State rankings

Hawaii water-system rankings

Community water systems in Hawaii ranked by PurityRadar safety score — from EPA violations, enforcement, and PFAS data.

Lowest-scoring systems in Hawaii

Ranked lowest score first. Population shown for context.

1 SHASTA CASCADE MOBILEHOME PARK HONOLULU, HI · ~100 served 85 2 HNL-WINDWARD-PEARL HARBOR HONOLULU, HI · ~631,389 served 100 3 WAIPAHU-EWA-WAIANAE HONOLULU, HI · ~217,479 served 100 4 WAILUKU WAILUKU, HI · ~74,511 served 100 5 JOINT BASE PEARL HARBOR-HICKAM JBPPH, HI · ~65,230 served 100 6 MILILANI HONOLULU, HI · ~50,573 served 100 7 HILO HILO, HI · ~39,477 served 100 8 SCHOFIELD BARRACKS SCHOFIELD BARRACKS, HI · ~37,920 served 100 9 LIHUE-KAPAA LIHUE, HI · ~34,854 served 100 10 MAKAWAO WAILUKU, HI · ~29,868 served 100 11 NORTH KONA HILO, HI · ~29,581 served 100 12 WAHIAWA HONOLULU, HI · ~23,348 served 100 13 LAHAINA WAILUKU, HI · ~20,065 served 100 14 MARINE CORPS BASE HAWAII KANEOHE BAY, HI · ~16,300 served 100 15 KALAHEO-KOLOA LIHUE, HI · ~12,660 served 100 16 WAIKOLOA WAIKOLOA, HI · ~12,100 served 100 17 WAIPIO HEIGHTS HONOLULU, HI · ~11,516 served 100 18 WAIALUA-HALEIWA HONOLULU, HI · ~9,996 served 100 19 SOUTH KOHALA HILO, HI · ~9,612 served 100 20 KAANAPALI WAIKOLOA, HI · ~8,000 served 100 21 UPPER KULA WAILUKU, HI · ~7,686 served 100 22 FORT SHAFTER SCHOFIELD BARRACKS, HI · ~7,067 served 100 23 PRINCEVILLE PRINCEVILLE, HI · ~6,911 served 100 24 SOUTH KONA HILO, HI · ~6,512 served 100 25 NCTAMS EASTPAC JBPPH, HI · ~6,470 served 100

Highest-scoring large systems in Hawaii

Systems serving 10,000+ people with the best scores.

1 HNL-WINDWARD-PEARL HARBOR HONOLULU, HI · ~631,389 served 100 2 WAIPAHU-EWA-WAIANAE HONOLULU, HI · ~217,479 served 100 3 WAILUKU WAILUKU, HI · ~74,511 served 100 4 JOINT BASE PEARL HARBOR-HICKAM JBPPH, HI · ~65,230 served 100 5 MILILANI HONOLULU, HI · ~50,573 served 100 6 HILO HILO, HI · ~39,477 served 100 7 SCHOFIELD BARRACKS SCHOFIELD BARRACKS, HI · ~37,920 served 100 8 LIHUE-KAPAA LIHUE, HI · ~34,854 served 100

Hawaii directory → All states

Scores reflect EPA public records (violations, enforcement, PFAS), are system-level, and can’t account for your home’s plumbing. See the methodology.