- EPA's UCMR 5 testing looked for 30 contaminants here and found 1.
- PFHxS (a PFAS): found in 1 of 92 samples, average 0.0 ppt, highest 3 ppt (EPA UCMR 5 testing, May 2023–Dec 2025)
Public EPA test results
Can you drink Honolulu tap water? What EPA records show
EPA HI0000331 · serves Honolulu-Windward-Pearlharbor, HI · about 631,389 people (EPA SDWIS)
This report shows EPA's federal records for this water system: UCMR 5 testing, lead testing and violations. It isn't a test of the water at your tap, and it has no Water Score.
Public EPA test results
HNL-Windward-Pearl Harbor (EPA HI0000331)
EPA data as of October 14, 2026. For Honolulu's main utility, HNL-Windward-Pearl Harbor: We found no health-based violations in EPA's records for this system (HI0000331) since July 1, 2021, as of October 14, 2026. PFOA and PFOS were not detected at or above EPA's reporting level in EPA's UCMR 5 testing.
What EPA records show for HNL-Windward-Pearl Harbor, as of October 14, 2026
We found no health-based violations in EPA's records for this system (HI0000331) since July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for HNL-Windward-Pearl Harbor (SDWIS). Data as of October 14, 2026.
We found no lead 90th-percentile result in EPA's records for this system (HI0000331) for a monitoring period that ran on or after July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for HNL-Windward-Pearl Harbor (SDWIS). Data as of October 14, 2026.
EPA's UCMR 5 testing looked for 30 contaminants here and found 1.
PFOA and PFOS were not detected at or above EPA's reporting level in EPA's UCMR 5 testing.
Source: EPA records (SDWIS, UCMR 5). SDWIS: data as of Oct 14, 2026. EPA UCMR 5 data, samples through June 2026.
Your water bill names your utility.
Does HNL-Windward-Pearl Harbor use chloramine?
We didn't find chloramine in HNL-Windward-Pearl Harbor's EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.