AWWA has released three important per- and polyfluoroalkyl substances (PFAS) documents to assist water utilities: Drinking Water Treatment for PFAS Selection Guide , Source Water Evaluation Guide for PFAS and Summary of Toxicological Research for PFAS . Drinking Water Treatment for PFAS Selection Guide - As state and federal regulatory efforts continue to move forward, water professionals are increasingly faced with requirements to manage PFAS occurrence in finished drinking water supplies. As the science for PFAS continues to develop, and with it the science around drinking water treatment, the selection of appropriate PFAS treatment technologies may be difficult. Whether the decision to implement PFAS treatment is driven by community stakeholders or regulatory requirements, the selection of a drinking water treatment technology is a critical step to ensure system efficiency and longevity in exchange for the investment. AWWA’s Drinking Water Treatment for PFAS Selection Guide provides technical information on PFAS chemistry, proven technologies for PFAS treatment, special considerations when deploying these technologies in practice, and strategies for selecting treatment and design parameters. This guide was developed not only to assist systems actively addressing PFAS due to regulatory or non-regulatory drivers, but also to help water professionals better understand the challenges and considerations necessary in implementing these treatment technologies. Source Water Evaluation Guide for PFAS – The Source Water Evaluation Guide for PFAS was developed in collaboration between AWWA volunteers and technical experts and is intended to support water professionals in understanding and characterizing the potential for PFAS occurrence in drinking water supplies. The guide provides background on PFAS characteristics and history, detailed information on the known sources of PFAS in the environment, and analytical methods and strategies for developing a monitoring plans. It also includes information about the importance of stakeholder communication throughout the process. The guide was developed to support water professionals working to address community concerns as PFAS science develops and state and federal regulatory activity moves forward. Efforts such as the Fifth Unregulated Contaminant Monitoring Rule (UCMR 5), which will require finished drinking water monitoring for 29 PFAS from 2023-2025, will continue to add pressure to water systems to stay informed on PFAS issues. Summary of PFAS Toxicological Research – As the science for PFAS continues to rapidly develop, research worldwide to characterize the toxicity of PFAS is of great importance. These efforts include independent studies performed by universities, state and federal agencies, international agencies and other organizations. At the same time, these efforts are focusing on wide range of specific aspects of PFAS toxicity, including varying PFAS compounds, levels of exposure, routes of exposure, duration of exposure, and health endpoints. With the generation of all this information, water systems face the difficult challenge of communicating about potential risks of PFAS exposure through drinking water. Effective risk communication for PFAS in drinking water hinges on the reliability and clarity of messaging about the state of the science for PFAS toxicity. The Summary of Toxicological Research for PFAS was developed to provide water professionals with relevant toxicity research for PFAS as well as to characterize the state of that research. This report not only describes the wide-ranging efforts in the United States to better understand PFAS toxicity, but also assessments conducted by states and international agencies. This report also describes the noteworthy research gaps that exist and must be addressed. These resources expand on the AWWA PFAS Fact Sheets and were developed with input from technical experts and volunteers. The documents, which are free to members, bring together a wide range of information to support water systems’ efforts to address PFAS and are available on AWWA’s PFAS Resource page . Questions about the documents can be directed to Chris Moody , AWWA’s regulatory technical manager.