Galveston County, Texas
25 ZIP codes · Avg score 75/100 · Grade B · Updated 2026-06-03
Water utilities serving Galveston County's 25 ZIP codes have built a consistent compliance record — the county's above-average grade reflects years of data showing low violation rates and no systemic health concerns.
How Galveston County Compares
How Galveston County Compares
Galveston County scores 7 points below the Texas state average (82/100) and 7 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Galveston County, Texas
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12.3 (asthma 9.8%, diabetes 12.3%)
Estimated additional annual cost per homeowner: $4,706, driven primarily by sea_level
Infrastructure: 0.324% avg pipe failure probability, 14% of ZIPs at high risk
49.7% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↑ Worsening trendEPA violation counts by year across Galveston County water systems. Health-based shown in red, total in blue.
Peak year: 2023 with 25 violations. Past 5 years: 77 total (77 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: $4,706
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
168,576 housing units in Galveston 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 Galveston County
Remediation costs are relatively manageable for most homeowners in Galveston 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 Galveston 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 Galveston County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Galveston County Wcid 8 | 7,065 | 71 |
| 2 | City of Texas City | 54,357 | 63 |
| 3 | CITY OF LEAGUE CITY | 128,412 | 57 |
| 4 | City of La Marque | 15,154 | 56 |
| 5 | City of Hitchcock | 8,379 | 51 |
51 total water systems serve Galveston County.
All ZIP Codes in Galveston County
25 ZIP codes tracked in Galveston County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 75265 | Dallas | 94 | A | 3 | — |
| 2 | 77836 | Caldwell | 89 | A | 21 (1 health) | $199K |
| 3 | 77555 | Galveston | 88 | A | 1 | — |
| 4 | 77592 | Texas City | 88 | A | 4 (2 health) | — |
| 5 | 75764 | Gallatin | 87 | A | 0 | $99K |
| 6 | 77552 | Galveston | 83 | B | 1 | — |
| 7 | 77553 | Galveston | 83 | B | 1 | — |
| 8 | 76632 | Chilton | 79 | B | 14 (2 health) | $95K |
| 9 | 77549 | Friendswood | 78 | B | 0 | — |
| 10 | 77517 | Santa Fe | 76 | B | 20 (1 health) | $266K |
| 11 | 77574 | League City | 75 | B | 20 (12 health) | — |
| 12 | 77539 | Dickinson | 73 | B | 17 (2 health) | $246K |
| 13 | 77550 | Galveston | 73 | B | 1 | $284K |
| 14 | 77551 | Galveston | 73 | B | 1 | $278K |
| 15 | 77554 | Galveston | 73 | B | 1 | $431K |
| 16 | 77568 | La Marque | 73 | B | 2 | $209K |
| 17 | 77590 | Texas City | 73 | B | 4 (2 health) | $168K |
| 18 | 77591 | Texas City | 73 | B | 4 (2 health) | $205K |
| 19 | 77518 | Bacliff | 72 | B | 0 | $168K |
| 20 | 77510 | Santa Fe | 71 | B | 20 (1 health) | $281K |
| 21 | 77563 | Hitchcock | 68 | C | 12 (4 health) | $199K |
| 22 | 77546 | Friendswood | 63 | C | 0 | $354K |
| 23 | 76624 | Axtell | 62 | C | 46 (39 health) | $147K |
| 24 | 77573 | League City | 60 | C | 20 (12 health) | $342K |
| 25 | 77650 | Port Bolivar | 50 | D | 0 | $364K |
Recommended Buyer Guides for Galveston County
Editorial-only picks, screened against the EPA detections on file.
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Galveston County, Texas
Overview
Galveston County in Texas covers 25 ZIP codes with an average Home Safety Score of B (75/100).
20 of 25 ZIP codes have recorded EPA violations. 80 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.