24/04/2026
Precautionary Boil Water Notice UPDATE – Now Applicable to Only Dededo and Yigo – ALL OTHER AREAS ARE NO LONGER SUBJECT TO THE PRECAUTIONARY BOIL WATER NOTICE:
The precautionary boil water notice (PBWN) issued by the Guam Waterworks Authority (GWA) through the Joint Information Center’s JIC Release No. 33 on April 16, 2026 has been updated, and is now effective for only Dededo and Yigo.
The PBWN was issued as a result of prolonged sustained loss of pressure in portions of the island’s distribution system as a result of Super Typhoon Sinlaku’s impact. A sustained loss in water pressure within the distribution system may result in potential, but unconfirmed bacterial contamination in your drinking water.
• For customers in Dededo and Yigo who experienced a loss in water service for 48 hours or less may wish to take precaution and are advised to bring all water to a boil, let it boil for three (3) minutes, and let it cool before using.
• For customers in Dededo and Yigo who experienced a loss in water service for 48 hours or more, GWA advises that is MANDATORY to bring all water to a boil, let it boil for three (3) minutes, and let it cool before using.
Boiled water should be used for drinking, making ice, brushing teeth, washing dishes, and food preparation until normal water supply has returned without interruption for at least 24 hours. Boiling kills bacteria and other undesirable organisms in the water.
Bacterial contamination can occur when increased run-off enters the drinking water source, if there is a loss of line pressure to less than 5psi, prolonged, sustained loss of water service, or failure in the water treatment process.
GWA’s Utility Compliance Laboratory continues to collect samples throughout the entire water distribution system and will continue sampling in areas as service is restored. Prior to returning to normal water service, GWA will ensure that the system is properly flushed, sampled and tested, and that chlorine levels and pressures have been confirmed to be within acceptable levels.
Analytical results will be available within 24 to 48 hours from the time of sample collection. As soon as the samples return negative results for f***l coliform and E. coli, GWA will notify the public as to when boiling water is no longer recommended or required.
For more information, please call GWA Dispatch at 671-646-4211. GWA Dispatch is available 24 hours a day, seven days a week.
WATER CONSERVATION COMPLIANCE MEASURES REMAIN FOR
DEDEDO AND YIGO
GWA has amended the water conservation compliance measure advisory following the storm recovery. Residents and businesses in Dededo and Yigo are encouraged to remain practicing water conservation measures to assist GWA in our efforts to increase reservoir levels. The Authority appreciates the continued patience and cooperation of the community during the emergency recovery phase. Water conservation plays a critical role in our restorative efforts to return water service to the island.
ALL ZONES PRESSURIZED
As of 9 p.m., 98 wells are online, with two (2) wells on standby power generation and 96 wells on the island-wide power system. All zones have been pressurized
Residents are reminded that even as pressure is restored, outages and instances of low to no pressure may occur as system adjustments are still being performed. As reservoir levels continue to rise, service at specific locations within the distribution system may vary throughout the day. Demand during peak hours will affect the rate at which pressure can build to acceptable service levels as reservoirs fill. To report outages in your area, please call GWA Dispatch at 671-646-4211. GWA Dispatch is available 24 hours a day, seven days a week.
