Guam Water Quality
According to EPA Safe Drinking Water Information System (SDWIS), Guam has 5 active community water systems in this extract. PlainEnviro's health-based slice lists 12 violation records across 3 systems with at least one such row. These are historical EPA registry counts, not a statewide drinkability score.
Health-based violation records for 5 community water systems in Guam. Source: EPA Safe Drinking Water Information System (SDWIS).
Water Systems with Most Health-Based Records
| # | Water System | Health-Based Records | Health |
|---|---|---|---|
| 1 | U.S. NAVY WATER SYSTEM Fp | 6 | Yes |
| 2 | GWA CENTRAL WATER SYSTEM Mangilao | 4 | Yes |
| 3 | GWA SOUTHERN WATER SYSTEM Mangilao | 2 | Yes |
Most Common Contaminants in Guam
| Contaminant | Violations | Systems Affected |
|---|---|---|
| Revised Total Coliform Rule | 9 | 3 |
| TTHM | 3 | 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 Guam are included.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.