Honolulu
Is Honolulu tap water safe to drink?
Mostly yes — Honolulu scores 88/100. This report aggregates EPA drinking water data across 1 local system in Honolulu. We found 0 total violations (0 unresolved).
Real-Time Environment
Live: 03:30 PM☀️ No active precipitation. Rainfall can impact surface water turbidity and pollutant runoff in Honolulu.
Water Quality Impact
🛡️ Home Water Treatment Needs
Should you invest in filtration or softening for your home in Honolulu?
Expert Advice
Your water quality is excellent. Standard filtration is optional but can further enhance taste.
Buying a Filter?
Filter or no filter for Honolulu water? Here's what the data says.
Baby Formula Safety
What new parents in Honolulu should know about tap water safety.
Homebuyer's Perspective
Water quality is easy to overlook when evaluating a move to Honolulu, but it can affect plumbing longevity and appliance lifespan. The high safety score (88/100) suggests lower risk for plumbing corrosion and appliance scaling.
Health & Family Safety
Residents should monitor Tetrachloroethylene (PCE) levels. Pregnant women and families with young children should consult the specific EPA health goals listed below.
View Health Risk Glossary →Compliance Record for Honolulu
Based on EPA SDWIS violation records and contaminant test results for all water systems serving Honolulu.
Frequently Asked Questions
Is Honolulu tap water safe to drink?
Mostly yes — Honolulu scores 88/100.
How many water systems serve Honolulu?
Honolulu is served by 1 public water system in our latest EPA-backed dataset.
How can I check water quality for my exact address in Honolulu?
Use the WaterQ search tool to look up your ZIP code and view nearby systems, contaminant levels, and recent violations for Honolulu.
What is the water quality score for Honolulu?
The water quality score for Honolulu is 88 out of 100, based on EPA contaminant data, violation history, and testing results for all serving water systems.
What are the top contaminants in Honolulu?
The top contaminants detected in Honolulu include Tetrachloroethylene (PCE), Chloramine, Gross Alpha Particle Activity. View detailed information on our contaminants page.
Honolulu Water Quality Summary
Honolulu, HI receives a water quality score of 88/100 (Grade B) based on EPA Safe Drinking Water Information System (SDWIS) compliance data for 14 public water systems serving the area.
Honolulu'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.
Honolulu's score of 88 is 10 points above the Hawaii state average of 78, and above the nationwide average of roughly 78/100 across all U.S. states.
For residents and prospective homebuyers establishing themselves in Honolulu, the water supply across this large city is managed by fourteen individual water systems. Operating within a Pacific island setting characterized by volcanic geology, these networks deliver a quality that is solid and comfortably above average. Even with the unique demands placed on Hawaii's tourism-dependent infrastructure, the local tap water remains dependable, though the island geography makes staying informed a smart habit.
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 Honolulu (1)
Check Your Specific Address
Water quality can vary by neighborhood in Honolulu.
Related
Quick compare in Hawaii
Compare Honolulu water quality: View all states · Contaminant library · How we score water quality