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Sewerage Systems, Hannibal, Missouri. NPDES permit MO0122564, in force until Mar 31, 2030. Last 12 months: over a limit 10 times (last September 2026), 2 of 32 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | BOD, 5-day, 20 deg. C, monthly average | 53.5 | ≤ 30 mg/L | 78% |
| December 2025 | BOD, 5-day, 20 deg. C, weekly average | 53.5 | ≤ 45 mg/L | 19% |
| December 2025 | Nitrogen, ammonia total [as N], daily maximum | 36.5 | ≤ 8.4 mg/L | 335% |
| December 2025 | Nitrogen, ammonia total [as N], monthly average | 36.5 | ≤ 2.2 mg/L | 1559% |
| March 2026 | BOD, 5-day, percent removal, monthly average minimum | 0 | ≥ 85 % | 567% |
| March 2026 | Nitrogen, ammonia total [as N], monthly average | 4.5 | ≤ 2.6 mg/L | 73% |
| March 2026 | Solids, suspended percent removal, monthly average minimum | 0 | ≥ 85 % | 567% |
| June 2026 | Nitrogen, ammonia total [as N], monthly average | 1.9 | ≤ 1.3 mg/L | 46% |
| September 2026 | BOD, 5-day, percent removal, monthly average minimum | 0 | ≥ 85 % | 567% |
| September 2026 | Solids, suspended percent removal, monthly average minimum | 0 | ≥ 85 % | 567% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Rainfall | total | report only (in) | all year | 001 |
| Rainfall | monthly total | report only (in) | all year | 001 |
| Freeboard | total | report only (ft) | all year | 001 |
| Application rate area sprayed | total | report only (acr) | all year | 002 |
| Application rate area sprayed | monthly total | report only (acr) | all year | 002 |
| Application rate, gallons spray irrigation | total | report only (gal) | all year | 002 |
| Application rate, gallons spray irrigation | monthly total | report only (gal) | all year | 002 |
| Spray irrigation | total | report only (hr/d) | all year | 002 |
| Spray irrigation | monthly total | report only (hr/d) | all year | 002 |
| Spray irrigation, application rate | total | report only (in/d) | all year | 002 |
| Spray irrigation, application rate | monthly total | report only (in/d) | all year | 002 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 003 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 003 |
| pH | minimum | ≥ 6.5 SU | all year | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 003 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 003 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | ≤ 15 mg/L | all year | 003 |
| Oil and grease [soxhlet extr.] tot. | monthly average | ≤ 10 mg/L | all year | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.7 mg/L | Jul–Sep | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Oct–Dec | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11.8 mg/L | Jan–Mar | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.7 mg/L | Apr–Jun | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1 mg/L | Jul–Sep | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.2 mg/L | Oct–Dec | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.6 mg/L | Jan–Mar | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.3 mg/L | Apr–Jun | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 003 |
| E. coli | 7-day geometric mean | ≤ 1030 #/100mL | Apr–Dec | 003 |
| E. coli | 30-day geometric mean | ≤ 206 #/100mL | Apr–Dec | 003 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 003 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 003 |
| 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/MO0122564 · MCP: https://passage-data.com/mcp