Hawaii County Water Quality Reports
Water quality reports for all counties in Hawaii. Browse by county to see safety scores, violations, and ZIP code data.
Browse water quality data by county in Hawaii. Each county page lists all ZIP codes with safety scores and EPA violation data.
Hawaii County, HI: 1 Health Violation — 76/100 (2026)
2026 report: Hawaii County, HI scores 76/100 (Grade B). 35 ZIP codes analyzed. 5 EPA violations found. Free report with contaminant data and filter picks.
Honolulu County, HI: 4 Violations — 80/100 (2026)
2026 report: Honolulu County, HI scores 80/100 (Grade B). 66 ZIP codes analyzed. 4 EPA violations found. Free report with contaminant data and filter pi...
Kalawao County, HI: 1 Violation — 86/100 (2026)
2026 report: Kalawao County, HI scores 86/100 (Grade A). 1 ZIP code analyzed. 1 EPA violation found. Free report with contaminant data and filter picks.
Kauai County, HI Water Safety: 74/100 (2026)
2026 report: Kauai County, HI scores 74/100 (Grade B). 18 ZIP codes analyzed. No EPA violations. Free report with contaminant data and filter picks.
Maui County, HI: Lead Above EPA Limits — 82/100 (2026)
2026 report: Maui County, HI scores 82/100 (Grade B). 17 ZIP codes analyzed. 6 EPA violations found. Lead above EPA limits. Free report with contaminant...
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