Hannibal Pws
Hannibal, MO · Marion County · Publicly Owned Treatment Works
- Average flow
- 2.69 MGD
- Design flow
- —
- NPDES permit
- MO0093513
- Effective
- Permit expires
- April 2023
- Population served
- 17,312
- CWNS 2022
Hannibal Pws is a publicly owned wastewater treatment plant in Hannibal, Marion County, Missouri treating an average of 2.69 million gallons per day, serving about 17,312 residents. Treatment on site includes clarifiers, biogas balloons, biological treatment, other, biosolids aerobic digestion, biosolids thickening and other unit processes. It discharges under NPDES permit MO0093513 (effective), which expires in April 2023, with 0 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
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Biogas balloons
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Biological Treatment, Other
unit processBiosolids Aerobic Digestion
unit processBiosolids Thickening
unit processDisinfection, chlorine/ chloramine
unit processDisinfection, other chemical
unit processScreening
unit processUnlock exact unit counts →
Compliance snapshot (last 3 years)
- Total violations
- 0
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Capital improvement projects in Hannibal
Hannibal's capital improvement plan lists 36 water, sewer and wastewater line items worth $34M starting 2025–2029. The largest budgeted items are shown here.
All water and sewer capital projects in Hannibal →
| Project | Budget | Years |
|---|---|---|
| Lead Service Line Replacement | $14,880,000 | 2025–2030 |
| Pre-Sedimentation Basin | $3,000,000 | 2028–2030 |
| Downtown Sanitary Sewer Overflow (SSO) Elimination | $2,460,000 | 2025–2030 |
| Grit Chamber / Bar Screen / Influent Pump | $2,000,000 | 2027–2029 |
| Pump House Upgrade | $1,500,000 | 2026–2028 |
Full project details — scope, funding source, engineering consultant and the decision-makers behind each project — are available in Klarifi, along with similar wastewater capital projects in other cities.
Key contacts
Decision-makers at Hannibal Pws.
No verified contacts on file yet
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Nearby wastewater treatment plants in Missouri
New London · 7 mi away
0.07 MGD
Hannibal · 9 mi away
0.56 MGD
Palmyra · 11 mi away
0.22 MGD
Center · 14 mi away
0.04 MGD
Frankford · 14 mi away
0.02 MGD
Monroe City · 20 mi away
0.2 MGD
Bowling Green · 24 mi away
0.44 MGD
Perry · 24 mi away
0.03 MGD
Hannibal Pws: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026; facility record last updated May 20, 2025.