San Jose
Is San Jose tap water safe to drink?
Mostly yes — San Jose scores 96/100. This report aggregates EPA drinking water data across 1 local system in San Jose. We found 0 total violations (0 unresolved).
Real-Time Environment
Live: 03:30 PM☀️ No active precipitation. Rainfall can impact surface water turbidity and pollutant runoff in San Jose.
Water Quality Impact
🛡️ Home Water Treatment Needs
Should you invest in filtration or softening for your home in San Jose?
Expert Advice
Your water quality is excellent. Standard filtration is optional but can further enhance taste.
Buying a Filter?
Wondering if San Jose tap water needs filtering? We break it down.
Baby Formula Safety
Mixing baby formula with San Jose tap water? Read this first.
Homebuyer's Perspective
If you're house-hunting in San Jose, water quality belongs on your due-diligence checklist alongside schools and crime data. The high safety score (96/100) suggests lower risk for plumbing corrosion and appliance scaling.
Health & Family Safety
Residents should monitor Nitrate 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 Jose
Based on EPA SDWIS violation records and contaminant test results for all water systems serving San Jose.
Frequently Asked Questions
Is San Jose tap water safe to drink?
Mostly yes — San Jose scores 96/100.
How many water systems serve San Jose?
San Jose is served by 1 public water system in our latest EPA-backed dataset.
How can I check water quality for my exact address in San Jose?
Use the WaterQ search tool to look up your ZIP code and view nearby systems, contaminant levels, and recent violations for San Jose.
What is the water quality score for San Jose?
The water quality score for San Jose is 96 out of 100, based on EPA contaminant data, violation history, and testing results for all serving water systems.
What are the top contaminants in San Jose?
The top contaminants detected in San Jose include Nitrate, Turbidity, PFAS (Per- and Polyfluoroalkyl Substances). View detailed information on our contaminants page.
San Jose Water Quality Summary
San Jose, CA receives a water quality score of 96/100 (Grade A) based on EPA Safe Drinking Water Information System (SDWIS) compliance data for 44 public water systems serving the area.
San Jose's water quality is above the national average, with strong compliance records and low contaminant levels. Residents generally receive clean, safe tap water that meets EPA standards.
San Jose's score of 96 is 6 points above the California state average of 90, and above the nationwide average of roughly 78/100 across all U.S. states.
For residents and homebuyers in this major metro area, San Jose's drinking water consistently achieves excellent ratings that reflect a strong standard of safety. Because the city lies in a West Coast region characterized by varied geology, large urban centers, and nearby Central Valley agriculture, local water quality is managed through dozens of distinct water systems. This multi-system setup helps buffer the community against regional environmental and geological variations, providing peace of mind and highly rated tap water across the metropolitan expanse of California.
Water quality data is sourced from the U.S. EPA SDWIS database and updated quarterly. Learn about our scoring methodology → Read our California water quality rankings report →
Key Contaminants
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Water Systems Serving San Jose (1)
Check Your Specific Address
Water quality can vary by neighborhood in San Jose.
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