Search broadly for contaminants using keywords such as pharmaceuticals, emerging organic contaminants, personal care products, persistent organic pollutants. Aspects of these chemicals can be described by using keywords: occurrence, transport, fate, behavior, removal. Combine with the keyword "water" will capture the broadest possibilities, but also consider including groundwater, wastewater, effluent, surface water, fresh water, streams, rivers. (See "Contaminants") tab in this guide for information on specific classes of chemicals.