Wilson County, Texas
7 ZIP codes · Avg score 84/100 · Grade B · Updated 2026-06-03
Across Wilson County's 7 ZIP codes, EPA compliance data shows above-average performance — violation rates are minimal, none of the county's systems have triggered health-based MCL exceedances in recent cycles, and the county's scores have stayed above the national baseline across every recent reporting period.
How Wilson County Compares
How Wilson County Compares
Wilson County scores 2 points above the Texas state average (82/100) and 16 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Wilson County, Texas
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12.4 (asthma 9.4%, diabetes 13.1%)
Estimated additional annual cost per homeowner: $1,809, driven primarily by sea_level
Infrastructure: 0.248% avg pipe failure probability
29.5% of homes built before 1978 (lead paint era)
Violation History (2023–2024)
→ Stable trendEPA violation counts by year across Wilson County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 7 violations. Past 5 years: 8 total (8 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
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $1,809
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
20,279 housing units in Wilson 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 Wilson County
Remediation costs are relatively manageable for most homeowners in Wilson 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 Wilson County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 5 systems in Wilson County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Sunko Water Supply Corporation | 5,064 | 22 |
| 2 | Oak Hills Water Supply Corporation | 6,225 | 16 |
| 3 | Three Oaks Water Supply Corporation | 1,887 | 13 |
| 4 | City of Poth | 2,994 | 13 |
| 5 | Creekwood Estates | 876 | 9 |
16 total water systems serve Wilson County.
All ZIP Codes in Wilson County
7 ZIP codes tracked in Wilson County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 78101 | Adkins | 95 | A | 0 | $273K |
| 2 | 78147 | Poth | 94 | A | 4 (1 health) | $195K |
| 3 | 78160 | Stockdale | 91 | A | 2 (1 health) | $181K |
| 4 | 78114 | Floresville | 86 | A | 9 (1 health) | $274K |
| 5 | 78121 | La Vernia | 85 | A | 7 | $360K |
| 6 | 78161 | Sutherland Springs | 73 | B | 0 | — |
| 7 | 78150 | Randolph A F B | 66 | C | 0 | — |
Recommended Buyer Guides for Wilson County
Eight risk categories drive the selection — PFAS exceedance, lead above EPA action level, pre-1978 housing share, EPA Radon Zone 1, flood-top-risk, wildfire-top-risk, multi-contaminant load, and a baseline fallback — and each category maps to a specific buyer-guide track that surfaces when the county data hits its threshold for that hazard signal.
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Wilson County, Texas
Overview
Wilson County in Texas covers 7 ZIP codes with an average Home Safety Score of B (84/100).
4 of 7 ZIP codes have recorded EPA violations. 3 health-based violations have been documented.
← Back to Texas water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.