Kauai County, Hawaii
18 ZIP codes · Avg score 74/100 · Grade B · Updated 2026-06-03
Throughout Kauai County, the 18 monitored ZIP codes show low violation rates and healthy safety scores — a pattern that puts the county well above the state baseline for drinking water quality.
How Kauai County Compares
How Kauai County Compares
Kauai County scores 5 points below the Hawaii state average (79/100) and 6 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Kauai County, Hawaii
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 11.4 (asthma 10%, diabetes 12%)
Estimated additional annual cost per homeowner: $2,029, driven primarily by flood
Infrastructure: 0.361% avg pipe failure probability, 19% of ZIPs at high risk
60.9% of homes built before 1978 (lead paint era)
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $2,029
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
30,236 housing units in Kauai County
Source: U.S. Census Bureau ACS B25034 (Year Structure Built).
Water Safety Affordability
How much it costs to fix water issues relative to home values in Kauai County
Remediation costs are relatively manageable for most homeowners in Kauai County, representing a small fraction of property value.
Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.
Health Outcomes vs National Average
CDC PLACES data for Kauai County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 5 systems in Kauai County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Anahola | 2,473 | 0 |
| 2 | LIHUE-KAPAA | 34,854 | 0 |
| 3 | Moloaa Irrigation Cooperative | 100 | 0 |
| 4 | Kalaheo-koloa | 12,660 | 0 |
| 5 | Hanapepe-eleele | 5,592 | 0 |
13 total water systems serve Kauai County.
All ZIP Codes in Kauai County
18 ZIP codes tracked in Kauai County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 96751 | Kealia | 88 | A | 0 | — |
| 2 | 96741 | Kalaheo | 87 | A | 0 | $916K |
| 3 | 96747 | Kaumakani | 87 | A | 0 | — |
| 4 | 96722 | Princeville | 82 | B | 0 | $1214K |
| 5 | 96754 | Kilauea | 82 | B | 0 | $1144K |
| 6 | 96703 | Anahola | 77 | B | 0 | $528K |
| 7 | 96752 | Kekaha | 77 | B | 0 | $517K |
| 8 | 96766 | Lihue | 77 | B | 0 | $752K |
| 9 | 96765 | Lawai | 73 | B | 0 | $725K |
| 10 | 96769 | Makaweli | 73 | B | 0 | — |
| 11 | 96714 | Hanalei | 72 | B | 0 | $1169K |
| 12 | 96756 | Koloa | 72 | B | 0 | $910K |
| 13 | 96705 | Eleele | 66 | C | 0 | $685K |
| 14 | 96715 | Hanamaulu | 66 | C | 0 | — |
| 15 | 96898 | Wake Island | 66 | C | 0 | — |
| 16 | 96716 | Hanapepe | 65 | C | 0 | $738K |
| 17 | 96796 | Waimea | 65 | C | 0 | $574K |
| 18 | 96746 | Kapaa | 55 | C | 0 | $831K |
Recommended Buyer Guides for Kauai County
If FEMA records flag flood-top-risk status or EPA samples show PFAS exceedances, the matching logic lifts emergency-water and PFAS-rated filtration into the recommendations — federal data drives the order, not retailer arrangements.
- Best Lead Paint Test Kits — 60.9% of homes built before 1978
- Best Sump Pumps — Flood is the top compound risk factor
- Best Mold Test Kits — Flood-driven moisture and mold risk
Deep Dive Reports
Detailed analysis for Kauai County, Hawaii
Overview
Kauai County in Hawaii covers 18 ZIP codes with an average Home Safety Score of B (74/100).
No EPA violations recorded across any tracked ZIP codes in Kauai County.
← Back to Hawaii water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.