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 | Mar 30, 2026 |
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 (30)
This water system has 30 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 | MCL | Yes | No | .035 | 0.002 mg/L | .002 | Archived | Feb 28, 1985 | — | |
| Jan 29, 1985 | Feb 28, 1985 | MCL | Yes | No | .035 | 0.002 mg/L | .002 | Archived | Feb 28, 1985 | — | |
| Jan 10, 1985 | Feb 9, 1985 | MCL | Yes | No | .004 | 0.002 mg/L | .002 | Archived | Feb 9, 1985 | — | |
| Jan 10, 1985 | Feb 9, 1985 | MCL | Yes | No | .004 | 0.002 mg/L | .002 | Archived | Feb 9, 1985 | — | |
| Jan 7, 1985 | Feb 6, 1985 | MCL | Yes | No | 46 | 0.002 mg/L | .002 | Archived | Feb 6, 1985 | — | |
| Jan 7, 1985 | Feb 6, 1985 | MCL | Yes | No | 46 | 0.002 mg/L | .002 | Archived | Feb 6, 1985 | — | |
| Jun 10, 1981 | Jul 9, 1981 | Other | No | No | — | — | — | Archived | Jul 9, 1981 | — | |
| May 10, 1981 | Jun 9, 1981 | Other | No | No | — | — | — | Archived | Jun 9, 1981 | — | |
| Mar 14, 1981 | Apr 13, 1981 | Other | No | No | — | — | — | Archived | Apr 13, 1981 | — | |
| Feb 10, 1981 | Mar 9, 1981 | Other | No | No | — | — | — | Archived | Mar 9, 1981 | — | |
| Jan 10, 1981 | Feb 9, 1981 | Other | No | No | — | — | — | Archived | Feb 9, 1981 | — | |
| Jan 10, 1981 | Feb 9, 1981 | Other | No | No | — | — | — | Archived | Feb 9, 1981 | — | |
| Sep 9, 1980 | Oct 8, 1980 | Other | No | No | — | — | — | Archived | Oct 8, 1980 | — | |
| Aug 14, 1980 | Sep 13, 1980 | Other | No | No | — | — | — | Archived | Sep 13, 1980 | — | |
| Jul 10, 1980 | Aug 9, 1980 | Other | No | No | — | — | — | Archived | Aug 9, 1980 | — | |
| May 14, 1980 | Jun 13, 1980 | Other | No | No | — | — | — | Archived | Jun 13, 1980 | — | |
| Dec 14, 1979 | Jan 13, 1980 | Other | No | No | — | — | — | Archived | Jan 13, 1980 | — | |
| Nov 14, 1979 | Dec 13, 1979 | Other | No | No | — | — | — | Archived | Dec 13, 1979 | — | |
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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.