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Sewage treatment plant, Villa Ridge, Missouri. NPDES permit MO0108251, in force until Sep 30, 2031. Last 12 months: over a limit 2 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| June 2026 | Nitrogen, ammonia total [as N], monthly average | 5.21 | ≤ 2 mg/L | 161% |
| September 2026 | Nitrogen, ammonia total [as N], monthly average | 10.99 | ≤ 1.5 mg/L | 633% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Oct–Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Jan–Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Apr–Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Jul–Sep | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.9 mg/L | Oct–Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.1 mg/L | Jan–Mar | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2 mg/L | Apr–Jun | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Jul–Sep | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | INF |
| Solids, total suspended | monthly average | report only (mg/L) | all year | INF |
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/MO0108251 · MCP: https://passage-data.com/mcp