It's there as a jumble of keywords and links to other articles. It looks like DEET goes through people and into waste water, where it can't be easily removed. It was selected for a study about chemicals that are difficult to remove because there is enough of it to detect and it is so durable:

Due to the resistance to UV photolysis and chloramination, DEET was selected as the target pollutant to investigate the contributions of HO· and RCS on its degradation by the UV/NH2Cl process (Antonopoulou et al., 2013). In this study, the objectives were to: (1) investigate the degradation of DEET in the UV/NH2Cl process under various conditions and evaluate the relative contributions of reactive species; (2) investigate the effects of several water quality parameters including initial pH, water temperature, coexistence anions and natural organic matter (NOM); (3) examine the plausible degradation pathways based on LC-MS analysis and density functional theory (DFT) calculation; (4) evaluate toxic effects of DEET and its transformation products (TPs) through acute toxicity tests and quantitative structure-activity relationship (QSAR) analysis; (5) analyse the energy efficiency of UV/NH2Cl process in terms of electrical energy-per-order (EE/O). The results obtained in this study will provide the guidance for the application of UV/NH2Cl process in drinking water and wastewater treatment.

Do you really want that on your skin?