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Sewerage Systems, Knob Noster, Missouri. NPDES permit MO0109142 expired Jun 30, 2026; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| 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 | ≤ 45 mg/L | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year |
| pH | minimum | ≥ 6 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 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | ≤ 15 mg/L | all year |
| Oil and grease [soxhlet extr.] tot. | monthly average | ≤ 10 mg/L | all year |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.1 mg/L | Mar, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.1 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.1 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Jan, Nov |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | May |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.7 mg/L | Mar, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.1 mg/L | Jul |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.3 mg/L | Apr |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.7 mg/L | Sep |
| Nitrogen, ammonia total [as N] | monthly maximum | ≤ 3.1 mg/L | Jan, Nov |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Feb |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Jun |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.3 mg/L | Aug |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.6 mg/L | Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.9 mg/L | May |
| 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 | ≤ 18 ug/L | Apr–Oct |
| Chlorine, total residual | monthly average | ≤ 9 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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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/MO0109142 · MCP: https://passage-data.com/mcp