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News & Updates
GWA is your trusted source for news and updates on water safety and dieldrin-related issues. We focus on providing comprehensive information to ensure you are well-informed about safe drinking water matters. Visit this page often as we will update the public on the safety issues related to drinking water in your area.
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For questions regarding whether you are impacted, contact GWA at 671-647-7800 or 671-647-7803
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For questions regarding health risks and water quality, contact Guam EPA Community Hotline at 671-888-4342
Dieldrin Testing Data - March 10, 2026
On February 25, 2026 GWA had previously reported the status of entry points that tested higher than, or equal to 50% of the IAL for dieldrin. The table below provides a status update to the February 25 reporting with analytical data from samples collected on March 10, 2026: Dieldrin Sampling Results - Running Annual Average (RAA) – 124 SAMPLE LOCATIONS Wells RAA Remarks 30 Non-Detect (ND) • No detections for dieldrin 86 0.01 ppb to 0.09 ppb • 86 locations are less than 0.1 pp
nrlee52
Mar 261 min read
GWA Provides Third Mitigation Update to Sen. Lujan – Mar. 25, 2026
On March 25, 2026, the Guam Waterworks Authority (GWA) provided a followup to the the Authority's February 25 update on GWA's dieldrin mitigation efforts following the conclusion of a joint oversight hearing held by the 38th Guam Legislature. Point-of-Entry (POE) Program: As of March 20, 2026, GWA has received 352 applications for POE provision and installation. Nine applications were cancelled at the request of the customer. Since January 28, 2026, GWA has completed 276 h
nrlee52
Mar 264 min read
GWA Provides Second Mitigation Update to Sen. Lujan – Feb. 29, 2026
On February 25, 2026, the Guam Waterworks Authority (GWA) provided a followup to the the Authority's January 29 update on GWA's dieldrin mitigation efforts following the conclusion of a joint oversight hearing held by the 38th Guam Legislature. Point-of-Entry (POE) Program: As of February 25, 2026, GWA has received 339 applications for POE provision and installation. GWA has completed 162 home assessments with American Watertek since January 28, 2026. As today, an additi
nrlee52
Mar 63 min read
GWA Provides Mitigation Update to Sen. Lujan – Jan. 29, 2026
On January 29, 2026, the Guam Waterworks Authority (GWA) provided the first update on the Authority's dieldrin mitigation efforts following the conclusion of a joint oversight hearing held by the 38th Guam Legislature. In the update to Sen. Jesse A. Lujan, Vice Speaker Tony Ada and Committee on Health Chair Sen. Sabrina Salas Matanane, GWA stated that the Authority " remains firmly committed to our dieldrin mitigation plans, and we appreciate the support from you and your off
nrlee52
Feb 273 min read
Dieldrin Testing Data from Samples Collected Nov. 11 & Nov. 13
On November 4, GWA had previously reported the status of entry points that tested higher than, or equal to 50% of the IAL for dieldrin. The table below provides a status update to the November 4 reporting with analytical data from samples collected on November 11 and November 13: Residents with questions about their water service or quality can contact GWA Customer Service at 671-647-7800 Monday through Friday from 7:30 a.m. to 6 p.m. and Saturday from 8 a.m. to noon. The Gua
GWA News
Dec 11, 20251 min read
COURTESY BOTTLED WATER DISTRIBUTION FOR SANTA ROSA/YIGO AREA CUSTOMERS ENDING NOV. 12
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
GWA News
Nov 10, 20251 min read
MULTIPLE TEST RESULTS CONFIRM Y-15 TREATMENT SYSTEM EFFECTIVE, GWA REQUESTS GEPA RESCIND DO NOT DRINK ADVISORY
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
GWA News
Nov 7, 20252 min read
Dieldrin IAL Update Release No. 4: FOR THE THIRD WEEK IN A ROW, TEST RESULTS SHOW NO DETECTION OF DIELDRIN AT WELL Y-15, TREATMENT SOLUTION SUCCESSFUL
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
GWA News
Nov 4, 20252 min read
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