This document has been prepared to allow toxicological evaluation of the unregulated 3 contaminant isobornyl methacrylate (IBOMA) in drinking water, as an extractant from one or 4 more drinking water system components evaluated under NSF/ANSI 61 (2014), or as a 5 contaminant in a drinking water treatment chemical evaluated under NSF/ANSI 60 (2014). Both 6 non-cancer and cancer endpoints have been considered, and risk assessment methodology 7 developed by the U.S. Environmental Protection Agency (U.S. EPA) has been used.