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Not health advice. Contact your local water utility for concerns.
Data from EPA Water Quality Reports. For official information, contact your water utility or health department.
Compare water quality across 3 counties in Hawaii
3 counties ranked by average water quality score
| Rank | County | Avg Score | Grade | Cities | Population | Score Range |
|---|---|---|---|---|---|---|
| 1 | Hawaii County | 89 | A- | 1 | 45,703 | 89 - 89 |
| 2 | Maui County | 83 | B+ | 2 | 47,760 | 81 - 84 |
| 3 | Honolulu County | 80 | B+ | 12 | 685,136 | 67 - 92 |
Our county-level water quality analysis aggregates data from municipal water systems across Hawaii. Each county's score represents the average water quality across all analyzed cities within that county, weighted by population served.
With 3 counties and 15 cities analyzed, this data helps residents understand regional water quality patterns in Hawaii. County scores range from 67/100 to 92/100, reflecting the diversity of water sources and treatment infrastructure across the state.
All analyzed counties in Hawaii maintain average scores above 70, indicating generally acceptable water quality standards statewide. Individual city scores may vary, so residents should still review their specific city's report.