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Sewage treatment plant, Columbia, Missouri. NPDES permit MO0126624 expired Mar 31, 2025; 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 | Over by |
|---|---|---|---|---|
| September 2026 | E. coli, daily maximum | 160.7 | ≤ 126 MPN/100mL | 28% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| BOD, 5-day, 20 deg. C | weekly average | ≤ 15 mg/L | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 10 mg/L | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 3.2 lb/d | all year |
| pH | minimum | ≥ 6.5 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| Solids, total suspended | weekly average | ≤ 15 mg/L | all year |
| Solids, total suspended | monthly average | ≤ 10 mg/L | all year |
| Solids, total suspended | monthly average | ≤ 3.2 lb/d | all year |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.7 mg/L | Apr–Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.6 mg/L | Jan, Feb, Mar, Oct, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .6 mg/L | Apr–Sep |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.1 mg/L | Jan, Feb, Mar, Oct, Nov, Dec |
| Chloride | daily maximum | report only (mg/L) | all year |
| Chloride | 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 |
| E. coli | daily maximum | ≤ 126 MPN/100mL | all year |
| E. coli | monthly average | report only (MPN/100mL) | all year |
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/MO0126624 · MCP: https://passage-data.com/mcp