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Sewage treatment plant, major discharger, Monticello, Arkansas. NPDES permit AR0021831 expired Jan 31, 2025; its limits still apply. Last 12 months: no values over a limit, 3 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Stream flow, instantaneous | monthly average | report only (MGD) | all year | 001 |
| Stream flow, instantaneous | daily maximum | report only (MGD) | all year | 001 |
| 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 | ≤ 90 mg/L | all year | 001 |
| Solids, total suspended | 7-day average | ≤ 135 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5.4 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 12.6 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4.4 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 13.9 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 22.5 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 11.3 mg/L | Apr | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | 7-day average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | 7-day average | report only (mg/L) | all year | 001 |
| Copper, total recoverable | monthly average | ≤ 19 ug/L | all year | 001 |
| Copper, total recoverable | 7-day average | ≤ 37 ug/L | all year | 001 |
| Discharge flow as % of stream flow | daily maximum | ≤ 78 % | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Discharge flow as % of stream flow | daily maximum | ≤ 52 % | May–Oct | 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 |
| Mercury, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Mercury, total recoverable | 7-day average | report only (ug/L) | all year | 001 |
| Mercury, total recoverable | monthly average | 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 |
| Overflows | monthly total | report only (occur/mo) | all year | 001 |
| Overflow volume [SS0 volume, CSO volume] | monthly total | report only (gal) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | all year | 001 |
| Whole effluent toxicity - retest #1 | 7-day average | report only (pass=0;fail=1) | all year | TX1 |
| Whole effluent toxicity - retest #2 | 7-day average | report only (pass=0;fail=1) | all year | TX1 |
| WET, sublethal retest #1 | 7-day average | report only (pass=0;fail=1) | all year | TX1 |
| WET, sublethal retest #2 | 7-day average | report only (pass=0;fail=1) | all year | TX1 |
| Whole Effluent Toxicity - Retest #3 | 7-day average | report only (pass=0;fail=1) | all year | TX1 |
| Whole Effluent Toxicity, Sub-Lethal Retest #3 | 7-day average | 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 |
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/AR0021831 · MCP: https://passage-data.com/mcp