |
| Whole Effluent Toxicity [WET] - C. dubia | 7-day minimum | ≥ 80 % | all year | TX8 |
| Whole Effluent Toxicity [WET] - P. promelas | 7-day minimum | ≥ 100 % | all year | TX8 |
| Whole Effluent Toxicity [WET] - P. promelas | 7-day minimum | ≥ 80 % | all year | TX8 |
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (pass=0;fail=1) | all year | TX8 |
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 7-day minimum | report only (pass=0;fail=1) | all year | TX8 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (pass=0;fail=1) | all year | TX8 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 7-day minimum | report only (pass=0;fail=1) | all year | TX8 |
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (%) | all year | TX8 |
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 7-day minimum | report only (%) | all year | TX8 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (%) | all year | TX8 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 7-day minimum | report only (%) | all year | TX8 |
| Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (%) | all year | TX8 |
| Coef Of Var Static Renewal 7Day Chronic Pimephales promelas | 7-day minimum | report only (%) | all year | TX8 |
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/AR0000523 · MCP: https://passage-data.com/mcp