Kahuku
EPA ID: HI0000365 · 2,730 people served · 2 ZIP codes
ZipCheckup's reading of EPA SDWIS for Kahuku (HI0000365): no EPA violations recorded in the last five years. Zero violations in five consecutive years of EPA monitoring - Kahuku has held a clean track record across every reporting cycle in that span, with no enforcement activity of any kind on file for the full service population of 2,730 residents.
Data: EPA SDWIS
Service Area Map
Coverage area for Kahuku Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Kahuku serves a community with a median household income of $85,582 and an estimated 10,926 residents across its service area. Approximately 77% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Kahuku's water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
Superfund Proximity Note: This service area ranks in the 60th percentile nationally for proximity to Superfund (NPL) sites. Groundwater sources near contaminated sites may face elevated risk from industrial chemicals.
Infrastructure Risk
Comparable Water Systems
Similar-sized systems in Hawaii
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
Kahuku (EPA ID: HI0000365) is a community water system in Hawaii that serves approximately 2,730 people from groundwater sources.
This system provides water to 2 ZIP codes across 2 communities.
Violation History
Lead & Copper
No reported lead measurement appears for this PWSID in the accepted LCR snapshot. Absence of a reported measurement is not a measured zero.
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 3 (Low Risk)
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by HI or modeled from parcel and building-footprint data.
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Kahuku (HI0000365) on EPA.gov.
Frequently Asked Questions
Is Kahuku water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Kahuku in the inclusive 2021-2026 record-year window. This is a compliance-record finding, not a guarantee about water at a specific tap.
How many people does Kahuku serve?
Kahuku serves approximately 2,730 people across 2 ZIP codes in Hawaii.
Where does Kahuku get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Kahuku Water Quality Report, HI. https://zipcheckup.com/water-system/hi0000365/
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author = {{ZipCheckup}},
title = {{Kahuku Water Quality Report, HI}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/hi0000365/}
}