ZipCheckup grade for 78234: A.

Checked records flag no major concern; missing data is unknown.

Health Violations Found
A 90

San Antonio, TX (78234): PFAS Detected in Mapped Water Systems - 90/100

EPA data for Jbsa Sam Houston

Health Violations Found PFAS Detected

Health-based violation records by water system:

EPA records for the water systems mapped to 78234 in San Antonio, TX contain 3 recorded violations for inclusive record years 2021 through 2026, all mapped systems combined; 1 are marked health-based.

Data source: U.S. Environmental Protection Agency (EPA) SDWIS

Based on EPA Drinking Water FEMA Flood Data U.S. Census CDC Energy Information Admin. USGS Water Data & 9 more federal sources
Latest air quality, EPA records and weather alerts Current data temporarily unavailable
Current EPA violation data unavailable
Water records and current conditions
Current EPA violation data unavailable
Safety Score
A 90/100
Water Quality Issues 1 health-based violation
Lead Risk Below action level 0.001 mg/L, 90th percentile, sample period ending 2025-12-31
NFIP Claim History N/A
Data confidence: High (direct measurement) Medium (sampled / sub-geography) Low (modeled / inferred) Methodology →

At a Glance

  • Water EPA records for water systems mapped to this ZIP show 1 health-based violation and 2 non-health-based (since 2021).
  • Lead The reported 90th-percentile lead result of 0.001 mg/L is below the EPA action level for water systems; EPA's health goal for lead is zero.
  • PFAS PFAS detected in UCMR5 sampling; see the PFAS section for each compound, compared with the federal PFAS MCL where one exists.
  • Radon EPA Zone 3 - county-level radon potential, not evidence of a low home result.
Contaminant Summary
Health Violations
3 violations 1 health-based PFAS detected
Report data assembled: Jul 27, 2026 EPA water-system identity: source date or period is not present in ZipCheckup's accepted source record EPA violation history: more than two update cycles old Lead, copper and UCMR measurements: source date or period is not present in ZipCheckup's accepted source record Consumer Confidence Report: source date or period is not present in ZipCheckup's accepted source record
A
ZIP-level Home Safety model score: 90 / 100
Home Safety Score higher than 81% of ZIP codes nationwide
1
Water System
37,563
People Served
1
Health Violations (since 2021)Median is 0
Groundwater
Water Source
0.001 mg/L
Reported Lead ResultBelow the national median of system results
Zone 3
County Radon Potential · Low

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Score Breakdown

Overall Home Safety Score: 90/100

This is the published model score. Component and domain values are shown independently; they are not added together on this page.

Canonical components

EPA water compliance
92/100
Observed
PFAS MCL screen
100/100
Observed
EPA radon zone
100/100
Observed
Annual EPA AirData AQI
75/100
Observed

Required domains

Drinking water
96/100
Indoor environment
100/100
Outdoor environment
75/100

Coverage: 4 of 4 components and 3 of 3 domains observed.

Model 4.0.0; series home-safety-v4-cross-vertical.

Safety & Health (8) CRITICAL

Your Water System

ZIP code 78234 in San Antonio, Texas is mapped to the water system Jbsa Sam Houston (EPA ID: TX0150116). This system provides water to approximately 37,563 people from groundwater sources.

Other Water Quality Reports in Texas

Nearby Water Quality Reports

Data Sources

This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Jbsa Sam Houston (TX0150116) on EPA.gov.

4 of the top compounds applied across the surrounding county in USGS pesticide-use estimates appear on EPA drinking-water monitoring lists. See the agricultural pesticide-use section.

📊 EPA Safe Drinking Water · View source →

PFAS Contamination Detected

PFAS ("forever chemicals") have been reported in samples from water systems associated with ZIP code 78234.

Detected compounds: PFBA, PFBS, PFPeA.

Highest measured level: 0.0092 µg/L

Reverse osmosis (RO) and activated carbon block filters can reduce PFAS at the tap. Certifications list the compounds covered: an NSF/ANSI 53 or 58 claim for PFOA/PFOS does not cover every PFAS, so check that the product lists the compounds detected here.

📊 EPA UCMR5 · View source →
Environmental Hazards (10) HIGH
Home & Infrastructure (6) OK
Cost & Community (9) HIGH

CPSC product recall notices

These national notices are not matched to this ZIP code or water system.

View all recalls →

📊 CPSC · View source →

Protect Your Home in San Antonio

Based on local data for ZIP 78234, these services may benefit homeowners in your area.

