A review of the literature showed that trace pollutants and ECs receiving the most attention by researchers and regulators generally belong to one of three broad groups 1) industrials, 2) pesticides, or 3) pharmaceuticals and personal care products (PPCPs) (as shown in Tables 1-3). These broad groups are further subdivided by chemical type, and common uses with occurrence and toxicity data provided for specific compounds within each subgroup (Tables 1-3)