Waller County, Texas
7 ZIP codes · Avg score 78/100 · Grade B · Updated 2026-06-03
Within Waller County, all 7 tracked ZIP codes show above-average drinking water safety — violations are infrequent and typically minor.
How Waller County Compares
How Waller County Compares
Waller County scores 4 points below the Texas state average (82/100) and 10 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Waller County, Texas
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 11.6 (asthma 10.3%, diabetes 11.1%)
Estimated additional annual cost per homeowner: $2,810, driven primarily by flood
Infrastructure: 0.271% avg pipe failure probability
31% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↑ Worsening trendEPA violation counts by year across Waller County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 19 violations. Past 5 years: 26 total (26 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: $2,810
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
63,833 housing units in Waller 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 Waller County
Remediation costs are relatively manageable for most homeowners in Waller 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 Waller 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 Waller County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | City of Waller | 5,448 | 46 |
| 2 | G & W Water Supply Corporation | 3,343 | 42 |
| 3 | City of Prairie View | 3,000 | 41 |
| 4 | City of Hempstead | 6,687 | 37 |
| 5 | Rolling Hills Colony Water System | 603 | 37 |
25 total water systems serve Waller County.
All ZIP Codes in Waller County
7 ZIP codes tracked in Waller County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 77466 | Pattison | 92 | A | 6 | $296K |
| 2 | 77446 | Prairie View | 86 | A | 4 (1 health) | $284K |
| 3 | 77423 | Brookshire | 80 | B | 0 | $266K |
| 4 | 77449 | Katy | 78 | B | 1 | $236K |
| 5 | 77445 | Hempstead | 77 | B | 7 (3 health) | $271K |
| 6 | 77447 | Hockley | 76 | B | 5 (1 health) | $296K |
| 7 | 77484 | Waller | 60 | C | 30 (16 health) | $243K |
Recommended Buyer Guides for Waller County
Federal and certification sources drive the ordering: EPA monitoring data, NSF certifications, FEMA flood maps, and CDC lead guidance — guides surface only when county data warrants them.
- 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 Waller County, Texas
Overview
Waller County in Texas covers 7 ZIP codes with an average Home Safety Score of B (78/100).
6 of 7 ZIP codes have recorded EPA violations. 21 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.