East Kapolei
HI · CDP

Is East Kapolei, HI Tap Water Safe to Drink?

East Kapolei tap water meets federal Safe Drinking Water Act standards but 1 of 1 ZIP code show detections above EPA health guidelines, primarily for PFTrDA. A certified filter is recommended for households that want an additional layer of protection.

2Water systems
1ZIP codes
100%ZIPs above EPA guideline
Metro areaUrban Honolulu, HI
Latest data2025-05-05

Where Does East Kapolei Get Its Water?

Water in East Kapolei, HI is provided by 2 public water systems: KOHALA RANCH WATER CO. and WAIPAHU-EWA-WAIANAE.

How Is East Kapolei Tap Water Treated?

Treated water is disinfected using free chlorine. Treatment includes granular activated carbon filtration and groundwater disinfection.

What's in East Kapolei Tap Water?

The following contaminants were detected most frequently in East Kapolei public water systems. 1 of 1 ZIP codes showed detections above EPA health guidelines.

ContaminantPeak detectedEPA guidelineZIPs detectedStatus
PFTrDA 0.007 µg/L 0.007 µg/L 1 ZIP Above guideline
lithium 9 µg/L — 0 ZIPs Within guideline
11Cl-PF3OUdS 0.005 µg/L — 0 ZIPs Within guideline
HFPO-DA 0.005 µg/L — 0 ZIPs Within guideline
PFBA 0.005 µg/L — 0 ZIPs Within guideline

Health Risk Profile for East Kapolei

Based on EPA monitoring data, 1 of 1 ZIP codes in East Kapolei have recorded detections above EPA health guidelines. Sensitive populations such as infants, pregnant individuals, and those with weakened immune systems may benefit from an additional layer of protection such as a certified point-of-use filter.

Best Broad-Spectrum Filters for This Water Profile

This city profile includes PFAS detections, chlorine disinfection, and other dissolved contaminants. Reverse osmosis (RO) systems certified under NSF/ANSI 58 provide broad reduction coverage; for PFAS specifically, confirm NSF/ANSI P473 or equivalent PFAS reduction certification.

Waterdrop G3P600 Reverse Osmosis System
Under-sink RO system

8-stage tankless RO system certified to NSF/ANSI 58, reduces 1,000+ contaminants including PFAS, lead, arsenic, fluoride, and nitrates.

See recommendations matched to your exact address: choose your ZIP code below.

Frequently Asked Questions about East Kapolei Tap Water

Is East Kapolei tap water safe to drink?

East Kapolei tap water meets Safe Drinking Water Act requirements but 1 of 1 ZIP codes show contaminant levels above EPA health-based guidelines. A certified point-of-use filter adds an extra layer of protection.

What contaminants are in East Kapolei tap water?

The most commonly detected contaminants in East Kapolei water systems include: PFTrDA, lithium, 11Cl-PF3OUdS. See the ZIP-level reports for exact measurements and EPA guideline comparisons.

Where does East Kapolei get its drinking water?

East Kapolei receives water from 2 public water systems, including KOHALA RANCH WATER CO..

Do I need a water filter in East Kapolei?

If your ZIP code is among those with detections above EPA health guidelines, choose a filter certified for the specific contaminants shown in your ZIP report. Reverse osmosis is generally the broadest option for PFAS, lithium, and many other dissolved contaminants.

How often is East Kapolei tap water tested?

Public water systems in East Kapolei are required by the EPA to test for regulated contaminants on schedules ranging from daily (for microbials and disinfectants) to annual or triennial (for many chemical contaminants). Results are published in annual Consumer Confidence Reports (CCRs). The data on this page reflects the most recent available EPA monitoring results, with the latest sample date of 2025-05-05.

Tap water reports by ZIP in East Kapolei

Water utilities serving East Kapolei, HI

Service area boundaries are approximate and based on state filings or modeled estimates. Contact your utility to confirm exact service at a specific address.

Modeled boundaries are shown with a dashed outline. Outlines appear when service-area boundary data is available for this ZIP.

Also covers / overlaps with