Jefferson County, Wisconsin
11 ZIP codes · Avg score 62/100 · Grade C
ZipCheckup grade for Jefferson County: C.
A mixed picture - some signals here are worth your attention.
Jefferson County: 11 ZIP codes, mid-range safety grade.
How Jefferson County Compares
How Jefferson County Compares
Jefferson County scores 8 points below the Wisconsin state average (70/100) and 11 points below the national average (73/100).
Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData
ZIP Code Risk Map
Water Quality Map: Jefferson County, Wisconsin
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12.8 (asthma 10.9%, diabetes 10.7%)
Modeled additional annual cost estimate per homeowner: $1,137, largest modeled factor: Flood
59% of homes built before 1980 (lead paint was banned for residential use in 1978)
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Modeled area-level indicator, not a failure probability. Sources: Census ACS housing age, EPA DWINSA infrastructure needs, EPA SDWIS violations, and EPA lead indicators.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $1,137
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
35,343 housing units in Jefferson County
Source: U.S. Census Bureau ACS B25034 (Year Structure Built).
Water Safety Affordability
How much it costs to fix water issues relative to home values in Jefferson County
Modeled remediation costs in Jefferson County can be compared with the median property value; actual costs vary by property.
Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.
Health Outcomes vs National Average
CDC PLACES data for Jefferson County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems mapped to Jefferson County ZIP codes
8 community water systems mapped to Jefferson County ZIP codes; EPA may list more systems serving the county.
- C
- D
- C
- C
- C
- C
Show all 8 water systems
- C
- C
16 water systems mapped to Jefferson County ZIP codes in our data; EPA may list more systems serving the county.
Systems with the most violations in Jefferson County
5 water systems with violations in EPA records.
- C
- C
- C
- D
All ZIP Codes in Jefferson County
11 ZIP codes tracked in Jefferson County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 53094 | Watertown | 66 | C | 3 | $224K |
| 2 | 53551 | Lake Mills | 66 | C | 2 (1 health) | $323K |
| 3 | 53594 | Waterloo | 66 | C | 1 | $237K |
| 4 | 53538 | Fort Atkinson | 65 | C | 10 (8 health) | $228K |
| 5 | 53549 | Jefferson | 61 | C | 19 (8 health) | $247K |
| 6 | 53156 | Palmyra | 49 | D | 3 | $236K |
| 7 | 53036 | Ixonia | — | — | 0 | $347K |
| 8 | 53038 | Johnson Creek | — | — | 12 (1 health) | $299K |
| 9 | 53137 | Helenville | — | — | 11 (1 health) | $329K |
| 10 | 53178 | Sullivan | — | — | $338K | |
| 11 | 53523 | Cambridge | — | — | 7 (2 health) | $308K |
Recommended Buyer Guides for Jefferson County
Nothing on this list means a problem exists in your own home: the matches are drawn from county- and ZIP-level records, so a guide shows up because of an area signal, and only testing at your tap describes a specific household.
- Best Lead Paint Test Kits — 59% of homes built before 1980
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
- Best Sump Pumps — Flood is the top compound risk factor
- Best Mold Test Kits — Flood-driven moisture and mold risk
Deep Dive Reports
Detailed analysis for Jefferson County, Wisconsin
Overview
Jefferson County in Wisconsin covers 11 tracked ZIP records with an average Home Safety Score of C (62/100) across 6 scored records.
9 of 10 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 11 health-based violations appear in the available health breakdown.
← Back to Wisconsin Home Safety Profile
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- PFAS screening: EPA UCMR 5
- Radon zones: EPA Map of Radon Zones
- Air quality: EPA AirData annual AQI
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Reporting periods vary by source. Missing data is shown as unavailable, not as zero.