- EPA's UCMR 5 testing looked for 30 contaminants here and found 1.
- PFPeA (a PFAS): found in 1 of 34 samples, average 0.10 ppt, highest 3.3 ppt (EPA UCMR 5 testing, Mar 2023–Nov 2023)
Public EPA test results
Can you drink Waipahu tap water? What EPA records show
EPA system ID HI0000335 · serves Waipahu-Ewa-Waianae, HI · about 217,479 people (EPA records)
Here's what EPA has on file for this water system: its testing for newer contaminants like PFAS (UCMR 5), lead testing and violations. It's not a test of your tap, and there's no Water Score here.
Public EPA test results
Waipahu-Ewa-Waianae (EPA HI0000335)
EPA data as of October 14, 2026. For Waipahu's main utility, Waipahu-Ewa-Waianae: We found no health-standard violations in EPA's records for this system (HI0000335) 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. This is public data, not a test of your tap.
What EPA records show for Waipahu-Ewa-Waianae, as of October 14, 2026
We found no health-standard violations in EPA's records for this system (HI0000335) since July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for Waipahu-Ewa-Waianae (SDWIS). Data as of October 14, 2026.
We found no lead 90th-percentile result in EPA's records for this system (HI0000335) for a monitoring period that ran on or after July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for Waipahu-Ewa-Waianae (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 Waipahu-Ewa-Waianae use chloramine?
We didn't find chloramine in Waipahu-Ewa-Waianae's EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.