Chlorfenvinphos (CFVP) was added to samples of treated municipal wastewater and oxidized in the presence of TiO2 and UV, O-3 and UV radiation or sulfate radicals generated in the presence of Na2S2O8, glucose and visible light (PDS + Vis) for 10 and 20 min. The CFVP content in the tested samples was detd. by HPLC method. The highest degree of CFVP degrdn. (82%) was obtained using the PDS + Vis method.