Williamson County, Texas
26 ZIP codes · Home Safety Score unavailable · 0 of 26 tracked ZIP records scored
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: Williamson County, Texas
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%, diabetes 9.8%)
Modeled additional annual cost estimate per homeowner: $1,172, largest modeled factor: Flood
12% 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: $1,172
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
216,492 housing units in Williamson 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 Williamson County
Modeled remediation costs in Williamson 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 Williamson County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems mapped to Williamson County ZIP codes
8 community water systems mapped to Williamson County ZIP codes; EPA may list more systems serving the county.
Show all 8 water systems
34 water systems mapped to Williamson County ZIP codes in our data; EPA may list more systems serving the county.
Systems with the most violations in Williamson County
5 water systems with violations in EPA records.
All ZIP Codes in Williamson County
26 ZIP codes tracked in Williamson County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 76511 | Bartlett | — | — | 15 (2 health) | $180K |
| 2 | 76527 | Florence | — | — | 22 (7 health) | $370K |
| 3 | 76530 | Granger | — | — | 12 (1 health) | $277K |
| 4 | 76537 | Jarrell | — | — | 28 (6 health) | $272K |
| 5 | 76573 | Schwertner | — | — | — | |
| 6 | 76574 | Taylor | — | — | 13 (6 health) | $252K |
| 7 | 76577 | Thorndale | — | — | 17 (5 health) | $185K |
| 8 | 76578 | Thrall | — | — | 12 (6 health) | $316K |
| 9 | 78613 | Cedar Park | — | — | 14 (1 health) | $462K |
| 10 | 78626 | Georgetown | — | — | 10 (1 health) | $359K |
| 11 | 78628 | Georgetown | — | — | 20 (5 health) | $468K |
| 12 | 78630 | Cedar Park | — | — | — | |
| 13 | 78633 | Georgetown | — | — | 23 (6 health) | $444K |
| 14 | 78634 | Hutto | — | — | 14 (5 health) | $334K |
| 15 | 78642 | Liberty Hill | — | — | 28 (5 health) | $487K |
| 16 | 78664 | Round Rock | — | — | 17 (8 health) | $317K |
| 17 | 78665 | Round Rock | — | — | 9 (1 health) | $439K |
| 18 | 78673 | Walburg | — | — | — | |
| 19 | 78674 | Weir | — | — | $43K | |
| 20 | 78680 | Round Rock | — | — | — | |
| 21 | 78681 | Round Rock | — | — | 26 (3 health) | $460K |
| 22 | 78682 | Round Rock | — | — | — | |
| 23 | 78683 | Round Rock | — | — | — | |
| 24 | 78717 | Austin | — | — | 2 (1 health) | $599K |
| 25 | 78729 | Austin | — | — | 1 (1 health) | $435K |
| 26 | 78767 | Austin | — | — | — |
Recommended Buyer Guides for Williamson County
When no specific signal shows up in the records, the list falls back to general water testing and filtration guides rather than staying empty.
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- 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 Williamson County, Texas
Overview
Williamson County in Texas covers 26 tracked ZIP records. No Home Safety Score is published because the required model evidence is incomplete for every tracked record; missing evidence is not treated as zero.
18 of 18 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 23 health-based violations appear in the available health breakdown.
← Back to Texas 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.