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Sewage treatment plant, Philadelphia, Missouri. NPDES permit MO0109622 expired Sep 30, 2022; its limits still apply. Last 12 months: over a limit 2 times (last March 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| March 2026 | Nitrogen, ammonia total [as N], daily maximum | 21 | ≤ 7.5 mg/L | 180% |
| March 2026 | Nitrogen, ammonia total [as N], monthly average | 21 | ≤ 2.9 mg/L | 624% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| BOD, 5-day, 20 deg. C | weekly average | ≤ 65 mg/L | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 45 mg/L | all year |
| pH | minimum | ≥ 6.5 SU | all year |
| Solids, total suspended | weekly average | ≤ 110 mg/L | all year |
| Solids, total suspended | monthly average | ≤ 70 mg/L | all year |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.5 mg/L | Jan, Feb, Mar, Oct, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.6 mg/L | Apr–Sep |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.9 mg/L | Jan, Feb, Mar, Oct, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.4 mg/L | Apr–Sep |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year |
| E. coli | 7-day geometric mean | ≤ 1030 #/100mL | all year |
| E. coli | 30-day geometric mean | ≤ 206 #/100mL | all year |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 65 % | all year |
| Solids, suspended percent removal | monthly average minimum | ≥ 65 % | all year |
Cited limits by parameter: Missouri'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/MO0109622 · MCP: https://passage-data.com/mcp