Larry B. Barber

Environmental Science & Technology Cite this: Environ. Sci. Technol. 2025, XXXX, XXX Click to copy citationCitation copied! . This publication is licensed under CC-BY-NC-ND 4.0 . You are free to share (copy and redistribute) this article in any medium or format within the parameters below: Creative Commons (CC): This is a Creative Commons license. Attribution (BY): Credit must be given to the creator. Non-Commercial (NC): Only non-commercial uses of the work are permitted.

Imidacloprid: A Widespread and Persistent Hazard Imidacloprid was detected at most sites (44% of 12,547 samples; 72 out of 77 sites; Table 1 ) with the detection frequency significantly increasing from 42.0% in the first half of the study (2013–2017; total samples = 6,467) to 45.4% in the second half (2018–2022; total samples = 6,080).

Managing per- and polyfluoroalkyl substances (PFAS) in water resources requires a basin-scale approach. Predicted environmental concentrations (PEC) and stream-vulnerability scores for PFAS were determined for the Potomac River watershed in the eastern United States. Approximately 15% of stream reaches contained municipal and/or industrial wastewater treatment plant (WWTP) discharges that are presumptive PFAS sources, comprising from <1 to >90% of streamflow.