Mount Calvary, WI: High Radon Risk — 66/100 (2026)
1 ZIP code · 2 water systems · Updated 2026-06-03
Mount Calvary's water quality grade in WI reflects a middle-ground assessment — service areas range from fully compliant to violation-flagged in current EPA records.
How Mount Calvary Compares
Data: EPA SDWIS Last verified: 2026-06-03
What You Should Know About Mount Calvary Water
- Average lead level: 0.0004 mg/L.
- Homes built before 1986: 80% — older plumbing may contain lead solder.
- Estimated remediation: $1,200 per household.
- CDC health risk index: 13.66 — above typical levels.
Who Supplies Your Water in Mount Calvary
Structurally, Mount Calvary, WI's water supply is divided. Federal data identifies 2 water systems in the area, with 2 providers serving the bulk of residential connections. These utilities operate independently, meaning rate-setting authority and EPA compliance accountability are distributed rather than centralized.
Overview
We track water quality and home safety data for 1 ZIP code in Mount Calvary, Wisconsin (population ~1,905), covering 2 community water systems serving approximately 44,781 people region-wide.
No EPA violations recorded across any ZIP codes in Mount Calvary — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Mount Calvary: C (66/100)
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
Mount Calvary water systems draw from: Groundwater.
Lead & Copper
- Average lead level (90th percentile): 0.0004 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 1 (High 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 |
|---|---|---|---|
| 53057 | C | FOND DU LAC WATERWORKS | 44,303 |
All ZIP Codes in Mount Calvary
- 53057 [C]
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.
Health Outcomes in Mount Calvary
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
Housing & Infrastructure in Mount Calvary
With 80% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
When a city's housing median build year is 1965, as in Mount Calvary, the implication for water quality research is straightforward: municipal-level data captures what leaves the treatment plant, but household plumbing from before 1986 determines what actually arrives at the tap. In cities where older housing predominates, that gap between system-level and household-level data is widest.
Over half of homes in Mount Calvary were built before 1986, when lead solder was banned. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
Cost Context: What Remediation Means for Mount Calvary Homeowners
The household financial picture for Mount Calvary homeowners is proportionally favorable — addressing documented issues claims a small slice of equity, and the cost-to-value ratio puts this area well within the manageable tier.
Remediation costs in Mount Calvary are relatively low compared to home values. The $800–$1,500 estimated range is a small fraction of median property value. Home values are 0% above the Wisconsin average.
Lead Exposure Risk for Children in Mount Calvary
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
After the federal action removing lead-bearing solder from new plumbing took effect, building practice shifted — but 80% of the Mount Calvary inventory predates that line. With aggregate samples near or beyond 0.015 mg/L, an in-home check moves out of the optional column into the standard list.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
What You Can Do in Mount Calvary
- 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. With 80% of homes built before 1986, lead solder is a real possibility.
Deep Dive Reports
Detailed analysis for Mount Calvary, WI