This report summarizes the results from a research project involving NOAA’s National Centers for Coastal Ocean Science (NCCOS) along with local partners and with funding from NOAA’s Coral Reef Conservation Program (CRCP), to characterize dissolved concentrations of chemical contamiants in the water column around Cocos Island in Cocos Lagoon, Guam. The work was a followup from a project in 2015 to characterize chemical contaminants in sediments and fish in Cocos Lagoon.