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Gypsum Products, Nashville, Arkansas. NPDES permit AR0020729 expired Dec 31, 2025; its limits still apply. Last 12 months: no values over a limit, 4 required values missing, 5 of 58 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 3 mg/L | May–Oct | 001 |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 15 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 22.5 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 64.8 lb/d | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 97.2 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 | ≤ 43.2 lb/d | all year | 001 |
| Oil & Grease | daily maximum | ≤ 64.8 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.1 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.5 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.1 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 21.6 lb/d | Apr | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 21.6 lb/d | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 21.6 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26.4 lb/d | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 32.4 lb/d | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26.4 lb/d | May–Oct | 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 |
| Sulfate, total [as SO4] | monthly average | report only (lb/d) | all year | 001 |
| Sulfate, total [as SO4] | daily maximum | report only (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 |
| Solids, total dissolved | monthly average | report only (mg/L) | all year | 001 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total dissolved | monthly average | report only (lb/d) | all year | 001 |
| Solids, total dissolved | daily maximum | report only (lb/d) | all year | 001 |
| Coliform, fecal general | 30-day geometric mean | ≤ 1000 #/100mL | all year | 001 |
| Coliform, fecal general | 7-day geometric mean | ≤ 2000 #/100mL | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 15 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 43.2 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 64.8 lb/d | 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 |
| Oil & Grease | monthly average | ≤ 10 mg/L | all year | 002 |
| Oil & Grease | daily maximum | ≤ 15 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 |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 3 mg/L | May–Oct | 002B |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002B |
| pH | minimum | ≥ 6 SU | all year | 002B |
| pH | maximum | ≤ 9 SU | all year | 002B |
| Solids, total suspended | monthly average | ≤ 15 mg/L | all year | 002B |
| Solids, total suspended | daily maximum | ≤ 22.5 mg/L | all year | 002B |
| Oil & Grease | monthly average | ≤ 10 mg/L | all year | 002B |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 002B |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5 mg/L | Apr | 002B |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5 mg/L | May–Oct | 002B |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5 mg/L | Jan, Feb, Mar, Nov, Dec | 002B |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.1 mg/L | Apr | 002B |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.1 mg/L | May–Oct | 002B |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.5 mg/L | Jan, Feb, Mar, Nov, Dec | 002B |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year | 002B |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 002B |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002B |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002B |
| Solids, total dissolved | monthly average | report only (mg/L) | all year | 002B |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 002B |
| Coliform, fecal general | 30-day geometric mean | ≤ 1000 #/100mL | all year | 002B |
| Coliform, fecal general | 7-day geometric mean | ≤ 2000 #/100mL | all year | 002B |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | all year | 002B |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 15 mg/L | all year | 002B |
| 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 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 |
| Whole effluent toxicity - retest #1 | 7-day minimum | report only (pass=0;fail=1) | all year | TX2B |
| Whole effluent toxicity - retest #2 | 7-day minimum | report only (pass=0;fail=1) | all year | TX2B |
| WET, sublethal retest #1 | 7-day minimum | report only (pass=0;fail=1) | all year | TX2B |
| WET, sublethal retest #2 | 7-day minimum | report only (pass=0;fail=1) | all year | TX2B |
| Whole Effluent Toxicity - Retest #3 | 7-day minimum | report only (pass=0;fail=1) | all year | TX2B |
| Whole Effluent Toxicity, Sub-Lethal Retest #3 | 7-day minimum | report only (pass=0;fail=1) | all year | TX2B |
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (pass=0;fail=1) | all year | TX2B |
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 7-day minimum | report only (pass=0;fail=1) | all year | TX2B |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (pass=0;fail=1) | all year | TX2B |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 7-day minimum | report only (pass=0;fail=1) | all year | TX2B |
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (%) | all year | TX2B |
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 7-day minimum | report only (%) | all year | TX2B |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (%) | all year | TX2B |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 7-day minimum | report only (%) | all year | TX2B |
| Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (%) | all year | TX2B |
| Coef Of Var Static Renewal 7Day Chronic Pimephales promelas | 7-day minimum | report only (%) | all year | TX2B |
Cited limits by parameter: Arkansas's rules and the federal ones.
Same industry: the 7 Stone, Clay, Glass and Concrete 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/AR0020729 · MCP: https://passage-data.com/mcp