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Fertilizers, Mixing Only, Walnut Ridge, Arkansas. NPDES permit AR0036668 expired Oct 31, 2026. Last 12 months: over a limit 2 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| June 2026 | Whole Effluent Toxicity [WET] - C. dubia, 7-day minimum | 17 % | ≥ 100 % | 83% |
| June 2026 | Whole Effluent Toxicity [WET] - C. dubia, 7-day minimum | 17 % | ≥ 80 % | 79% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Streamflow | monthly average | report only (MGD) | Jul–Sep | 001 |
| Streamflow | daily maximum | report only (MGD) | Jul–Sep | 001 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 31 mg/L | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 31 mg/L | Jun, Oct, Nov | 001 |
| Solids, total suspended | daily maximum | ≤ 60 mg/L | Jan, Feb, Mar, Apr, May, Jul, Aug, Sep, Dec | 001 |
| Solids, total suspended | daily maximum | ≤ 60 mg/L | Jun, Oct, Nov | 001 |
| Solids, total suspended | monthly average | ≤ 46.5 lb/d | Jun, Oct, Nov | 001 |
| Solids, total suspended | daily maximum | ≤ 69.8 lb/d | Jun, Oct, Nov | 001 |
| Chloride [as Cl] | monthly average | report only (mg/L) | all year | 001 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 001 |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year | 001 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 001 |
| Cadmium, total [as Cd] | monthly average | ≤ 4 ug/L | Jun, Oct, Nov | 001 |
| Cadmium, total [as Cd] | daily maximum | ≤ 8 ug/L | Jun, Oct, Nov | 001 |
| Cadmium, total [as Cd] | monthly average | ≤ .006 lb/d | Jun, Oct, Nov | 001 |
| Cadmium, total [as Cd] | daily maximum | ≤ .009 lb/d | Jun, Oct, Nov | 001 |
| Copper, total [as Cu] | monthly average | ≤ 29.5 ug/L | Jun, Oct, Nov | 001 |
| Copper, total [as Cu] | daily maximum | ≤ 59.1 ug/L | Jun, Oct, Nov | 001 |
| Copper, total [as Cu] | monthly average | ≤ .044 lb/d | Jun, Oct, Nov | 001 |
| Copper, total [as Cu] | daily maximum | ≤ .066 lb/d | Jun, Oct, Nov | 001 |
| Zinc, total [as Zn] | monthly average | ≤ 281.9 ug/L | Jun, Oct, Nov | 001 |
| Zinc, total [as Zn] | daily maximum | ≤ 565.6 ug/L | Jun, Oct, Nov | 001 |
| Zinc, total [as Zn] | monthly average | ≤ .423 lb/d | Jun, Oct, Nov | 001 |
| Zinc, total [as Zn] | daily maximum | ≤ .635 lb/d | Jun, Oct, Nov | 001 |
| Discharge flow as % of stream flow | daily maximum | ≤ 14.7 % | Jul–Sep | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, May, Dec | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jun–Nov | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ .06 MGD | Jan, Feb, Mar, Apr, May, Dec | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | Jun–Nov | 001 |
| 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 |
| Whole Effluent Toxicity [WET] - C. dubia | 7-day minimum | ≥ 100 % | Jun, Oct, Nov | TX1 |
| Whole Effluent Toxicity [WET] - C. dubia | 7-day minimum | ≥ 80 % | Jun, Oct, Nov | 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 |
Cited limits by parameter: Arkansas's rules and the federal ones.
Same industry: the 15 Chemicals and Allied Products 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/AR0036668 · MCP: https://passage-data.com/mcp