Waikoloa, HI Water Safety: 87/100 (2026)
1 ZIP code · 4 water systems · Updated 2026-06-03
How does Waikoloa tap water hold up under EPA scrutiny? Above average for HI — documented violations are uncommon and the safety grade reflects a clean overall record.
How Waikoloa Compares
Data: EPA SDWIS Last verified: 2026-06-03
What You Should Know About Waikoloa Water
- Homes built before 1986: 28% — older plumbing may contain lead solder.
- Estimated remediation: $1,800 per household.
- CDC health risk index: 12.35 — above typical levels.
Who Supplies Your Water in Waikoloa
4 water systems are tracked federally in Waikoloa, HI. The top 3 providers collectively serve most residential addresses, but because they operate independently, infrastructure maintenance standards and compliance histories differ from one service zone to another.
Overview
We track water quality and home safety data for 1 ZIP code in Waikoloa, Hawaii (population ~7,407), covering 4 community water systems serving approximately 25,616 people region-wide.
No EPA violations recorded across any ZIP codes in Waikoloa — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Waikoloa: A (87/100)
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
Waikoloa water systems draw from: Groundwater.
Lead & Copper
- Lead data: not yet available for Waikoloa
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 3 (Low Risk)
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 96738 | A | Waikoloa | 12,100 |
All ZIP Codes in Waikoloa
- 96738 [A]
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 Waikoloa
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
Housing & Infrastructure in Waikoloa
Housing age data helps assess potential lead pipe and infrastructure risks. Newer housing stock generally means lower plumbing-related contamination risk.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Waikoloa has a newer housing profile — median build year 1995, placing most homes after the 1986 lead-solder ban.
Most homes in Waikoloa were built after 1986, reducing the risk of lead contamination from plumbing. Older homes should still be tested.
Source: U.S. Census Bureau ACS B25034.
Cost Context: What Remediation Means for Waikoloa Homeowners
In Waikoloa, documented water and safety issues can be addressed without making a meaningful dent in home equity — the financial proportionality here is favorable, and the commitment fits within standard property planning frameworks.
Remediation costs in Waikoloa are relatively low compared to home values. The $1,200–$2,500 estimated range is a small fraction of median property value. Home values are 6% below the Hawaii average.
Lead Exposure Risk for Children in Waikoloa
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Where pre-rule stock represents a smaller fraction of the inventory — 28% across Waikoloa — the structural drivers of household exposure run thinner. Aggregate readings under the federal benchmark reinforce that picture, with one-home draws remaining the only direct measurement for a specific address.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Flood & Climate Risk in Waikoloa
Flood exposure in Waikoloa is meaningful by NFIP measures — 1 claim on record and 100% of ZIP codes carrying FEMA flood zone designations. That level of activity makes flood history a relevant factor when evaluating local water quality over time.
Waikoloa has a moderate flood history with 1 FEMA claims averaging $38,946 per payout. 100% 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>$1,800</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 Waikoloa, HI