Guam Waterworks Authority

03/09/2026

GWA is aware of technical issues experienced by some of our GWA Text Alert subscribers. We apologize for the inconvenience, and we want our subscribers to know that our SMS casting vendor is working with local mobile phone service providers to address these technical issues. Please call 671-646-4211 for more information.

01/09/2026

Applications for point of entry installation and point entry or point of use reimbursement for approved filtration systems for eligible customers in the Santa Rosa Yigo area will be accepted through September 17, 2026. Visit guamwatersafety.com for more information.

To date, GWA contractors completed 309 point of entry filtration systems at homes in the Santa Rosa Yigo area as part of our dieldrin mitigation efforts. More installations are scheduled for completion.

On August 18, 2026, the Guam Environmental Protection Agency (GEPA) conditionally approved GWA’s August 15 proposal to commission the permanent treatment system installed at production well Y-15, and to remove and relocate the interim treatment system components from production well Y-15 to production well D-17.

Y-15’s interim GAC treatment system was removed on August 24, 2026. The permanent GAC treatment system was placed online on August 25, 2026. Two trains of GAC vessels (4 vessels total) are configured in a “lead-lag” series to ensure redundant treatment to minimize contaminant breakthrough. Y-15’s treatment system continues increased monitoring pursuant to GWA’s GEPA-approved dieldrin mitigation plan.

22/08/2026

21/08/2026

Emergency water outage - Assan-Ma’ina

Areas Affected: Nimitz Estates, Murray Rd. Turner Rd. and surrounding areas.

We appreciate your patience as NAVY crews work on a main water line repair.

Restoration to be announced.

20/08/2026

DRINKING WATER PROBLEM CORRECTED

Customers of the Northern Water System, Barrigada, Latte Heights, Mongmong-Toto-Maite, Mangilao, Route 15 and Yigo areas were notified on August 20,2026, of a potential problem with our drinking water and, while our distribution system samples indicated no contamination, out of an abundance of caution, customers were advised not to drink the water without boiling it first.

We are pleased to report that the potential problem has been corrected by providing an alternate source of water and that it is no longer necessary to boil the water before drinking it. We apologize for any inconvenience and thank you for your patience.

As always, you may contact GWA’s Dispatch at 671- 646-4211 with any comments or questions. Please share this information with all the other people who drink this water, especially those who may not have received this notice directly (for example, people in apartments, nursing homes, schools, and businesses).

You can do this by posting this notice in a public place or distributing copies by hand or
mail.

This notice is being sent to you by GWA Northern System, State Water System ID #: GU0000006.
Date distributed: 8/20/2026

30/07/2026

EPA Partial Consent Decree Progress Update on the ISLAND WASTEWATER SYSTEM:

GWA wastewater force main pipe condition assessments continue! Force mains are extremely difficult pipe to inspect. High pressure, turbulent flow conditions, and limited entry points make conventional inspection methods costly and disruptive, often requiring operators to bypass pumping or intrusive installations.

GWA contractors are using the latest in multi-sensor technology to collect data on force main lines at locations like Southern Link and Route 16 to detect leaks, gas pockets, and buildup, and changes in pipeline wall conditions.

GWA uses this data to gain insight better maintenance, protect our assets by reducing pump failures and sanitary sewer overflows.

23/07/2026

FINAL UPDATE: Precautionary boil water notice fully rescinded, all zones pressurized – July 23

PRECAUTIONARY BOIL WATER NOTICE FULLY RESCINDED
Effective immediately, the precautionary boil water notice (PBWN) issued by the Guam Waterworks Authority (GWA) on July 8, 2026, and partially rescinded on July 17, is now fully rescinded. On Thursday evening, GWA received concurrence from the Guam Environmental Protection Agency (GEPA) to fully rescind the PBWN.

ALL WATER SAMPLES CLEARED ANALYSIS
All 117 water samples collected from the distribution system from July 7 – 22 as part of typhoon recovery efforts have been confirmed NEGATIVE for total coliform. The distribution system continues to be monitored through routine sampling and analysis performed in accordance with the US EPA’s National Primary Drinking Water Regulations for public water systems.

