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Sewerage Systems, Shell Knob, Missouri. NPDES permit MO0121835 expired Sep 30, 2023; its limits still apply. Last 12 months: over a limit once (last September 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit |
|---|---|---|---|
| September 2026 | E. coli, daily maximum | > 1 | ≤ 630 MPN/100mL |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | Apr–Dec |
| Oxygen, dissolved [DO] | monthly average minimum | report only (mg/L) | Apr–Dec |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 30 mg/L | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 20 mg/L | all year |
| pH | minimum | ≥ 6 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| Solids, total suspended | weekly average | ≤ 30 mg/L | all year |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | all year |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 12.1 mg/L | all year |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year |
| 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 | ≤ 19 ug/L | Apr–Dec |
| Chlorine, total residual | monthly average | ≤ 9 ug/L | Apr–Dec |
| E. coli | daily maximum | ≤ 630 MPN/100mL | Apr–Dec |
| E. coli | 30-day geometric mean | ≤ 126 MPN/100mL | Apr–Dec |
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/MO0121835 · MCP: https://passage-data.com/mcp