The Pyrethroid Working Group (PWG) compiled data on measured concentrations of 9 synthetic pyrethroids and associated metadata from US surface water and sediment monitoring programs. Results were characterized in terms of the detection frequencies and concentration distributions of each pyrethroid. Most data were from flowing water, and more than 90% of samples were from California (CA). Concentrations and detection frequencies of pyrethroids, especially in urban sediments, were greater in CA than the rest of the US. Water monitoring programs often included event-driven sampling, intended to capture peak pyrethroid concentrations associated with storm events. Many programs targeted sites where pesticide concentrations were expected to be greatest, such as storm drain sumps. Most water samples were unfiltered, and pyrethroid concentrations were dominated by particle-bound material which is not bioavailable and does not contribute to toxicity. Sediment sampling programs usually targeted depositional areas, where pyrethroid concentrations are greatest but which occupy only a small fraction of most streams. For these reasons, the database is considered to reflect the high end of the expected pyrethroid concentration ranges in urban and agricultural watersheds.

Summary and interpretation of monitoring data for synthetic pyrethroids in US surface water and sediment

248th National Meeting (2014)

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