Water Quality in Honolulu, HI
Detailed water quality data for Honolulu, Hawaii including contaminant levels, EPA comparisons, AquaScore™ grading, and treatment recommendations.
Water utility: Honolulu Board of Water Supply.
Water source: Basal aquifers (volcanic rock groundwater).
Key Contaminants Found
- Total trihalomethanes (TTHMs)
- Haloacetic acids (HAA5)
- Chloroform
- Lead
- Copper
Honolulu's water comes from volcanic rock aquifers naturally filtered through basalt. Water quality is above average, but the Red Hill fuel storage facility leak in 2021 contaminated wells serving 93,000 people with jet fuel compounds.