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Sewage treatment plant, Silex, Missouri. NPDES permit MO0108243, in force until Dec 31, 2027. Last 12 months: over a limit 2 times (last May 2026), 21 required values missing, 16 of 44 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| May 2026 | E. coli, 30-day geometric mean | 6890 | ≤ 126 #/100mL | 5368% |
| May 2026 | E. coli, 7-day geometric mean | 6890 | ≤ 630 #/100mL | 994% |
| 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 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | report only (mg/L) | all year | 001 |
| Oil and grease [soxhlet extr.] tot. | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.1 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Jan, Feb | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Jul, Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.1 mg/L | Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.3 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.1 mg/L | Jan, Feb | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.1 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.1 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.2 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .9 mg/L | Jul, Aug | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.4 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.8 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.7 mg/L | Mar, Dec | 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 |
| E. coli | 7-day geometric mean | ≤ 630 #/100mL | Apr–Oct | 001 |
| E. coli | 30-day geometric mean | ≤ 126 #/100mL | Apr–Oct | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 65 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 65 % | all year | 001 |
| Rainfall | total | report only (in) | all year | 002 |
| Rainfall | monthly total | report only (in) | all year | 002 |
| Freeboard | total | report only (ft) | all year | 002 |
| Application rate, gallons spray irrigation | total | report only (gal) | all year | 003 |
| Application rate, gallons spray irrigation | monthly total | report only (gal) | all year | 003 |
| 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/MO0108243 · MCP: https://passage-data.com/mcp