Johnson County, Iowa
13 ZIP codes · Avg score 64/100 · Grade C
ZipCheckup grade for Johnson County: C.
A mixed picture - some signals here are worth your attention.
Johnson County receives a C, the middle grade on the A-F scale, with 13 ZIP codes tracked.
How Johnson County Compares
How Johnson County Compares
Johnson County scores 1 points above the Iowa state average (63/100) and 9 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: Johnson County, Iowa
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 10.5 (asthma 9.8%, diabetes 8.8%)
Modeled additional annual cost estimate per homeowner: $1,089, largest modeled factor: Flood
38% 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: $1,089
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
64,226 housing units in Johnson 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 Johnson County
Modeled remediation costs in Johnson 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 Johnson County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems mapped to Johnson County ZIP codes
8 community water systems mapped to Johnson County ZIP codes; EPA may list more systems serving the county.
- C
- C
- C
- C
- C
- C
Show all 8 water systems
- C
- C
15 water systems mapped to Johnson County ZIP codes in our data; EPA may list more systems serving the county.
Systems with the most violations in Johnson County
5 water systems with violations in EPA records.
- C
- C
- C
- C
All ZIP Codes in Johnson County
13 ZIP codes tracked in Johnson County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 52241 | Coralville | 67 | C | 0 | $286K |
| 2 | 52242 | Iowa City | 67 | C | 0 | — |
| 3 | 52317 | North Liberty | 66 | C | 3 | $315K |
| 4 | 52246 | Iowa City | 63 | C | 8 | $327K |
| 5 | 52245 | Iowa City | 62 | C | 10 | $293K |
| 6 | 52240 | Iowa City | 57 | C | 20 | $241K |
| 7 | 52235 | Hills | — | — | $218K | |
| 8 | 52243 | Iowa City | — | — | — | |
| 9 | 52244 | Iowa City | — | — | — | |
| 10 | 52322 | Oxford | — | — | 0 | $249K |
| 11 | 52333 | Solon | — | — | 3 (1 health) | $348K |
| 12 | 52338 | Swisher | — | — | 4 (1 health) | $385K |
| 13 | 52340 | Tiffin | — | — | 0 | $318K |
Recommended Buyer Guides for Johnson County
Which guides appear depends on what the county data show.
- 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 Johnson County, Iowa
Overview
Johnson County in Iowa covers 13 tracked ZIP records with an average Home Safety Score of C (64/100) across 6 scored records.
6 of 10 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 1 health-based violation appear in the available health breakdown.
← Back to Iowa 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.