Kapolei, HI Water Safety: 70/100 (2026)
2 ZIP codes · 3 water systems · Updated 2026-06-03
Residents of Kapolei generally live with tap water that beats the HI safety average on key EPA compliance metrics.
How Kapolei Compares
Data: EPA SDWIS Last verified: 2026-06-03
What You Should Know About Kapolei Water
- Estimated remediation: $1,700 per household.
- CDC health risk index: 10.63.
Who Supplies Your Water in Kapolei
Residential water service in Kapolei, HI is divided among 3 separate utilities, drawn from 3 systems on file with federal regulators.
Overview
We track water quality and home safety data for 2 ZIP codes in Kapolei, Hawaii (population ~49,316), covering 3 community water systems serving approximately 223,179 people region-wide.
No EPA violations recorded across any ZIP codes in Kapolei — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Kapolei: B (70/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Kapolei water systems draw from: Surface water.
Lead & Copper
- Lead data: not yet available for Kapolei
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 3 (Low Risk)
- Zone 1 (High): 0 ZIP codes
- Zone 2 (Moderate): 0 ZIP codes
- Zone 3 (Low): 2 ZIP codes
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 96707 | B | Waipahu-ewa-waianae | 217,479 |
| 96709 | C | WAIAWA CORRECTIONAL FACILITY | 444 |
All ZIP Codes in Kapolei
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
Health Outcomes in Kapolei
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Cost Context: What Remediation Means for Kapolei Homeowners
Within the Kapolei market, estimated remediation claims a small portion of typical property equity — the financial burden is proportionally low.
Remediation costs in Kapolei are relatively low compared to home values. The $1,100–$2,600 estimated range is a small fraction of median property value. Home values are 6% above the Hawaii average.
Flood & Climate Risk in Kapolei
Although Kapolei's flood history doesn't reach high-severity thresholds, NFIP data documents 2 claims and FEMA maps place 50% of ZIP codes in designated flood zones — a combined profile that makes flood-related water quality considerations a reasonable planning baseline.
Kapolei has a moderate flood history with 2 FEMA claims averaging $19,490 per payout. 50% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$1,700</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
Deep Dive Reports
Detailed analysis for Kapolei, HI