Castro County, Texas
4 ZIP codes · Avg score 63/100 · Grade C · Updated 2026-06-03
Covering 4 ZIP codes, Castro County falls in the average tier for tap water safety — violations appear in a meaningful share of areas, and the data suggests quality depends heavily on which specific part of the county a household sits in.
How Castro County Compares
How Castro County Compares
Castro 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
Key Risk Factors
Health risk index: 13.3 (asthma 9.1%, diabetes 15.5%)
Estimated additional annual cost per homeowner: $675, driven primarily by energy_code_gap
Infrastructure: 0.345% avg pipe failure probability, 25% of ZIPs at high risk
54.8% of homes built before 1978 (lead paint era)
Violation History (2023–2024)
→ Stable trendEPA violation counts by year across Castro County water systems. Health-based shown in red, total in blue.
Peak year: 2023 with 4 violations. Past 5 years: 8 total (8 health-based).
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: $675
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
2,785 housing units in Castro 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 Castro County
Remediation costs are relatively manageable for most homeowners in Castro 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 Castro County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 4 systems in Castro County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Hart Municipal Water System | 1,000 | 11 |
| 2 | Dimmitt Municipal Water System | 4,393 | 4 |
| 3 | Nazareth Municipal Water System | 311 | 4 |
| 4 | HEREFORD MUNICIPAL WATER SYSTEM | 16,048 | 0 |
All ZIP Codes in Castro County
4 ZIP codes tracked in Castro County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 79027 | Dimmitt | 83 | B | 0 | $101K |
| 2 | 79063 | Nazareth | 71 | B | 4 (1 health) | $196K |
| 3 | 79085 | Summerfield | 53 | D | 0 | — |
| 4 | 79043 | Hart | 46 | D | 11 (6 health) | $63K |
Recommended Buyer Guides for Castro County
Eight risk categories drive the selection — PFAS exceedance, lead above EPA action level, pre-1978 housing share, EPA Radon Zone 1, flood-top-risk, wildfire-top-risk, multi-contaminant load, and a baseline fallback — and each category maps to a specific buyer-guide track that surfaces when the county data hits its threshold for that hazard signal.
- Best Lead Paint Test Kits — 54.8% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Overview
Castro County in Texas covers 4 ZIP codes with an average Home Safety Score of C (63/100).
2 of 4 ZIP codes have recorded EPA violations. 7 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.