Papaikou
EPA ID: HI0000107 · 2,203 people served · 5 ZIP codes
ZipCheckup's reading of EPA records for Papaikou (HI0000107): no drinking-water violations recorded since 2021. Papaikou is listed without violations in federal records, across a service area of 2,203 people.
Data: EPA SDWIS
Service Area Map
Coverage area for Papaikou Source: EPA SDWIS service area boundaries.
Service area boundary
Demographics of ZIP Codes Served
The ZIP codes associated with Papaikou have a median household income of $73,800 and about 55,244 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 63% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: On average, 33% of census tracts in the counties mapped to this service area are designated disadvantaged by the federal Climate and Economic Justice Screening Tool (CEJST, 2022 version). Communities with higher disadvantaged populations often face disproportionate environmental and health burdens, including aging water infrastructure and limited resources for remediation.
💧 Where Does Your Water Come From?
Papaikou's water is classified in EPA records as a groundwater source. 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.
Infrastructure Risk
Comparable Water Systems
Similar-sized systems in Hawaii
System Overview
Papaikou (EPA ID: HI0000107) is a community water system in Hawaii that serves approximately 2,203 people from groundwater sources.
This system provides water to 5 ZIP codes across 5 communities.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| Below the reporting limit | No | 2023-12-31 |
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
5 of 5 ZIP records with known zones are in EPA Radon Zone 3.
The EPA recommends testing all homes regardless of radon zone. County radon zones cannot replace an in-home radon test.
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 available EPA compliance records for Papaikou (HI0000107) on EPA.gov.
Frequently Asked Questions
Is Papaikou water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Papaikou 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 Papaikou serve?
Papaikou serves approximately 2,203 people across 5 ZIP codes in Hawaii.
Where does Papaikou get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Papaikou Water Quality Report, HI. https://zipcheckup.com/water-system/hi0000107/
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author = {{ZipCheckup}},
title = {{Papaikou Water Quality Report, HI}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/hi0000107/}
}