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Sewage treatment plant, Huntington, Arkansas. NPDES permit AR0037419 expired Feb 28, 2026; its limits still apply. Last 12 months: over a limit 21 times (last August 2026), 4 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Nitrogen, ammonia total [as N], 7-day average | 7.2 mg/L | ≤ 5.6 mg/L | 29% |
| October 2025 | Nitrogen, ammonia total [as N], monthly average | 6.2 mg/L | ≤ 4 mg/L | 55% |
| January 2026 | Nitrogen, ammonia total [as N], 7-day average | 6.92 mg/L | ≤ 6 mg/L | 15% |
| January 2026 | Nitrogen, ammonia total [as N], monthly average | 4.47 lb/d | ≤ 3.7 lb/d | 21% |
| January 2026 | Nitrogen, ammonia total [as N], monthly average | 6.5 mg/L | ≤ 4 mg/L | 63% |
| February 2026 | Solids, total suspended, monthly average | 40.65 lb/d | ≤ 27.5 lb/d | 48% |
| April 2026 | Solids, total suspended, monthly average | 27.96 lb/d | ≤ 27.5 lb/d | 2% |
| June 2026 | Nitrogen, ammonia total [as N], 7-day average | 17 mg/L | ≤ 5.6 mg/L | 204% |
| June 2026 | Nitrogen, ammonia total [as N], monthly average | 12.1 mg/L | ≤ 4 mg/L | 203% |
| June 2026 | Nitrogen, ammonia total [as N], monthly average | 4.48 lb/d | ≤ 3.7 lb/d | 21% |
| July 2026 | Coliform, fecal general, 30-day geometric mean | 423 #/100mL | ≤ 200 #/100mL | 112% |
| July 2026 | Coliform, fecal general, 7-day geometric mean | 940 #/100mL | ≤ 400 #/100mL | 135% |
| July 2026 | Nitrogen, ammonia total [as N], 7-day average | 17.09 mg/L | ≤ 5.6 mg/L | 205% |
| July 2026 | Nitrogen, ammonia total [as N], monthly average | 11.65 mg/L | ≤ 4 mg/L | 191% |
| July 2026 | Nitrogen, ammonia total [as N], monthly average | 4.03 lb/d | ≤ 3.7 lb/d | 9% |
| August 2026 | Coliform, fecal general, 30-day geometric mean | 523 #/100mL | ≤ 200 #/100mL | 162% |
| August 2026 | Coliform, fecal general, 7-day geometric mean | 640 #/100mL | ≤ 400 #/100mL | 60% |
| August 2026 | Nitrogen, ammonia total [as N], 7-day average | 20.34 mg/L | ≤ 5.6 mg/L | 263% |
| August 2026 | Nitrogen, ammonia total [as N], monthly average | 17.26 mg/L | ≤ 4 mg/L | 332% |
| August 2026 | Nitrogen, ammonia total [as N], monthly average | 4.24 lb/d | ≤ 3.7 lb/d | 15% |
| August 2026 | Oxygen, dissolved [DO], instantaneous minimum | 3.8 mg/L | ≥ 4 mg/L | 5% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 4 mg/L | May–Oct |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 3 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| pH | minimum | ≥ 6 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | monthly average | ≤ 20 mg/L | May–Oct |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | 7-day average | ≤ 30 mg/L | May–Oct |
| Solids, total suspended | monthly average | ≤ 27.5 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | monthly average | ≤ 18.3 lb/d | May–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4 mg/L | Jan, Feb, Mar, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4 mg/L | Apr–Oct |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 6 mg/L | Jan, Feb, Mar, Nov, Dec |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 5.6 mg/L | Apr–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.7 lb/d | Jan, Feb, Mar, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.7 lb/d | Apr–Oct |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Chlorine, total residual | instantaneous maximum | ≤ .011 mg/L | all year |
| Coliform, fecal general | 30-day geometric mean | ≤ 200 #/100mL | May–Sep |
| Coliform, fecal general | 30-day geometric mean | ≤ 1000 #/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Coliform, fecal general | 7-day geometric mean | ≤ 400 #/100mL | May–Sep |
| Coliform, fecal general | 7-day geometric mean | ≤ 2000 #/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Overflows | monthly total | report only (occur/mo) | all year |
| Overflow volume [SS0 volume, CSO volume] | monthly total | report only (gal) | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 20 mg/L | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 30 mg/L | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 18.3 lb/d | May–Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 22.9 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
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/AR0037419 · MCP: https://passage-data.com/mcp