San Antonio
Is San Antonio tap water safe to drink?
Generally acceptable, but review local hotspots — score 74/100. This report aggregates EPA drinking water data across 9 local systems in San Antonio. We found 889 total violations (99 unresolved).
🛡️ Home Water Treatment Needs
Should you invest in filtration or softening for your home in San Antonio?
Expert Advice
Given the safety margin, a Carbon Block or sediment filter is recommended to improve taste and remove trace particulates.
Buying a Filter?
Wondering if San Antonio tap water needs filtering? We break it down.
Baby Formula Safety
Mixing baby formula with San Antonio tap water? Read this first.
Homebuyer's Perspective
If you're house-hunting in San Antonio, water quality belongs on your due-diligence checklist alongside schools and crime data. With a score of 74/100, we recommend budgeting for high-quality point-of-entry filtration systems to protect your home's value.
Health & Family Safety
Residents should monitor Lead (90th percentile) levels. Pregnant women and families with young children should consult the specific EPA health goals listed below.
View Health Risk Glossary →Compliance Record for San Antonio
Based on EPA SDWIS violation records and contaminant test results for all water systems serving San Antonio.
Frequently Asked Questions
Is San Antonio tap water safe to drink?
Generally acceptable, but review local hotspots — score 74/100.
How many water systems serve San Antonio?
San Antonio is served by 9 public water systems in our latest EPA-backed dataset.
How can I check water quality for my exact address in San Antonio?
Use the WaterQ search tool to look up your ZIP code and view nearby systems, contaminant levels, and recent violations for San Antonio.
What is the water quality score for San Antonio?
The water quality score for San Antonio is 74 out of 100, based on EPA contaminant data, violation history, and testing results across the 9 systems serving the city.
What are the top contaminants in San Antonio?
The top contaminants detected in San Antonio include Lead (90th percentile). View detailed information on our contaminants page.
San Antonio Water Quality Summary
San Antonio, TX receives a water quality score of 74/100 (Grade C) based on EPA Safe Drinking Water Information System (SDWIS) compliance data for 9 public water systems serving the area.
San Antonio's water quality is near the national average. While most systems meet EPA standards, some violations have been recorded. Residents may wish to review their specific water system's report for contaminant details.
San Antonio's score of 74 is 2 points below the Texas state average of 76, and below the nationwide average of roughly 78/100 across all U.S. states.
Homebuyers and residents in San Antonio will find their drinking water supplied by one of several distinct systems serving this major metro area in South-central Texas. While the city's water quality achieves a generally satisfactory evaluation, the region's varied geology and proximity to the oil and gas industry can influence local water characteristics. With multiple water systems operating across the urban center, the specific water profile can vary depending on which utility serves a household.
Water quality data is sourced from the U.S. EPA SDWIS database and updated quarterly. Learn about our scoring methodology → Read our Texas water quality rankings report →
Key Contaminants
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Water Systems Serving San Antonio (9)
Southwest Texas Methodist Hospital
CSan Antonio Water System
BSouthwest Research Inst
AJbsa Sam Houston
DJbsa Randolph
CJbsa Bullis
BCity Of Alamo Heights
CThe Oaks Wsc
ASouthwest Isd Main
CCheck Your Specific Address
Water quality can vary by neighborhood in San Antonio.
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