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Sewage treatment plant, Chamois, Missouri. NPDES permit MO0039624 expired Jun 30, 2025; its limits still apply. Last 12 months: over a limit 6 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| November 2025 | Solids, suspended percent removal, monthly average minimum | 49.9 | ≥ 65 % | 43% |
| November 2025 | pH, maximum | 9.1 | ≤ 9 SU | — |
| February 2026 | Solids, suspended percent removal, monthly average minimum | 54.4 | ≥ 65 % | 30% |
| March 2026 | BOD, 5-day, percent removal, monthly average minimum | 58.1 | ≥ 65 % | 20% |
| March 2026 | Solids, suspended percent removal, monthly average minimum | 54.5 | ≥ 65 % | 30% |
| August 2026 | BOD, 5-day, percent removal, monthly average minimum | 57.4 | ≥ 65 % | 22% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | weekly average | ≤ 65 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 45 mg/L | all year | 002 |
| pH | minimum | ≥ 6 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | weekly average | ≤ 120 mg/L | all year | 002 |
| Solids, total suspended | monthly average | ≤ 80 mg/L | all year | 002 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | ≤ 15 mg/L | all year | 002 |
| Oil and grease [soxhlet extr.] tot. | monthly average | ≤ 10 mg/L | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| E. coli | 7-day geometric mean | ≤ 1030 #/100mL | Apr–Oct | 002 |
| E. coli | 30-day geometric mean | ≤ 206 #/100mL | Apr–Oct | 002 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 65 % | all year | 002 |
| Solids, suspended percent removal | monthly average minimum | ≥ 65 % | all year | 002 |
| 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/MO0039624 · MCP: https://passage-data.com/mcp