Calhoun County, Texas
6 ZIP codes · Avg score 72/100 · Grade B · Updated 2026-06-03
Calhoun County's tap water quality puts it in the upper tier nationally; the 6 ZIP codes here record few health-based violations.
How Calhoun County Compares
How Calhoun County Compares
Calhoun County scores 10 points below the Texas state average (82/100) and 4 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Calhoun County, Texas
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12.7 (asthma 9.2%, diabetes 14.3%)
Estimated additional annual cost per homeowner: $4,557, driven primarily by sea_level
Infrastructure: 0.388% avg pipe failure probability, 40% of ZIPs at high risk
56.8% of homes built before 1978 (lead paint era)
Violation History (2022–2025)
↑ Worsening trendEPA violation counts by year across Calhoun County water systems. Health-based shown in red, total in blue.
Peak year: 2025 with 17 violations. Past 5 years: 34 total (34 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: $4,557
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
24,937 housing units in Calhoun 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 Calhoun County
Remediation costs are relatively manageable for most homeowners in Calhoun 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 Calhoun 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 Calhoun County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Port Oconnor Improvement District | 1,568 | 181 |
| 2 | Seaport Lakes Subdivision | 42 | 151 |
| 3 | City of Port Lavaca | 11,545 | 23 |
| 4 | Gbra Calhoun County Rural Water System | 4,482 | 23 |
| 5 | Port Alto Hoa District 1 | 213 | 23 |
15 total water systems serve Calhoun County.
All ZIP Codes in Calhoun County
6 ZIP codes tracked in Calhoun County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 79241 | Lockney | 87 | A | 0 | $99K |
| 2 | 77983 | Seadrift | 80 | B | 7 | $173K |
| 3 | 77019 | Houston | 79 | B | 1 (1 health) | $725K |
| 4 | 77467 | Pierce | 73 | B | 0 | — |
| 5 | 77982 | Port O Connor | 60 | C | 151 (16 health) | $249K |
| 6 | 77979 | Port Lavaca | 55 | C | 23 (20 health) | $138K |
Recommended Buyer Guides for Calhoun County
While many sites publish identical guide lists across every county they cover, the selection here changes by location — driven by the EPA, NSF, FEMA, and CDC datasets that describe the actual conditions documented for this jurisdiction in the federal record.
- Best Lead Paint Test Kits — 56.8% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Calhoun County, Texas
Overview
Calhoun County in Texas covers 6 ZIP codes with an average Home Safety Score of B (72/100).
4 of 6 ZIP codes have recorded EPA violations. 37 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.