Limestone County, Texas
7 ZIP codes · Avg score 76/100 · Grade B · Updated 2026-06-03
Across all 7 ZIP codes in Limestone County, tap water consistently meets or exceeds federal safety standards.
How Limestone County Compares
How Limestone County Compares
Limestone County scores 6 points below the Texas state average (82/100) and 8 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Limestone County, Texas
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 15.2 (asthma 10.5%, diabetes 16.1%)
Estimated additional annual cost per homeowner: $1,073, driven primarily by flood
Infrastructure: 0.384% avg pipe failure probability, 43% of ZIPs at high risk
59.6% of homes built before 1978 (lead paint era)
Violation History (2022–2025)
↑ Worsening trendEPA violation counts by year across Limestone County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 40 violations. Past 5 years: 82 total (82 health-based). Health-based violations are rising versus the prior 2-year window — worth closer monitoring.
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: $1,073
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
10,177 housing units in Limestone 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 Limestone County
Remediation costs are relatively manageable for most homeowners in Limestone 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 Limestone 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 Limestone County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | City of Mexia | 7,459 | 105 |
| 2 | Point Enterprise Water Supply Corporation | 2,388 | 105 |
| 3 | White Rock Water Supply Corporation 1 Forest Glade | 1,800 | 105 |
| 4 | City of Groesbeck | 4,250 | 105 |
| 5 | White Rock Water Supply Corporation 3 West Lake Mexia | 696 | 105 |
16 total water systems serve Limestone County.
All ZIP Codes in Limestone County
7 ZIP codes tracked in Limestone County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 76686 | Tehuacana | 99 | A | 0 | $125K |
| 2 | 76653 | Kosse | 95 | A | 6 | $157K |
| 3 | 76687 | Thornton | 87 | A | 2 | $256K |
| 4 | 76667 | Mexia | 77 | B | 9 (3 health) | $120K |
| 5 | 76635 | Coolidge | 66 | C | 0 | $146K |
| 6 | 76678 | Prairie Hill | 55 | C | 26 (19 health) | $172K |
| 7 | 76642 | Groesbeck | 53 | D | 96 (22 health) | $189K |
Recommended Buyer Guides for Limestone County
Filtered against federal data, fitted to local risks.
- Best Lead Paint Test Kits — 59.6% of homes built before 1978
- 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 Limestone County, Texas
Overview
Limestone County in Texas covers 7 ZIP codes with an average Home Safety Score of B (76/100).
5 of 7 ZIP codes have recorded EPA violations. 44 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.