Llano County, Texas
6 ZIP codes · Avg score 63/100 · Grade C · Updated 2026-06-03
Llano County's water quality grade reflects a middle-ground assessment — its 6 ZIP codes range from fully compliant to violation-flagged.
How Llano County Compares
How Llano County Compares
Llano County scores 19 points below the Texas state average (82/100) and 5 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Llano County, Texas
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 15.1 (asthma 9.8%, diabetes 15.3%)
Estimated additional annual cost per homeowner: $2,558, driven primarily by flood
Infrastructure: 0.35% avg pipe failure probability, 17% of ZIPs at high risk
54.5% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↑ Worsening trendEPA violation counts by year across Llano County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 12 violations. Past 5 years: 20 total (20 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: $2,558
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
12,263 housing units in Llano 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 Llano County
Remediation costs are relatively manageable for most homeowners in Llano 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 Llano 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 Llano County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | LAKE FRONT BUCHANAN | 69 | 19 |
| 2 | Kingsland Water Supply Corporation | 12,975 | 19 |
| 3 | 3 G Water Supply Corporation | 550 | 19 |
| 4 | City of Horseshoe Bay | 12,729 | 18 |
| 5 | Llano County Municipal Utility District 1 | 747 | 18 |
8 total water systems serve Llano County.
All ZIP Codes in Llano County
6 ZIP codes tracked in Llano County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 78643 | Llano | 73 | B | 0 | $309K |
| 2 | 78609 | Buchanan Dam | 71 | B | 19 (4 health) | $276K |
| 3 | 78672 | Tow | 63 | C | 0 | $191K |
| 4 | 78657 | Horseshoe Bay | 62 | C | 18 (6 health) | $470K |
| 5 | 78607 | Bluffton | 53 | D | 0 | $353K |
| 6 | 78663 | Round Mountain | 53 | D | 0 | — |
Recommended Buyer Guides for Llano County
Filtered against EPA monitoring data and CDC lead-exposure guidance, the guides below skip the generic catalog and connect directly to the contaminants and hazards on file here.
- Best Lead Paint Test Kits — 54.5% 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 Llano County, Texas
Overview
Llano County in Texas covers 6 ZIP codes with an average Home Safety Score of C (63/100).
2 of 6 ZIP codes have recorded EPA violations. 10 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.