Guam Waterworks Authority
578 N. Marine Drive
Tamuning, Guam 96913

Guam Waterworks Office is located along Route 1 (Marine Drive), Upper Tumon behind GTA and adjacent to Department of Public Works.

Office Hours are from 8:00am to 4:30pm daily Monday thru Friday.  Administrative Offices are closed on weekends and Government of Guam Holidays.