Lewiston
Is Lewiston tap water safe to drink?
Generally acceptable, but review local hotspots — score 73/100. This report aggregates EPA drinking water data across 3 local systems in Lewiston. We found 263 total violations (259 unresolved).
Real-Time Environment
Live: 11:00 AM☀️ No active precipitation. Rainfall can impact surface water turbidity and pollutant runoff in Lewiston.
Water Quality Impact
🛡️ Home Water Treatment Needs
Should you invest in filtration or softening for your home in Lewiston?
Expert Advice
Given the safety margin, a Carbon Block or sediment filter is recommended to improve taste and remove trace particulates.
Buying a Filter?
Evaluation of municipal compliance and household filtration options in Lewiston.
Baby Formula Safety
EPA compliance thresholds and pediatric water precautions for Lewiston.
Homebuyer's Perspective
Water system history in Lewiston informs property maintenance and private filtration requirements. With a score of 73/100, 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 Lewiston
Based on EPA SDWIS violation records and contaminant test results for all water systems serving Lewiston.
Frequently Asked Questions
Is Lewiston tap water safe to drink?
Generally acceptable, but review local hotspots — score 73/100.
How many water systems serve Lewiston?
Lewiston is served by 3 public water systems in our latest EPA-backed dataset.
How can I check water quality for my exact address in Lewiston?
Use the WaterQ search tool to look up your ZIP code and view nearby systems, contaminant levels, and recent violations for Lewiston.
What is the water quality score for Lewiston?
The water quality score for Lewiston is 73 out of 100, based on EPA contaminant data, violation history, and testing results across the 3 systems serving the city.
What are the top contaminants in Lewiston?
The top contaminants detected in Lewiston include Lead (90th percentile). View detailed information on our contaminants page.
Lewiston Water Quality Summary
Lewiston, ID receives a water quality score of 73/100 (Grade C) based on EPA Safe Drinking Water Information System (SDWIS) compliance data for 3 public water systems serving the area.
Lewiston'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.
Lewiston's score of 73 is 7 points below the Idaho state average of 80, and below 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 Idaho water quality rankings report →
Key Contaminants
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Water Systems Serving Lewiston (3)
Check Your Specific Address
Water quality can vary by neighborhood in Lewiston.
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Compare Lewiston water quality: View all states · Contaminant library · How we score water quality