Northern Mariana Islands Water Quality
According to EPA Safe Drinking Water Information System (SDWIS), Northern Mariana Islands has 36 active community water systems in this extract. PlainEnviro's health-based slice lists 168 violation records across 13 systems with at least one such row. These are historical EPA registry counts, not a statewide drinkability score.
Health-based violation records for 36 community water systems in Northern Mariana Islands. Source: EPA Safe Drinking Water Information System (SDWIS).
Water Systems with Most Health-Based Records
| # | Water System | Health-Based Records | Health |
|---|---|---|---|
| 1 | Commonwealth Utilities Corp (Saipan) Saipan | 80 | Yes |
| 2 | Pacific Palms Saipan | 18 | Yes |
| 3 | Aqua Water Saipan | 16 | Yes |
| 4 | Crystal Ice And Water Saipan | 12 | Yes |
| 5 | Commonwealth Utilities Corp (Rota) Saipan | 9 | Yes |
| 6 | Diamond Water Gualo Rai Saipan | 7 | Yes |
| 7 | Modern Stationary Saipan | 6 | Yes |
| 8 | Commonwealth Utilities Corp (Tinian) Saipan | 5 | Yes |
| 9 | The Water Company Saipan | 4 | Yes |
| 10 | Afetna Supermarket Saipan | 4 | Yes |
| 11 | Tropical Drinking Water Saipan | 3 | Yes |
| 12 | Saipan Vegas Saipan | 2 | Yes |
| 13 | San Jose Mart Water Saipan | 2 | Yes |
Most Common Contaminants in Northern Mariana Islands
| Contaminant | Violations | Systems Affected |
|---|---|---|
| Groundwater Rule | 151 | 11 |
| Revised Total Coliform Rule | 12 | 2 |
| Coliform (TCR) | 4 | 2 |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | 1 | 1 |
Cities with Water Quality Issues
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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 Northern Mariana Islands are included.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.