Hawaii Water Quality
Health violation data for 118 community water systems in Hawaii. Based on EPA Safe Drinking Water Information System (SDWIS) data.
Water Systems
118
Total Violations
29
Systems with Violations
16
Cities with Issues
8
Water Systems with Most Violations
| # | Water System | Violations | Health |
|---|---|---|---|
| 1 | MOLOAA IRRIGATION COOPERATIVE Anahola | 10 | Yes |
| 2 | WAIAWA CORRECTIONAL FACILITY Pearl City | 5 | Yes |
| 3 | SHASTA CASCADE MOBILEHOME PARK Honolulu | 1 | Yes |
| 4 | HILO Hilo | 1 | Yes |
| 5 | PAHALA Hilo | 1 | Yes |
| 6 | KUKUIHAELE Hilo | 1 | Yes |
| 7 | PEPEEKEO WATER ASSOCIATION Hilo | 1 | Yes |
| 8 | KEOPU WATER ASSOCIATION Holualoa | 1 | Yes |
| 9 | KAILUA Puunene | 1 | Yes |
| 10 | MAKAWAO Wailuku | 1 | Yes |
| 11 | LAHAINA Wailuku | 1 | Yes |
| 12 | MAUNALOA-KALUAKOI Maunaloa | 1 | Yes |
| 13 | LOWER KULA Wailuku | 1 | Yes |
| 14 | KAHAKULOA WATER CO. Wailuku | 1 | Yes |
| 15 | WAIAHOLE Honolulu | 1 | Yes |
| 16 | VILLA ROSE Wailuku | 1 | Yes |
Most Common Contaminants in Hawaii
| Contaminant | Violations | Systems Affected |
|---|---|---|
| Arsenic | 12 | 8 |
| Total Coliform (RTCR) | 10 | 1 |
| Gross Alpha | 3 | 3 |
| Combined Radium 226/228 | 2 | 2 |
| E. coli | 1 | 1 |
| Total Trihalomethanes (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 U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.