join us for the GRACast:

Predictions of groundwater pfas OCCURRENCE at drinking water supply depths in the united states

Join us Virtually

Wednesday, February 26th, 2025 | 12:00 p.m. - 1:00 p.m.  

Location

Virtual Zoom

Predictions of Groundwater PFAS Occurrence at Drinking Water Supply Depths in the United States

Description:

This GRACast will present recent work by a USGS team on a national model for predicting the occurrence of PFAS in groundwater used for drinking water supplies (Tokranov et al., 2024, https://doi.org/10.1126/science.ado6638; Gordon et al., 2024, https://geonarrative.usgs.gov/pfasinusgroundwater). Per- and polyfluoroalkyl substances (PFAS), known colloquially as “forever chemicals,” have been associated with adverse human health effects and have contaminated drinking water supplies across the United States owing to their long-term and widespread use.

People in the United States may unknowingly be drinking water that contains PFAS because of a lack of systematic analysis, particularly in domestic water supplies. We present an extreme gradient–boosting model for predicting the occurrence of PFAS in groundwater at the depths of drinking water supply for the conterminous United States. Our model results indicate that 71 million to 95 million people in the conterminous United States potentially rely on groundwater with detectable concentrations of PFAS for their drinking water supplies before any treatment.

MODERATOR:

John Xiong, Ph.D., P.E.
Principal Engineer and Applied Research Leader at Haley & Aldrich, Inc.

Dr. John Xiong is a Principal Engineer and Applied Research Leader at Haley & Aldrich, Inc. He has 20 years of experience in environmental consulting, research, and litigation support, focusing on contaminated site investigation and remediation. He has developed cost-effective and streamlined strategies for final remedies accepted by federal and state regulatory agencies on projects that entail complex technical and policy issues. As a Principal Investigator, he leads multiple applied research projects funded by federal agencies to develop and demonstrate innovative technologies for PFAS treatment and assessment. He has published over 20 articles in peer-reviewed scientific journals and is a primary inventor of two patents for remediation technologies. John currently serves as a Director for the Groundwater Resources Association of California (GRA).

SPEAKER:

Miranda S. Fram, Ph.D.
Supervisory Chemist, U.S. Geological Survey California Water Science Center 
mfram@usgs.gov

Dr. Miranda Fram joined the USGS California Water Science Center in 1997 and has worked on a variety of projects, mostly related to water quality. Since 2014 she has been the Project Chief for the Groundwater Ambient Monitoring and Assessment (GAMA) Program Priority Basin Project, a cooperative project between the USGS and the State Water Boards' GAMA Program.

LOCATION:

Virtual Only

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CONTACT INFORMATION:

John Xiong
jxiong@haleyaldrich.com