Hnl-windward-pearl Harbor
EPA ID: HI0000331 · 631,389 people served · 51 ZIP codes
Compliance tracking for Hnl-windward-pearl Harbor shows 1 pending violation logged in the EPA system — the supplier delivers water to approximately 631,389 residents while those findings remain open.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Hnl-windward-pearl Harbor Source: EPA SDWIS service area boundaries.
Service area boundary — Grade B
Service Area Demographics
The Hnl-windward-pearl Harbor serves a community with a median household income of $104,779 and an estimated 691,154 residents across its service area. Approximately 74% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Hnl-windward-pearl Harbor'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
Detected Contaminants
How Hnl-windward-pearl Harbor compares to EPA limits
What This Means For You
Stage 1 DBP Rule at 2 mg/L exceeds the EPA maximum of mg/L.
Surface Water Treatment Rule at 1 mg/L exceeds the EPA maximum of mg/L.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 17 detections recorded.
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
HNL-WINDWARD-PEARL HARBOR (EPA ID: HI0000331) is a community water system in Hawaii that serves approximately 631,389 people from groundwater sources.
This system provides water to 51 ZIP codes across 11 communities.
Average Home Safety Score: B (83/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Stage 1 DBP Rule | Treatment Failure | 2 | No |
| Surface Water Treatment Rule | Treatment Failure | 1 | No |
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 96744 | 0.005094 mg/L | No | N/A |
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: 21 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 30 additional ZIPs inferred from SDWIS registry data. The EPA-confirmed set is the most reliable; SDWIS-inferred entries may be narrower than the real deployment area.
This system serves 51 ZIP codes:
96701 · 96734 · 96744 · 96782 · 96795 96797 · 96801 · 96802 · 96803 · 96804 96805 · 96806 · 96807 · 96808 · 96809 96810 · 96811 · 96812 · 96813 · 96814 96815 · 96816 · 96817 · 96818 · 96819 96820 · 96821 · 96822 · 96823 · 96824 96825 · 96826 · 96828 · 96830 · 96836 96837 · 96838 · 96839 · 96840 · 96841 96843 · 96844 · 96846 · 96847 · 96848 96849 · 96850 · 96858 · 96859 · 96860 96863
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Hnl-windward-pearl Harbor (HI0000331) on EPA.gov.
Frequently Asked Questions
Is Hnl-windward-pearl Harbor water safe to drink?
Hnl-windward-pearl Harbor has only monitoring/reporting violations, which are procedural in nature. The system meets federal health-based standards.
How many people does Hnl-windward-pearl Harbor serve?
Hnl-windward-pearl Harbor serves approximately 631,389 people across 51 ZIP codes in Hawaii.
Where does Hnl-windward-pearl Harbor get its water?
The primary water source is groundwater.
Contact Your Water Utility
Public-record contact information for the water utility serving this system. Use these channels to request water quality reports, ask about service, or report issues directly.
Contact information from Board of Water Supply Consumer Confidence Report.
ZipCheckup is not affiliated with this water utility, does not act as its agent, and does not provide customer support for it. Contact details shown are public-record information from CCR filings. For service issues, contact the utility directly using the information above.
Federal UCMR5 PFAS Monitoring: Detected
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). PFAS compounds were detected below the current state-enforceable MCL.
Current MCL reflects the lowest state-enforceable limit (NYS 10 ppt for PFOA/PFOS, effective August 2020). The federal final MCL of 4 ppt for PFOA/PFOS (EPA April 2024 rule) is not enforceable until April 2029. Detections above 4 ppt but below 10 ppt are below current MCL but above the future federal limit.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
This system reports zero confirmed lead service lines in its inventory. Unknown-material counts may still warrant verification.
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.
How Water Systems Appear in Rankings
Water systems are evaluated by violation history, contaminant detections, and service population. Larger systems with more service connections appear in more rankings.
Frequently Asked Questions
What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
Hnl-windward-pearl Harbor (EPA ID: HI0000331) — request the latest Consumer Confidence Report or ask about specific contaminants.