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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 - June 26, 2026
Dieldrin Sampling Results - Running Annual Average (RAA) – 124 SAMPLE LOCATIONS Wells RAA Remarks 30 Non-Detect (ND) • No detections for dieldrin 87 0.01 ppb to 0.09 ppb • 86 locations are less than 0.1 ppb or 50% of the IAL • D-17 offline since 7/31/25; treatment under construction. Result for samples taken on 3/10/26 is 0.1 ppb. RAA is 0.09 ppb. 4 0.10 ppb to 0.14 ppb • A-23 & A-25 offline since 2016; treatment under construction • M-2 & D-18 remain online; RAAs for both
nrlee52
Jun 261 min read
GWA Provides Sixth Mitigation Update to Sen. Lujan – Jun. 26, 2026
On June 26, 2026, the Guam Waterworks Authority (GWA) provided a sixth 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 office an
nrlee52
Jun 263 min read
GWA Provides Fifth Mitigation Update to Sen. Lujan – May 27, 2026
On May 27, 2026, the Guam Waterworks Authority (GWA) provided a followup to the the Authority's May 1 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 – INSTALLATIONS NOW IN PROGRESS: American Watertek began installing POE units on May 19, 2026 – with 39 installations completed as of this writing. SBS Guam began installing POE units on May 25, 2026 – with 16 inst
nrlee52
Jun 194 min read
Dieldrin Testing Data - May 27, 2026
Dieldrin Sampling Results - Running Annual Average (RAA) – 124 SAMPLE LOCATIONS Wells RAA Remarks 30 Non-Detect (ND) • No detections for dieldrin 87 0.01 ppb to 0.09 ppb • 86 locations are less than 0.1 ppb or 50% of the IAL • D-17 offline since 7/31/25; treatment under construction. Result for samples taken on 3/10/26 is 0.1 ppb. RAA is 0.09 ppb. 4 0.10 ppb to 0.14 ppb • A-23 & A-25 offline for PFAS since 2016; treatment under construction • M-2 & D-18 remain online; RAAs
nrlee52
May 271 min read
Dieldrin Testing Data - April 8, 2026
On March 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 March 25 reporting with analytical data from samples collected on April 8, 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 ppb or 50
nrlee52
May 11 min read
GWA Provides Fourth Mitigation Update to Sen. Lujan – May 1, 2026
On May 1, 2026, the Guam Waterworks Authority (GWA) provided a followup to the the Authority's March 25 update on GWA's dieldrin mitigation efforts following the conclusion of a joint oversight hearing held by the 38th Guam Legislature. GWA is pleased to report that post-storm assessments performed on well Y-15 and the interim granular activated carbon (GAC) treatment system confirm that the well, GAC vessels, plumbing and valving were not damaged by Super Typhoon Sinlaku and
nrlee52
May 14 min read
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
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