Is Hilo tap water safe to drink?

Yes with good quality

Hilo'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
1.8 GPG
Hardness
Not detected
PFAS

1 Issue Detected in Hilo

Arsenic Approaching Limit (0.1 mg/L)

EPA limit is 0.010 mg/L.

Arsenic info for Hilo
Hawaii

9,672,096,721 · Surface water and groundwater

Is Hilo Tap Water Safe? Full Analysis

Low Risk Updated March 2026 45,703 residents
See Best Filters for Hilo
85
Purity Score

Water quality in Hilo, Hawaii is evaluated here using public utility data and independent testing. The report includes a purity score, contaminant breakdown, and tailored filter recommendations.

Contaminant Levels

PFAS
ND
Lead
1 ppb
Nitrate
0.2 mg/L
Arsenic
0.1 mg/L
Hardness
1.8 gpg

Health Insights

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

Score

85 /100
Excellent
"Good" threshold (70)

Hilo tap water is sourced from Surface water and groundwater and treated by County of Hawaii Department of Water Supply. Overall purity score: 85/100 (Excellent). Updated for 2026.

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Best filters matched to Hilo's 1 issue.

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Explore Hilo Water Data

Forever Chemicals in HiloPFAS water report
Lead Risk in HiloLead water report
Hilo Hardness ReportScale and minerals
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HawaiiState rankings

Hilo Water FAQ

Is Hilo HI tap water safe to drink in 2026?
Hilo 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 Hilo HI use chlorine or chloramine for disinfection?
Hilo uses chlorine as the primary disinfectant with a residual level of 0.6 ppm. Standard activated carbon filters including pitcher filters are effective at removing free chlorine taste and odor.
How hard is Hilo HI water and what is the TDS level?
Hilo water hardness is 1.8 grains per gallon (soft) with a TDS of 55 ppm (good). This level is unlikely to cause significant scale buildup in household plumbing.
Has PFAS been found in Hilo HI drinking water?
Based on available EPA UCMR5 monitoring data as of 2026 PFAS have not been detected above EPA advisory levels in Hilo drinking water.
What is the best water filter for Hilo?
Based on Hilo's water profile, we recommend the Clearly Filtered Water Pitcher. Hilo water scores well overall. A pitcher filter provides extra precaution and improves taste for drinking and cooking.

Nearby Reports

HonoluluHawaii — 85/100Pearl CityHawaii — 85/100KailuaHawaii — 85/100

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Data Sources

  • EPA SDWIS
  • EWG Tap Water Database
  • County of Hawaii Department of Water Supply CCR
  • USGS monitoring data

PurityMap compiles public data. Updated March 2026.

© 2026 PurityMap. For informational purposes only.

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