Modesto
Is Modesto tap water safe to drink?
Mostly yes — Modesto scores 98/100. This report aggregates EPA drinking water data across 5 local systems in Modesto. We found 58 total violations (3 unresolved).
Real-Time Environment
Live: 07:15 PM☀️ No active precipitation. Rainfall can impact surface water turbidity and pollutant runoff in Modesto.
Water Quality Impact
🛡️ Home Water Treatment Needs
Should you invest in filtration or softening for your home in Modesto?
Expert Advice
Your water quality is excellent. Standard filtration is optional but can further enhance taste.
Buying a Filter?
Filter or no filter for Modesto water? Here's what the data says.
Baby Formula Safety
What new parents in Modesto should know about tap water safety.
Homebuyer's Perspective
Water quality is easy to overlook when evaluating a move to Modesto, but it can affect plumbing longevity and appliance lifespan. The high safety score (98/100) 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 Modesto
Based on EPA SDWIS violation records and contaminant test results for all water systems serving Modesto.
Frequently Asked Questions
Is Modesto tap water safe to drink?
Mostly yes — Modesto scores 98/100.
How many water systems serve Modesto?
Modesto is served by 5 public water systems in our latest EPA-backed dataset.
How can I check water quality for my exact address in Modesto?
Use the WaterQ search tool to look up your ZIP code and view nearby systems, contaminant levels, and recent violations for Modesto.
What is the water quality score for Modesto?
The water quality score for Modesto is 98 out of 100, based on EPA contaminant data, violation history, and testing results across the 5 systems serving the city.
What are the top contaminants in Modesto?
The top contaminants detected in Modesto include Lead (90th percentile). View detailed information on our contaminants page.
Modesto Water Quality Summary
Modesto, CA receives a water quality score of 98/100 (Grade A) based on EPA Safe Drinking Water Information System (SDWIS) compliance data for 5 public water systems serving the area.
Modesto'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.
Modesto's score of 98 is 9 points above the California state average of 89, and above the nationwide average of roughly 78/100 across all U.S. states.
Prospective homebuyers looking at this mid-size California city can feel confident about the local tap water quality, which consistently receives top-tier marks across its various distribution systems. For residents in the Central Valley, these high ratings provide peace of mind despite a regional context of varied geology and intensive agricultural and urban activity on the West Coast. This robust performance shows that Modesto successfully manages its water resources to deliver clean, reliable drinking water throughout the community.
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 Modesto (5)
City Of Modesto - Salida
ACity Of Modesto - South Turlock
ACity Of Modesto - Del Rio
AModesto, City Of
AGregori High School
ACheck Your Specific Address
Water quality can vary by neighborhood in Modesto.
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Quick compare in California
Compare Modesto water quality: View all states · Contaminant library · How we score water quality