Division of Water Resources Identification of Select Emerging Compounds in the Public Water Supply Reservoir Jordan Lake (2024)

In response to the rising interest in the public health effects associated with per- and polyfluoroalkyl substances (PFAS) and 1,4-Dioxane in drinking water sources, the Intensive Survey Branch (ISB) conducted a special study alongside our Ambient Lakes Monitoring Program to characterize the presence and concentrations of these emerging compounds (EC) in public drinking water supply reservoir Jordan Lake. Beginning in January of 2024, ISB staff collected surface water samples for 1,4-Dioxane and 47 different per- and polyfluoroalkyl substances at three sampling locations on Jordan Lake (Appendix 1). Analytical results indicated the presence of at least six PFAS analytes above the laboratory practical quantitation limit (PQL) at each site during the 2024 sampling season. It is important to note that all analytical data presented in this document reflect levels of target analytes detected in untreated surface waters, as opposed to finished drinking water.