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Sewage treatment plant, Mayflower, Arkansas. NPDES permit AR0037206, in force until Dec 31, 2030. Last 12 months: over a limit 14 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | Nitrogen, ammonia total [as N], 7-day average | 23.8 mg/L | ≤ 22.5 mg/L | 6% |
| December 2025 | Nitrogen, ammonia total [as N], monthly average | 21.7 mg/L | ≤ 15 mg/L | 45% |
| December 2025 | Nitrogen, ammonia total [as N], monthly average | 63.2 lb/d | ≤ 62.6 lb/d | 1% |
| January 2026 | Nitrogen, ammonia total [as N], 7-day average | 36.6 mg/L | ≤ 22.5 mg/L | 63% |
| January 2026 | Nitrogen, ammonia total [as N], monthly average | 27 mg/L | ≤ 15 mg/L | 80% |
| February 2026 | Nitrogen, ammonia total [as N], monthly average | 19.2 mg/L | ≤ 15 mg/L | 28% |
| March 2026 | Nitrogen, ammonia total [as N], monthly average | 18.7 mg/L | ≤ 15 mg/L | 25% |
| April 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 31.5 mg/L | ≤ 25 mg/L | 26% |
| April 2026 | Nitrogen, ammonia total [as N], monthly average | 20 mg/L | ≤ 15 mg/L | 33% |
| May 2026 | BOD, carbonaceous [5 day, 20 C], 7-day average | 50 mg/L | ≤ 38 mg/L | 32% |
| May 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 123.68 lb/d | ≤ 104.3 lb/d | 19% |
| May 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 50 mg/L | ≤ 25 mg/L | 100% |
| June 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 28 mg/L | ≤ 25 mg/L | 12% |
| September 2026 | Nitrogen, ammonia total [as N], monthly average | 17.5 mg/L | ≤ 15 mg/L | 17% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 2 mg/L | all year |
| pH | minimum | ≥ 6 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| Solids, total suspended | monthly average | ≤ 90 mg/L | all year |
| Solids, total suspended | 7-day average | ≤ 135 mg/L | all year |
| Solids, total suspended | monthly average | ≤ 375 lb/d | all year |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 15 mg/L | all year |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 22.5 mg/L | all year |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 62.6 lb/d | all year |
| 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 |
| 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 | ≤ 25 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 38 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 104.3 lb/d | all year |
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/AR0037206 · MCP: https://passage-data.com/mcp