Foster City
Is Foster City tap water safe to drink?
Mostly yes — Foster City scores 100/100. This report aggregates EPA drinking water data across 1 local system in Foster City. We found 7 total violations (1 unresolved).
Real-Time Environment
Live: 12:30 PM☀️ No active precipitation. Rainfall can impact surface water turbidity and pollutant runoff in Foster City.
Water Quality Impact
🛡️ Home Water Treatment Needs
Should you invest in filtration or softening for your home in Foster City?
Expert Advice
Your water quality is excellent. Standard filtration is optional but can further enhance taste.
Buying a Filter?
Filtration technologies matched to Foster City contaminant records.
Baby Formula Safety
Guidance on preparing infant formula using municipal tap water in Foster City.
Homebuyer's Perspective
Municipal water quality in Foster City directly influences pipe corrosion rates and home filtration needs. The high safety score (100/100) suggests lower risk for plumbing corrosion and appliance scaling.
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 Foster City
Based on EPA SDWIS violation records and contaminant test results for all water systems serving Foster City.
Frequently Asked Questions
Is Foster City tap water safe to drink?
Mostly yes — Foster City scores 100/100.
How many water systems serve Foster City?
Foster City is served by 1 public water system in our latest EPA-backed dataset.
How can I check water quality for my exact address in Foster City?
Use the WaterQ search tool to look up your ZIP code and view nearby systems, contaminant levels, and recent violations for Foster City.
What is the water quality score for Foster City?
The water quality score for Foster City is 100 out of 100, based on EPA contaminant data, violation history, and testing results across the 1 system serving the city.
What are the top contaminants in Foster City?
The top contaminants detected in Foster City include Lead (90th percentile). View detailed information on our contaminants page.
Foster City Water Quality Summary
Foster City, CA receives a water quality score of 100/100 (Grade A) based on EPA Safe Drinking Water Information System (SDWIS) compliance data for 1 public water system serving the area.
Foster City'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.
Foster City's score of 100 is 11 points above the California state average of 89, and above the nationwide average of roughly 78/100 across all U.S. states.
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 Foster City (1)
Check Your Specific Address
Water quality can vary by neighborhood in Foster City.
Related
Quick compare in California
Compare Foster City water quality: View all states · Contaminant library · How we score water quality