Hannibal Pws
700 S Arch St, Hannibal, MO 63401 · Marion County · Publicly Owned Treatment Works
- Average flow
- 3.71 MGD
- Design flow
- —
- NPDES permit
- MO0093513
- Administratively continued
- 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 3.71 million gallons per day, serving about 17,312 residents. It discharges under NPDES permit MO0093513 (administratively continued), which expires in April 2023, with 2 recorded violations in the last three years.
Treatment technology
8 treatment structures and unit processes identified at Hannibal Pws.
Available with a free Klarifi account
See the full treatment train at Hannibal Pws: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 2
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for Hannibal Pws in EPA's ICIS system.
- Formal actions
- 0
- none on record
- EPA inspections
- 1
- latest Mar 2025
No formal federal enforcement case is on record for this plant.
Full case history with a free Klarifi account
Every action against Hannibal Pws with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
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
0.01 MGD
Palmyra · 11 mi away
0.34 MGD
Center · 14 mi away
0.06 MGD
Frankford · 14 mi away
0.02 MGD
Monroe City · 20 mi away
0.44 MGD
Philadelphia · 22 mi away
0.0053 MGD
Bowling Green · 24 mi away
0.57 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 October 12, 2026; facility record last updated May 20, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Lift station · Sludge dewatering · all terms