7 PRODUCTION WELL REPAIRS COMPLETED
GWA production crew have completed repairs to grounded motors at seven water production wells affected by Super Typhoon Bavi. All repaired wells are back online and producing water for the distribution system.

TANKERS AND FLEX TANKS REMOVED
GWA water tankers and flex tanks previously deployed during recovery from Super Typhoon Bavi are being removed from service.

REPORT AN ISSUE
Contact GWA Dispatch at (671) 646-4211 or [email protected] to report water
issues such as low or no pressure, or wastewater issues such as backups and sewer overflows.

17/07/2026

PRECAUTIONARY BOIL WATER NOTICE PARTIALLY RESCINDED
Earlier this evening, the Guam Waterworks Authority (GWA) received concurrence from the
Guam Environmental Protection Agency (GEPA) to partially rescind the Precautionary Boil Water Notice (PBWN) issued on July 8, 2026.

Effective immediately, the PBWN remains in effect for only:

• Areas around Home Center, Dededo
• Cruz Street across Commercial Tire Depot Tire (lower Barrigada Heights)
• Route 8, Subway to KFC/Shell Gas station
• Areas surrounding Dimas Street, Mangilao

For customers in the areas listed above, is MANDATORY to boil your water and are advised:

• DO NOT DRINK THE WATER WITHOUT BOILING IT FIRST.
• 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 further notice.
• Boiling kills bacteria and other organisms in the water

A sustained loss of pressure within the distribution system may result in potential, but unconfirmed, bacterial contamination of drinking water. Bacterial contamination can occur when increased run-off enters the drinking water source, if line pressure drops below 5 psi, during prolonged or sustained loss of service, or from failure in the water treatment process.

16/07/2026

Effective at 6 a.m., the special water conservation compliance measure advisory issued by the Guam Waterworks Authority (GWA) on July 6, 2026, via Joint Information Center JIC Release #16 is rescinded. GWA appreciates the patience and cooperation from the community during the Super Typhoon Bavi emergency recovery phase. Compliance with water conservation was crucial in our restorative efforts to return water service to the island. Although water conservations measures have been lifted, GWA reminds the community that water is precious resource and should be used wisely.

16/07/2026

WELL REPAIR WORK UPDATES
The Guam Waterworks Authority (GWA) production crews completed repairs to wells A-6 in
Afame, Sinajana and D-26 in Ysengsong, Dededo. Water samples will be collected from both
wells. Repair work at well Y-5 in Yigo was completed yesterday and is pending water sample
analysis.
• Well Y-14: Back in production. Water samples cleared bacterial testing July 15.
• Well F-13: Back in production. Water samples cleared bacterial testing July 16.
• Well M-2: Back in production. Water samples cleared bacterial testing July 16.
• Well Y-5: Back online. Water samples pending analysis.
• Well A-6: Back online. Water samples pending analysis.
• Well D-26: Back online. Water samples pending analysis.
With each well placed back into production, GWA expects system pressure improvements in
parts of Mangilao, Agana Heights, Chalan Pago-Ordot, Sinajana, Astumbo and in central parts
of island.
CURRENT SYSTEM STATUS (AS OF 7 P.M.)
• Special Water Conservation measures remain in effect
• Precautionary Boil Water Notice remains in effect
• GWA estimates that approximately 198 customers out of 43,643 customer accounts are
without water service.
• 99 wells online — 98 on the island-wide power system (IWPS) and 1 on generator power
• 100% of booster pump stations online
• The Ugum Surface Water Treatment Plant, Tumon Maui and Santa Rita Springs are online
and on IWPS.
• All 112 water samples collected July 7–14 are confirmed NEGATIVE for total coliform
• All wastewater treatment plants operational on IWPS
• 98% of sewer pump stations online
GWA expects that water service availability at specific parts of the island will vary throughout
the day and may affect reporting data throughout the restoration process. GWA is aware of
areas experiencing low to no water pressure in parts of Agana Heights, Barrigada, Chalan
Pago-Ordot, Dededo, Harmon, Mangilao, Maina, Mongmong-Toto-Maite, Nimitz Hill Estates,
Sinajana, Santa Rita-Sumai, Talofofo, Tamuning, Yigo and Yona.