Williston
Is Williston tap water safe to drink?
Mostly yes — Williston scores 89/100. This report aggregates EPA drinking water data across 2 local systems in Williston. We found 68 total violations (25 unresolved).
Real-Time Environment
Live: 04:15 PM☀️ No active precipitation. Rainfall can impact surface water turbidity and pollutant runoff in Williston.
Water Quality Impact
🛡️ Home Water Treatment Needs
Should you invest in filtration or softening for your home in Williston?
Expert Advice
Your water quality is excellent. Standard filtration is optional but can further enhance taste.
Buying a Filter?
Filter or no filter for Williston water? Here's what the data says.
Baby Formula Safety
What new parents in Williston should know about tap water safety.
Homebuyer's Perspective
Water quality is easy to overlook when evaluating a move to Williston, but it can affect plumbing longevity and appliance lifespan. The high safety score (89/100) 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 Williston
Based on EPA SDWIS violation records and contaminant test results for all water systems serving Williston.
Frequently Asked Questions
Is Williston tap water safe to drink?
Mostly yes — Williston scores 89/100.
How many water systems serve Williston?
Williston is served by 2 public water systems in our latest EPA-backed dataset.
How can I check water quality for my exact address in Williston?
Use the WaterQ search tool to look up your ZIP code and view nearby systems, contaminant levels, and recent violations for Williston.
What is the water quality score for Williston?
The water quality score for Williston is 89 out of 100, based on EPA contaminant data, violation history, and testing results across the 2 systems serving the city.
What are the top contaminants in Williston?
The top contaminants detected in Williston include Lead (90th percentile). View detailed information on our contaminants page.
Williston Water Quality Summary
Williston, ND receives a water quality score of 89/100 (Grade B) based on EPA Safe Drinking Water Information System (SDWIS) compliance data for 2 public water systems serving the area.
Williston'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.
Williston's score of 89 is 3 points below the North Dakota state average of 92, 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 North Dakota water quality rankings report →
Key Contaminants
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Water Systems Serving Williston (2)
Check Your Specific Address
Water quality can vary by neighborhood in Williston.
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