Walnut
Is Walnut tap water safe to drink?
Mostly yes — Walnut scores 94/100. This report aggregates EPA drinking water data across 1 local system in Walnut. We found 5 total violations (3 unresolved).
Real-Time Environment
Live: 07:30 PM☀️ No active precipitation. Rainfall can impact surface water turbidity and pollutant runoff in Walnut.
Water Quality Impact
🛡️ Home Water Treatment Needs
Should you invest in filtration or softening for your home in Walnut?
Expert Advice
Your water quality is excellent. Standard filtration is optional but can further enhance taste.
Buying a Filter?
Wondering if Walnut tap water needs filtering? We break it down.
Baby Formula Safety
Mixing baby formula with Walnut tap water? Read this first.
Homebuyer's Perspective
If you're house-hunting in Walnut, water quality belongs on your due-diligence checklist alongside schools and crime data. The high safety score (94/100) 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 Walnut
Based on EPA SDWIS violation records and contaminant test results for all water systems serving Walnut.
Frequently Asked Questions
Is Walnut tap water safe to drink?
Mostly yes — Walnut scores 94/100.
How many water systems serve Walnut?
Walnut is served by 1 public water system in our latest EPA-backed dataset.
How can I check water quality for my exact address in Walnut?
Use the WaterQ search tool to look up your ZIP code and view nearby systems, contaminant levels, and recent violations for Walnut.
What is the water quality score for Walnut?
The water quality score for Walnut is 94 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 Walnut?
The top contaminants detected in Walnut include Lead (90th percentile). View detailed information on our contaminants page.
Walnut Water Quality Summary
Walnut, CA receives a water quality score of 94/100 (Grade A) based on EPA Safe Drinking Water Information System (SDWIS) compliance data for 1 public water system serving the area.
Walnut'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.
Walnut's score of 94 is 5 points above the California state average of 89, and above the nationwide average of roughly 78/100 across all U.S. states.
Homebuyers and residents in this mid-size California city can rely on a unified water system that delivers highly rated drinking water. This local supply is managed within a West Coast region defined by varied geology, large urban centers, and Central Valley agriculture. Through this centralized infrastructure, the municipality consistently maintains a stellar rating for its water quality.
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 Walnut (1)
Check Your Specific Address
Water quality can vary by neighborhood in Walnut.
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