Pyrethroid Aquatic Toxicity Database

As part of the ongoing effort to provide access to the best scientific data available on the pyrethroid class of insecticides, the Pyrethroid Working Group has compiled a database of all aquatic toxicity studies for nine synthetic pyrethroids: bifenthrin, cyfluthrin, cyhalothrin, cypermethrin, deltamethrin, esfenvalerate, fenpropathrin, permethrin, and tefluthrin. These studies have been reviewed and evaluated to identify the most reliable toxicity values for each species tested.

Data were obtained from a variety of sources, including company-provided studies, open literature publications identified through bibliographic database searches, and the U.S. Environmental Protection Agency’s on-line database ECOTOX. Each publication or report was assigned a score of Acceptable (A), Qualified (Q), or Unusable (U) according to pre-established criteria. Information for each study rated A or Q was extracted from the documents for incorporation into the database. A bibliography of data sources is provided. PWG used a two-step process to select the most appropriate data for risk assessment purposes, following a set of specific criteria described in the metadata:

  1. A single result from each study was designated as the Key Value for that study
  2. All Key Values for a species were examined, and a single Species Final Value was selected

Results can be examined using standard spreadsheet search and filter functions. Data can be searched or filtered by:


To review this database, please register below:

  • This field is for validation purposes and should be left unchanged.