Washtenaw County, Michigan
19 ZIP codes · Avg score 64/100 · Grade C
ZipCheckup grade for Washtenaw County: C.
A mixed picture - some signals here are worth your attention.
A middle-tier grade covers Washtenaw County's 19 ZIP codes; documented violations, where present, are worth reviewing system by system.
How Washtenaw County Compares
How Washtenaw County Compares
Washtenaw County scores 21 points below the Michigan state average (85/100) 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: Washtenaw County, Michigan
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 10.4 (asthma 10.6%, diabetes 8.7%)
Modeled additional annual cost estimate per homeowner: $1,001, largest modeled factor: Flood
53% 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: $1,001
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
151,771 housing units in Washtenaw 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 Washtenaw County
Modeled remediation costs in Washtenaw 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 Washtenaw County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems mapped to Washtenaw County ZIP codes
8 community water systems mapped to Washtenaw County ZIP codes; EPA may list more systems serving the county.
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- C
- C
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- C
Show all 8 water systems
- C
- C
21 water systems mapped to Washtenaw County ZIP codes in our data; EPA may list more systems serving the county.
Systems with the most violations in Washtenaw County
5 water systems with violations in EPA records.
- C
- C
All ZIP Codes in Washtenaw County
19 ZIP codes tracked in Washtenaw County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 48104 | Ann Arbor | 67 | C | 0 | $482K |
| 2 | 48109 | Ann Arbor | 67 | C | 0 | — |
| 3 | 48118 | Chelsea | 67 | C | 0 | $349K |
| 4 | 48191 | Willis | 66 | C | 2 | $276K |
| 5 | 48108 | Ann Arbor | 65 | C | 5 | $378K |
| 6 | 48176 | Saline | 65 | C | 5 | $385K |
| 7 | 48197 | Ypsilanti | 65 | C | 4 | $274K |
| 8 | 48130 | Dexter | 64 | C | 6 | $453K |
| 9 | 48103 | Ann Arbor | 62 | C | 11 | $455K |
| 10 | 48105 | Ann Arbor | 62 | C | 11 (1 health) | $486K |
| 11 | 48198 | Ypsilanti | 55 | C | 32 (2 health) | $178K |
| 12 | 48106 | Ann Arbor | — | — | — | |
| 13 | 48107 | Ann Arbor | — | — | — | |
| 14 | 48113 | Ann Arbor | — | — | — | |
| 15 | 48115 | Bridgewater | — | — | — | |
| 16 | 48158 | Manchester | — | — | 0 | $298K |
| 17 | 48175 | Salem | — | — | — | |
| 18 | 48189 | Whitmore Lake | — | — | 32 (4 health) | $286K |
| 19 | 48190 | Whittaker | — | — | $220K |
Recommended Buyer Guides for Washtenaw County
These buyer guides are matched by rule rather than by hand - a PFAS record adds a PFAS filter guide, a lead action-level exceedance adds lead filter guides, a high share of pre-1978 homes adds lead paint test kits, EPA Radon Zone 1 add radon kits, and a top flood or wildfire risk adds related equipment.
- Water Filters Certified for PFAS Reduction — PFAS detected in 1 ZIP code
- Best Lead Paint Test Kits — 53% 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
Deep Dive Reports
Detailed analysis for Washtenaw County, Michigan
Overview
Washtenaw County in Michigan covers 19 tracked ZIP records with an average Home Safety Score of C (64/100) across 11 scored records.
9 of 13 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 6 health-based violations appear in the available health breakdown.
← Back to Michigan 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.