Guadalupe County, Texas
7 ZIP codes · Avg score 76/100 · Grade B · Updated 2026-06-03
Based on current EPA data, Guadalupe County's 7 ZIP codes maintain an above-average drinking water safety record.
How Guadalupe County Compares
How Guadalupe County Compares
Guadalupe 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: Guadalupe 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 (asthma 9.5%, diabetes 12.8%)
Estimated additional annual cost per homeowner: $1,957, driven primarily by flood
Infrastructure: 0.313% avg pipe failure probability
42.8% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↑ Worsening trendEPA violation counts by year across Guadalupe County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 20 violations. Past 5 years: 33 total (33 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: $1,957
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
40,640 housing units in Guadalupe 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 Guadalupe County
Remediation costs are relatively manageable for most homeowners in Guadalupe 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 Guadalupe 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 Guadalupe County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | SPRINGS HILL SUD | 35,472 | 26 |
| 2 | Green Valley Special Utility District | 52,497 | 20 |
| 3 | City of Cibolo | 20,331 | 20 |
| 4 | City of Seguin | 32,736 | 20 |
| 5 | Country Living Estates | 69 | 20 |
19 total water systems serve Guadalupe County.
All ZIP Codes in Guadalupe County
7 ZIP codes tracked in Guadalupe County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 78156 | Seguin | 92 | A | 10 (3 health) | — |
| 2 | 78622 | Fentress | 90 | A | 0 | $173K |
| 3 | 78124 | Marion | 87 | A | 6 | $282K |
| 4 | 78154 | Schertz | 72 | B | 4 | $296K |
| 5 | 78155 | Seguin | 72 | B | 10 (3 health) | $246K |
| 6 | 78115 | Geronimo | 66 | C | 0 | — |
| 7 | 78123 | Mc Queeney | 55 | C | 0 | $239K |
Recommended Buyer Guides for Guadalupe County
Strictly editorial — no paid placements influence which guides appear; the selection draws on NSF certifications and EPA detection records for water systems serving this county.
- 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 Guadalupe County, Texas
Overview
Guadalupe County in Texas covers 7 ZIP codes with an average Home Safety Score of B (76/100).
4 of 7 ZIP codes have recorded EPA violations. 6 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.