Hannibal, WI Water Safety: 53/100 (2026)
1 ZIP code · 1 water system · Updated 2026-06-03
State safety rankings put Hannibal, WI near the lower tier — below-average compliance on record.
How Hannibal Compares
Data: EPA SDWIS Last verified: 2026-06-03
Key Facts for Hannibal Residents
- Estimated remediation: $400 per household.
- CDC health risk index: 14.79 — above typical levels.
Hannibal's Water Providers
Because residential water in Hannibal, WI flows primarily through a single utility, infrastructure decisions, rate-setting, and EPA compliance are all managed within one organizational structure. Federal records show 1 system active in the area, but one provider dominates the service landscape for most homes and apartments.
Overview
We track water quality and home safety data for 1 ZIP code in Hannibal, Wisconsin, covering 1 community water system serving approximately 372 people.
No EPA violations recorded across any ZIP codes in Hannibal — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Hannibal: D (53/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Hannibal water systems draw from: Groundwater.
Lead & Copper
- Lead data: not yet available for Hannibal
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 54439 | D | GILMAN WATERWORKS | 372 |
All ZIP Codes in Hannibal
- 54439 [D]
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
Hannibal Community Health Snapshot
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
What You Can Do in Hannibal
- Test your water at home. City-level data shows averages — your tap may differ. NSF-certified test kits cost $20-40 and give results in days.
- Install a certified water filter. An NSF-certified pitcher or under-sink filter removes most common contaminants.
- Check your home's plumbing. Homes built before 1986 may have lead solder in pipes. A licensed plumber can assess your risk.
- Review your water system's CCR. Your utility publishes an annual Consumer Confidence Report with detailed test results. Request it or find it online.
Deep Dive Reports
Detailed analysis for Hannibal, WI