San Patricio County, Texas
9 ZIP codes · Avg score 77/100 · Grade B · Updated 2026-06-04
The 9 water systems serving San Patricio County show strong compliance with federal drinking water standards.
How San Patricio County Compares
How San Patricio County Compares
San Patricio County scores 5 points below the Texas state average (82/100) and 9 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
ZIP Code Risk Map
Water Quality Map: San Patricio County, Texas
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.7 (asthma 9.6%, diabetes 15.4%)
Estimated additional annual cost per homeowner: $5,533, driven primarily by sea_level
Infrastructure: 0.356% avg pipe failure probability, 22% of ZIPs at high risk
55% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
→ Stable trendEPA violation counts by year across San Patricio County water systems. Health-based shown in red, total in blue.
Peak year: 2021 with 20 violations. Past 5 years: 67 total (67 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: $5,533
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
32,937 housing units in San Patricio 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 San Patricio County
Remediation costs are relatively manageable for most homeowners in San Patricio 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 San Patricio 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 San Patricio County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Rincon Water Supply Corporation | 4,734 | 73 |
| 2 | City of Odem | 2,250 | 54 |
| 3 | Seaboard Water Supply Corporation | 420 | 54 |
| 4 | City of Aransas Pass | 8,088 | 26 |
| 5 | City of Ingleside | 10,106 | 26 |
21 total water systems serve San Patricio County.
All ZIP Codes in San Patricio County
9 ZIP codes tracked in San Patricio County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 78352 | Edroy | 99 | A | 0 | — |
| 2 | 78359 | Gregory | 81 | B | 5 (1 health) | $97K |
| 3 | 78370 | Odem | 80 | B | 42 (2 health) | $191K |
| 4 | 78362 | Ingleside | 79 | B | 23 (1 health) | $183K |
| 5 | 78387 | Sinton | 79 | B | 12 (1 health) | $122K |
| 6 | 78336 | Aransas Pass | 76 | B | 3 (1 health) | $204K |
| 7 | 78374 | Portland | 71 | B | 16 (9 health) | $226K |
| 8 | 78383 | Sandia | 65 | C | 0 | $228K |
| 9 | 78368 | Mathis | 60 | C | 25 (12 health) | $87K |
Recommended Buyer Guides for San Patricio 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 — 55% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for San Patricio County, Texas
Overview
San Patricio County in Texas covers 9 ZIP codes with an average Home Safety Score of B (77/100).
7 of 9 ZIP codes have recorded EPA violations. 27 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.