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The Guam Waterworks Authority (GWA) announced today that its courtesy bottled water distribution for customers in the Santa Rosa/Yigo area will conclude on Wednesday, Nov. 12, following four consecutive weeks of sampling and analysis at Well Y-15. Laboratory results of water samples collected on Oct. 11, 16, 23, and 29 all showed non-detect levels for dieldrin in the treated water. These consistent results confirm that the water from Well Y-15 is now safe to drink, cook wi

Today, the Guam Waterworks Authority (GWA) submitted a formal response to the Guam Environmental Protection Agency (EPA), requesting to rescind the “Do Not Drink Without Treatment” advisory for the Santa Rosa/Yigo area. GWA’s letter follows four weeks of comprehensive monitoring, treatment, and testing that confirms GWA’s drinking water from well Y-15 has no detection of dieldrin. Laboratory analysis performed with raw and finished water samples collected on Oct. 11, Oct. 16

No dieldrin has been detected at well Y-15 in Yigo after treatment, according to confirmed laboratory analysis after three rounds of testing.  The results of “non-detect” continues to affirm the Guam Waterworks Authority’s (GWA) interim treatment system at well Y-15 has successfully removed dieldrin levels. This system, completed on Oct. 10, uses granular activated carbon (GAC) filtration, an EPA-approved and proven technology used to remove contaminants like dieldrin and PFA

No dieldrin has been detected at well Y-15 in Yigo, according to confirmed laboratory analysis after two rounds of testing.  The results of “non-detect” affirms the Guam Waterworks Authority’s (GWA) interim treatment system at well Y-15 has successfully removed dieldrin levels. This system, completed on Oct. 10, uses granular activated carbon (GAC) filtration, an EPA-approved and proven technology used to remove contaminants like dieldrin and PFAS from drinking water. Dieldr

Effective immediately, Guam Waterworks Authority (GWA) customer service call center will return to normal hours of Monday through Friday from 7:30 a.m. to 6 p.m. and Saturday from 8 a.m. to noon.  Customers can reach the call center at 671-647-7800 / 7803. Additionally, customers may submit questions and service requests to the online customer portal at gwa.custhelp.com  at their convenience.  The return to normal hours comes after GWA previously offered extended call center

(Mangilao, GU)  — On Oct. 12, the Guam Waterworks Authority (GWA) completed the successful installation of its interim treatment system...

Application forms available online. Review the FAQ's provided below to help you select the correct application form to submit to GWA....

Affected residents in Yigo/Santa Rosa may visit GWA's newest flexitank filling station on Chalan Emsley with their containers to obtain...

GWA's Surface and Springs Unit recently performed the annual replacement of Granular Activated Carbon (GAC) filters at the Tumon Maui Well. This same type of filtration treatment will be installed at other well sites to filter dieldrin and other contaminants found in the groundwater.

As of October 5, 2025, no boil water notice for Yigo and Mangilao has been issued by Guam Waterworks Authority (GWA) or Guam...

Affected residents in YIGO who safe water supply may visit any of these water outposts serviced by GWA emergy crews.

Mayors' Council of Guam Regular Monthly Meeting - October 1, 2025

GWA in coordination with the Yigo Mayor's office will be providing limited supplies of bottled water to affected customers in the Santa Rosa zones.

Guam Waterworks Authority (GWA) continues prioritizing immediate and long-term treatment solutions for the Y-15 well in Yigo, which has shown elevated levels of dieldrin, a pesticide. GWA has been working on the immediate issues at Y-15 but continues to work proactively on protecting all of GWA’s water sources.

GWA: ELEVATED DIELDRIN LEVELS LIMITED TO WELL Y-15 ( MANGILAO, GU) —Guam Waterworks Authority (GWA) confirms well Y-15 located in Yigo is...

Originally released by GWA on September 8, 2025 (UPDATED: 09/29/2025) The Santa Rosa Area of Northern Water System PWS ID# GU0000006 has...

Dieldrin Update as of September 26, 2025 - Correction on Wells, New Hotline.