Is Honolulu tap water safe to drink?

Yes with good quality

Honolulu's tap water meets all EPA standards and scores well on our analysis. It is generally safe to drink though filtration can improve taste and provide extra precaution.

85/100
Purity Score
1
Issues Found
3.5 GPG
Hardness
Not detected
PFAS

1 Issue Detected in Honolulu

Arsenic Approaching Limit (0.1 mg/L)

EPA limit is 0.010 mg/L.

Arsenic info for Honolulu
Hawaii

968,019,681,396,814 · Groundwater and surface water

Honolulu Water Safety and Contaminant Report

Low Risk Updated March 2026 350,964 residents
See Best Filters for Honolulu
85
Purity Score

Honolulu's drinking water is sourced from Groundwater and surface water and treated by Honolulu Board of Water Supply. This analysis covers PFAS testing, hardness, chlorine levels, lead risk, and overall safety.

Contaminant Levels

PFAS
ND
Lead
1.5 ppb
Nitrate
0.3 mg/L
Arsenic
0.1 mg/L
Hardness
3.5 gpg

Health Insights

  • 1
    Honolulu's water meets current EPA standards. Filtration can improve taste and provide extra safety.

Score

85 /100
Excellent
"Good" threshold (70)

Honolulu tap water is sourced from Groundwater and surface water and treated by Honolulu Board of Water Supply. Overall purity score: 85/100 (Excellent). Updated for 2026.

Fix Your Water

Best filters matched to Honolulu's 1 issue.

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Explore Honolulu Water Data

Forever Chemicals in HonoluluPFAS water report
Lead Risk in HonoluluLead water report
Honolulu Hardness ReportScale and minerals
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Honolulu Water FAQ

Is Honolulu HI tap water safe to drink in 2026?
Honolulu tap water meets EPA federal drinking water standards and scores 85/100 (Excellent) on PurityMap for 2026. For most healthy adults the water is considered safe but point-of-use filtration adds an important layer of protection.
Does Honolulu HI use chlorine or chloramine for disinfection?
Honolulu uses chloramine as the primary disinfectant with a residual level of 0.8 ppm. Chloramine is harder to remove than free chlorine and requires a catalytic carbon or reverse osmosis filter. Standard Brita-style pitchers will NOT remove chloramine.
How hard is Honolulu HI water and what is the TDS level?
Honolulu water hardness is 3.5 grains per gallon (soft) with a TDS of 150 ppm (good). This level is unlikely to cause significant scale buildup in household plumbing.
Has PFAS been found in Honolulu HI drinking water?
Based on available EPA UCMR5 monitoring data as of 2026 PFAS have not been detected above EPA advisory levels in Honolulu drinking water.
What is the best water filter for Honolulu?
Based on Honolulu's water profile, we recommend the Clearly Filtered Water Pitcher. Honolulu water scores well overall. A pitcher filter provides extra precaution and improves taste for drinking and cooking.

Nearby Reports

Pearl CityHawaii — 85/100HiloHawaii — 85/100KailuaHawaii — 85/100

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Data Sources

  • EPA SDWIS
  • EWG Tap Water Database
  • Honolulu Board of Water Supply CCR
  • USGS monitoring data

PurityMap compiles public data. Updated March 2026.

© 2026 PurityMap. For informational purposes only.

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