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Hannibal, MO Tap Water Quality 2026

Water quality report for Hannibal, MO — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Hannibal's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Hannibal Pws PWSID: MO2010344 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 5.28 ppb, 35% of the action level and no violations are open. No PFAS was detected.

C

Hannibal earns a C for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: 5.28 ppb — 35% of the federal action level
PFAS tested, none detected
15 violations since 2015, 6 health-based
No violations currently open
Hannibal's lead level vs. all Missouri community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 5.28 ppb — 35% of the federal action level
✓ Lower lead than 12% of Missouri utilities
Population Served
16018
~7348 connections
Water Source
Surface water
Drawn from surface water — SDWIS source code SW
Active Violations
0
15 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
35% of EPA action level
5.28 ppb
Action level: 15 ppb
The 90th-percentile lead result is 5.28 ppb, 35% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
LEAD AND COPPER RULE REVISIONS REPORTING FAILURE — — 2025 Unaddressed
Revised Total Coliform Rule MCL EXCEEDANCE — — 2023 Archived
Revised Total Coliform Rule MONITORING FAILURE — — 2018 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2018 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2018 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2017 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2017 Resolved
Long Term 2 Enhanced Surface Water Treatment Rule OTHER — — 2016 Resolved
Long Term 2 Enhanced Surface Water Treatment Rule OTHER — — 2016 Resolved
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2016 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2016 Resolved
Long Term 2 Enhanced Surface Water Treatment Rule MONITORING AND REPORTING — — 2016 Resolved
TTHM MCL EXCEEDANCE 96.9 UG/L 0.080 mg/L 2015 Resolved
TTHM MCL EXCEEDANCE 113.78 UG/L 0.080 mg/L 2015 Resolved
TTHM MCL EXCEEDANCE 121.72 UG/L 0.080 mg/L 2015 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

15 violations are on record since 2015, of which 6 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Hannibal Pws
PWSID MO2010344
Water source Surface water — Drawn from surface water — SDWIS source code SW
Population served 16,018
Service connections 7,348
Systems serving this area 2
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Hannibal tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 5.28 ppb, 35% of the action level.
Does Hannibal water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Hannibal? ▼
Hannibal Pws (PWSID MO2010344), one of 2 systems serving this area. Surface water. Drawn from surface water — SDWIS source code SW
When was this system last inspected? ▼
It was last inspected on 2024-08-07. Inspectors recorded 1 significant deficiency.

What Should Hannibal Residents Do?

1
Consider a filter certified for lead
Look for NSF/ANSI 53 certification for lead reduction.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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