Based on local data for your area. Use the tools below to explore your options.

Gutter Installation & Repair

The median home in 78234 was built around 1984. Aging gutters can cause foundation damage, basement flooding, and mold - a professional assessment can prevent costly repairs.

Typical cost: Gutter installation: typically $1,000–$2,500 for a standard home

Estimate Your Home Maintenance Costs

Window Replacement

The median build year of homes in San Antonio is 1984; check the age and condition of your own windows. ENERGY STAR windows can save $101–$583/year on energy bills.

Typical cost: Window replacement: typically $300–$800 per window installed

Estimate Your Home Maintenance Costs

Roofing Inspection & Repair

Active weather alerts in Texas increase the risk of roof damage from hail and high winds. A professional inspection can identify vulnerabilities.

Typical cost: Roof inspection: typically $75–$300; repairs $300–$1,500

Estimate Your Home Insurance Needs

Service recommendations are based on public data for this ZIP code (FEMA, Census ACS, NWS). Actual needs vary by property. By calling, your information will be shared with an independent service provider. ZipCheckup may receive compensation. Cost estimates are approximate and vary by property, condition, and contractor.

Frequently Asked Questions

Is the tap water in 78234 safe to drink?

EPA SDWIS records 3 violations since 2021 across the water systems mapped to ZIP 78234 (primary system: Jbsa Sam Houston), including 1 health-based. The violation table above shows which system each record belongs to. ZipCheckup last updated this page in July 2026. The federal source release date is unavailable, so that month is not presented as source currency.

Where does 78234's water come from?

The recorded water source for Jbsa Sam Houston, a system mapped to ZIP code 78234, is Groundwater. This system serves approximately 37,563 people.

How does San Antonio water compare to the national average?

San Antonio's Home Safety Score ranks better than 81% of U.S. ZIP codes, and at or above 67% within Texas.

How can I get my water tested in San Antonio?

If Jbsa Sam Houston supplies your home, contact it for its Consumer Confidence Report; otherwise contact the water utility that serves your address, or hire a certified lab for independent home water testing. The EPA recommends annual testing if you use a private well.

Is lead a concern in 78234 tap water?

The Lead and Copper Rule record selected for 78234 reports a 90th-percentile lead result of 0.001 mg/L for a water system mapped to this ZIP (record date 2025-12-31). The EPA action level is 0.015 mg/L. This result is below the EPA action level; it does not show the lead level in each home.

What is the radon risk for 78234?

78234 is mapped to a county in EPA Radon Zone 3 (low county-level radon potential; EPA recommends testing every home), located in Bexar County. EPA radon zones range from Zone 1 (highest county-level potential) to Zone 3 (lowest). Testing your home is recommended regardless of zone.

Are there PFAS (forever chemicals) in 78234's water?

Yes, PFAS have been detected in samples from water systems mapped to 78234. Reverse osmosis and activated carbon filters certified to NSF/ANSI 53 or 58 specifically for PFOA/PFOS reduction can reduce PFAS.

How to cite this page

APA ZipCheckup. (2026). San Antonio, TX (78234): PFAS Detected in Mapped Water Systems - 90/100. https://zipcheckup.com/report/78234/
BibTeX 
@misc{zipcheckup-report-78234,
  author = {{ZipCheckup}},
  title  = {{San Antonio, TX (78234): PFAS Detected in Mapped Water Systems - 90/100}},
  year   = {2026},
  url    = {https://zipcheckup.com/report/78234/}
}

Page version: October 2026.

Nearby ZIP Code Reports

Water quality comparison for ZIP codes near 78234

ZIP Code City, State Distance Grade Violations
78236 Lackland A F B, TX <1 mi A 1
78288 San Antonio, TX <1 mi N/A 0
78205 San Antonio, TX <1 mi A 0
78286 San Antonio, TX <1 mi N/A 0
78212 San Antonio, TX 1.0 mi A 0
78284 San Antonio, TX 1.3 mi N/A 0
78215 San Antonio, TX 1.5 mi A 0
78204 San Antonio, TX 1.5 mi A 0
78287 San Antonio, TX 1.8 mi N/A 0
78207 San Antonio, TX 2.0 mi A 0

Contaminants Detected in 78234

Learn more about the contaminants found in your water supply:

Overall safety breakdown

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2026 Rankings

ZIP 78234 scores in the top tier nationally.

Coverage: 14/17 risk factors Data sources →
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