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Sewage treatment plant, major discharger, Siloam Springs, Arkansas. NPDES permit AR0020273, in force until Sep 30, 2031. Last 12 months: over a limit 10 times (last August 2026), 23 required values missing, 1 of 20 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| January 2026 | Phosphorus, total [as P], 7-day average | 2.07 mg/L | ≤ 1.5 mg/L | 38% |
| April 2026 | Nitrogen, ammonia total [as N], 7-day average | 4.34 | ≤ 3.9 mg/L | 11% |
| June 2026 | Nitrogen, ammonia total [as N], 7-day average | 3.28 mg/L | ≤ 2.3 mg/L | 43% |
| June 2026 | Nitrogen, ammonia total [as N], monthly average | 2.27 mg/L | ≤ 1.5 mg/L | 51% |
| June 2026 | Oxygen, dissolved [DO], monthly average minimum | 6.9 mg/L | ≥ 7 mg/L | 1% |
| June 2026 | Phosphorus, total [as P], 7-day average | 1.68 mg/L | ≤ 1.5 mg/L | 12% |
| July 2026 | Nitrogen, ammonia total [as N], 7-day average | 3.885 mg/L | ≤ 2.3 mg/L | 69% |
| July 2026 | Nitrogen, ammonia total [as N], monthly average | 2.816 mg/L | ≤ 1.5 mg/L | 88% |
| August 2026 | Nitrogen, ammonia total [as N], 7-day average | 3.67 mg/L | ≤ 2.3 mg/L | 60% |
| August 2026 | Nitrogen, ammonia total [as N], monthly average | 2.1 mg/L | ≤ 1.5 mg/L | 40% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Overflows | monthly total | report only (occur/mo) | all year | SSO |
| Overflow volume [SS0 volume, CSO volume] | monthly total | report only (gal) | all year | SSO |
| 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 |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Nitrite + Nitrate total [as N], instantaneous maximum | 10 mg/L | new | — | — |
| Nitrite + Nitrate total [as N], monthly average | 442 lb/d | new | — | — |
Cited limits by parameter: Arkansas's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
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