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Sewerage Systems, Eugene, Missouri. NPDES permit MO0088986 expired Dec 31, 2024; its limits still apply. Last 12 months: over a limit 2 times (last December 2025). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | Nitrogen, ammonia total [as N], daily maximum | 5.79 | ≤ 4.8 mg/L | 21% |
| December 2025 | Nitrogen, ammonia total [as N], monthly average | 2.32 | ≤ 1.6 mg/L | 45% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | Apr–Oct |
| Oxygen, dissolved [DO] | monthly average minimum | report only (mg/L) | Apr–Oct |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 37 mg/L | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 25 mg/L | all year |
| pH | minimum | ≥ 6.5 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.8 mg/L | Apr–Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.8 mg/L | Jan, Feb, Mar, Oct, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .8 mg/L | Apr–Sep |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.6 mg/L | Jan, Feb, Mar, Oct, Nov, Dec |
| 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 |
| Chlorine, total residual | daily maximum | ≤ 17 ug/L | Apr–Oct |
| Chlorine, total residual | monthly average | ≤ 8 ug/L | Apr–Oct |
| E. coli | daily maximum | ≤ 1030 #/100mL | Apr–Oct |
| E. coli | 30-day geometric mean | ≤ 206 #/100mL | Apr–Oct |
Cited limits by parameter: Missouri's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/MO0088986 · MCP: https://passage-data.com/mcp