GWA NORTHERN WATER SYSTEM
GU — Community Water System — PWSID: GU0000006
System Information
| PWSID | GU0000006 |
| System Name | GWA NORTHERN WATER SYSTEM |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | State |
| EPA Region | 09 |
| Serves School | No |
| Wholesaler | Yes |
| First Reported | Mar 10, 1980 |
| Last Reported | Dec 30, 2025 |
Location & Contact
| State | GU |
| City | MANGILAO |
| ZIP Code | 96913 |
| Address | Gloria B. Nelson Public Service Building |
| Organization | BORDALLO, MIGUEL |
| Phone | 671-300-6845 |
Population & Service
| Population Served | 139,207 |
| Service Connections | 39,541 |
Drinking Water Violations (8)
This water system has 8 violations recorded in the EPA SDWIS database.
| Begin Date | End Date | Contaminant | Category | Health-Based | Major | Measured | Federal MCL | State MCL | Status | Return to Compliance | Rule |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan 29, 1985 | Feb 28, 1985 | Mercury | MCL | Yes | No | .035 | 0.002 mg/L | .002 | Archived | Feb 28, 1985 | Inorganic Chemicals |
| Jan 29, 1985 | Feb 28, 1985 | Mercury | MCL | Yes | No | .035 | 0.002 mg/L | .002 | Archived | Feb 28, 1985 | Inorganic Chemicals |
| Jan 10, 1985 | Feb 9, 1985 | Mercury | MCL | Yes | No | .004 | 0.002 mg/L | .002 | Archived | Feb 9, 1985 | Inorganic Chemicals |
| Jan 10, 1985 | Feb 9, 1985 | Mercury | MCL | Yes | No | .004 | 0.002 mg/L | .002 | Archived | Feb 9, 1985 | Inorganic Chemicals |
| Jan 7, 1985 | Feb 6, 1985 | Mercury | MCL | Yes | No | 46 | 0.002 mg/L | .002 | Archived | Feb 6, 1985 | Inorganic Chemicals |
| Sep 9, 1980 | Oct 8, 1980 | Other | No | No | — | — | — | Archived | Oct 8, 1980 | Miscellaneous Other Rules | |
| Jul 10, 1980 | Aug 9, 1980 | Other | No | No | — | — | — | Archived | Aug 9, 1980 | Miscellaneous Other Rules | |
| May 14, 1980 | Jun 13, 1980 | Other | No | No | — | — | — | Archived | Jun 13, 1980 | Miscellaneous Other Rules |
About This Water System
Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.