Comparative risk assessment of permethrin, chlorothalonil, and diuron to coastal aquatic species

► How species are grouped in risk assessment can lead to different risk conclusions. ► Three different classes of pesticide assessed for marine and estuarine species. ► 10th percentile values based on different species groups and all species combined. ► Most sensitive species compared to all species similar for permethrin and diuron. ► Risk results differed for pesticide of less specific mode of action; chlorothalonil.