Wailuku
Is Wailuku tap water safe to drink?
Use extra caution — Wailuku scores 39/100. This report aggregates EPA drinking water data across 8 local systems in Wailuku. We found 1282 total violations (922 unresolved).
Real-Time Environment
Live: 04:15 PM☀️ No active precipitation. Rainfall can impact surface water turbidity and pollutant runoff in Wailuku.
Water Quality Impact
🛡️ Home Water Treatment Needs
Should you invest in filtration or softening for your home in Wailuku?
Expert Advice
Given the safety margin, a Carbon Block or sediment filter is recommended to improve taste and remove trace particulates.
Buying a Filter?
Wondering if Wailuku tap water needs filtering? We break it down.
Baby Formula Safety
Mixing baby formula with Wailuku tap water? Read this first.
Homebuyer's Perspective
If you're house-hunting in Wailuku, water quality belongs on your due-diligence checklist alongside schools and crime data. With a score of 39/100, 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 Wailuku
Based on EPA SDWIS violation records and contaminant test results for all water systems serving Wailuku.
Frequently Asked Questions
Is Wailuku tap water safe to drink?
Use extra caution — Wailuku scores 39/100.
How many water systems serve Wailuku?
Wailuku is served by 8 public water systems in our latest EPA-backed dataset.
How can I check water quality for my exact address in Wailuku?
Use the WaterQ search tool to look up your ZIP code and view nearby systems, contaminant levels, and recent violations for Wailuku.
What is the water quality score for Wailuku?
The water quality score for Wailuku is 39 out of 100, based on EPA contaminant data, violation history, and testing results across the 8 systems serving the city.
What are the top contaminants in Wailuku?
The top contaminants detected in Wailuku include Lead (90th percentile). View detailed information on our contaminants page.
Wailuku Water Quality Summary
Wailuku, HI receives a water quality score of 39/100 (Grade F) based on EPA Safe Drinking Water Information System (SDWIS) compliance data for 8 public water systems serving the area.
Wailuku's water quality score is below the national average, indicating a history of EPA violations or elevated contaminant levels. Residents are encouraged to check their specific water system report and consider additional filtration.
Wailuku's score of 39 is 40 points below the Hawaii state average of 79, and below the nationwide average of roughly 78/100 across all U.S. states.
In this mid-size Hawaiian city, residents and prospective homebuyers face significant drinking water challenges that require proactive attention. Wailuku’s eight water systems must navigate the unique geological pressures of a volcanic Pacific island alongside the demands of tourism-dependent infrastructure. Because the overall quality assessments for the area's supply indicate severe deficiencies, households here may want to implement filtration or alternative sourcing for their daily usage.
Water quality data is sourced from the U.S. EPA SDWIS database and updated quarterly. Learn about our scoring methodology → Read our Hawaii water quality rankings report →
Key Contaminants
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Water Systems Serving Wailuku (8)
Upper Kula
DHana
FUalapue
FKaunakakai
FLower Kula
AWailuku
BMakawao
FLahaina
FCheck Your Specific Address
Water quality can vary by neighborhood in Wailuku.
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Compare Wailuku water quality: View all states · Contaminant library · How we score water quality