Williamson County, Tennessee
12 ZIP codes · Avg score 54/100 · Grade D · Updated
ZipCheckup grade for Williamson County: D.
Several federal signals point to home-safety risks in this ZIP.
State safety rankings put Williamson County near the bottom - 12 ZIP codes, below-average compliance.
How Williamson County Compares
How Williamson County Compares
Williamson County scores 18 points below the Tennessee state average (72/100) and 19 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 Last verified:
ZIP Code Risk Map
Water Quality Map: Williamson County, Tennessee
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 11.3 (asthma 9.8%, diabetes 10%)
Estimated additional annual cost per homeowner: $1,214, driven primarily by flood
27.2% of homes built before 1978 (lead paint era)
Violation History (2022–2023)
→ Stable trendEPA violation counts by year across Williamson County water systems. Health-based shown in red, total in blue.
Peak year: 2022 with 14 violations. Past 5 years: 21 total (21 health-based).
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
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 DWINS infrastructure needs, EPA SDWIS violations, and EPA lead indicators.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $1,214
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
91,015 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
Remediation costs are relatively manageable for most homeowners in Williamson County, representing a small fraction of property value.
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 serving Williamson County
8 community water systems serving Williamson County.
- D
- D
- D
- D
- C
Show all 8 water systems
- D
- D
13 total water systems serve Williamson County.
Systems with the most violations in Williamson County
5 water systems with recorded EPA violations.
- D
- D
- D
- C
All ZIP Codes in Williamson County
12 ZIP codes tracked in Williamson County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 37064 | Franklin | 61 | C | 11 (3 health) | $664K |
| 2 | 37067 | Franklin | 61 | C | 11 (3 health) | $686K |
| 3 | 37069 | Franklin | 61 | C | 11 (3 health) | $713K |
| 4 | 37027 | Brentwood | 60 | C | 14 (3 health) | $845K |
| 5 | 37014 | Arrington | 50 | D | 0 | $651K |
| 6 | 37135 | Nolensville | 48 | D | 5 | $629K |
| 7 | 37179 | Thompsons Station | 45 | D | 10 (3 health) | $502K |
| 8 | 37046 | College Grove | 43 | D | 11 (3 health) | $843K |
| 9 | 37024 | Brentwood | — | — | — | |
| 10 | 37062 | Fairview | — | — | 11 (3 health) | $345K |
| 11 | 37065 | Franklin | — | — | — | |
| 12 | 37068 | Franklin | — | — | — |
Recommended Buyer Guides for Williamson County
Retailer arrangements don't shape what appears here - the selection logic is independent, filtered against EPA detections and the federal hazard data on file for this county.
- 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 Williamson County, Tennessee
Overview
Williamson County in Tennessee covers 12 tracked ZIP records with an average Home Safety Score of D (54/100) across 8 scored records.
8 of 9 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 3 health-based violations appear in the available health breakdown.
← Back to Tennessee 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.
What You Can Do
Williamson County has a grade of D. Here are steps to protect your household.
Test your tap water
Order a certified lab test kit ($20-$50) to check for lead, bacteria, and other contaminants specific to your ZIP code.
Consider a certified water filter
NSF-certified filters can remove most common contaminants. Match the filter to your test results for best protection. Try our filter matcher
Contact your water utility
Request the latest Consumer Confidence Report (CCR) from your water provider. It details exactly what was found in your water supply.