Hoku'ula Water System
EPA ID: HI0000267 · 1,000 people served · 1 ZIP code
Across every monitored period in the past five years, Hoku'ula Water System reported no EPA violations for its service population of 1,000.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Demographics
The Hoku'ula Water System serves a community with a median household income of $105,942 and an estimated 18,782 residents across its service area. Approximately 56% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Hoku'ula Water System'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.
About 2% of homes in Honolulu County, Hawaii rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
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
Hoku'ula Water System (EPA ID: HI0000267) is a community water system in Hawaii that serves approximately 1,000 people from groundwater sources.
This system serves ZIP code 96768 in Makawao.
Violation History
Lead & Copper
No Lead and Copper Rule sampling data available for this water system.
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
- 96768 — Makawao
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Hoku'ula Water System (HI0000267) on EPA.gov.
Frequently Asked Questions
Is Hoku'ula Water System water safe to drink?
Based on EPA records, Hoku'ula Water System has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Hoku'ula Water System serve?
Hoku'ula Water System serves approximately 1,000 people across 1 ZIP code in Hawaii.
Where does Hoku'ula Water System get its water?
The primary water source is groundwater.