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Sewage treatment plant, Williamsville, Missouri. NPDES permit MO0090654 expired Mar 31, 2025; its limits still apply. Last 12 months: over a limit 14 times (last July 2026), 2 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Solids, suspended percent removal, monthly average minimum | 71 | ≥ 85 % | 93% |
| December 2025 | BOD, 5-day, percent removal, monthly average minimum | 73 | ≥ 85 % | 80% |
| January 2026 | BOD, 5-day, percent removal, monthly average minimum | 68 | ≥ 85 % | 113% |
| January 2026 | Solids, suspended percent removal, monthly average minimum | 60 | ≥ 85 % | 167% |
| February 2026 | BOD, 5-day, percent removal, monthly average minimum | 76 | ≥ 85 % | 60% |
| March 2026 | BOD, 5-day, percent removal, monthly average minimum | 43 | ≥ 85 % | 280% |
| March 2026 | Solids, suspended percent removal, monthly average minimum | 80 | ≥ 85 % | 33% |
| April 2026 | BOD, 5-day, percent removal, monthly average minimum | 58 | ≥ 85 % | 180% |
| April 2026 | Solids, suspended percent removal, monthly average minimum | .09 | ≥ 85 % | 566% |
| May 2026 | BOD, 5-day, percent removal, monthly average minimum | 77 | ≥ 85 % | 53% |
| May 2026 | Nitrogen, ammonia total [as N], monthly average | 3.46 | ≤ 2.3 mg/L | 50% |
| May 2026 | Solids, suspended percent removal, monthly average minimum | 0 | ≥ 85 % | 567% |
| June 2026 | Solids, suspended percent removal, monthly average minimum | 74 | ≥ 85 % | 73% |
| July 2026 | Solids, suspended percent removal, monthly average minimum | 83 | ≥ 85 % | 13% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 002 |
| pH | minimum | ≥ 6.5 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 002 |
| Solids, total suspended | monthly average | ≤ 30 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 | ≤ 12.1 mg/L | Jul | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Aug | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Jun | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Sep | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Oct | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Jul | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.6 mg/L | Aug | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.8 mg/L | Jun | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.3 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.1 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.9 mg/L | Sep | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.8 mg/L | Oct | 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 | ≤ 630 #/100mL | Apr–Oct | 002 |
| E. coli | 30-day geometric mean | ≤ 126 #/100mL | Apr–Oct | 002 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 002 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | 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/MO0090654 · MCP: https://passage-data.com/mcp