Hawaii Water Quality
According to EPA Safe Drinking Water Information System (SDWIS), Hawaii has 118 active community water systems in this extract. PlainEnviro's health-based slice lists 31 violation records across 16 systems with at least one such row. These are historical EPA registry counts, not a statewide drinkability score.
Health-based violation records for 118 community water systems in Hawaii. Source: EPA Safe Drinking Water Information System (SDWIS).
Water Systems with Most Health-Based Records
| # | Water System | Health-Based Records | Health |
|---|---|---|---|
| 1 | MOLOAA IRRIGATION COOPERATIVE Anahola | 10 | Yes |
| 2 | WAIAWA CORRECTIONAL FACILITY Pearl City | 5 | Yes |
| 3 | KEOPU WATER ASSOCIATION Holualoa | 2 | Yes |
| 4 | VILLA ROSE Wailuku | 2 | Yes |
| 5 | SHASTA CASCADE MOBILEHOME PARK Honolulu | 1 | Yes |
| 6 | HILO Hilo | 1 | Yes |
| 7 | PAHALA Hilo | 1 | Yes |
| 8 | KUKUIHAELE Hilo | 1 | Yes |
| 9 | PEPEEKEO WATER ASSOCIATION Hilo | 1 | Yes |
| 10 | KAILUA Puunene | 1 | Yes |
| 11 | MAKAWAO Wailuku | 1 | Yes |
| 12 | LAHAINA Wailuku | 1 | Yes |
| 13 | MAUNALOA-KALUAKOI Maunaloa | 1 | Yes |
| 14 | LOWER KULA Wailuku | 1 | Yes |
| 15 | KAHAKULOA WATER CO. Wailuku | 1 | Yes |
| 16 | WAIAHOLE Honolulu | 1 | Yes |
Most Common Contaminants in Hawaii
| Contaminant | Violations | Systems Affected |
|---|---|---|
| Surface Water Treatment Rule | 12 | 8 |
| Coliform (TCR) | 10 | 1 |
| LEAD AND COPPER RULE REVISIONS | 5 | 3 |
| Lead and Copper Rule | 2 | 2 |
| Revised Total Coliform Rule | 1 | 1 |
| TTHM | 1 | 1 |
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About This Data
Water quality data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations. Only community water systems (CWS) in Hawaii are included.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.