In this study, trihalomethanes (THMs) were looked for in drinking water samples taken from the more than 3 million people served by the water treatment facilities in Beni-Suef Governorate. Monthly samples of drinking water were taken during 2017 and 2018 from 5 locations. In the outputs of water treatment plants, THM readings ranged from 27.0 to 88.80 µg/l. The outlets of water treatment plants have chloroform values ranging from 12.1 to 45.80 µg/l. All values of the non-cancer hazard quotient for chloroform that are already below the risk value recommended by general guidance (170x10-3). Dichlorobromomethane levels in water treatment plant exits varied from 8.1 to 31.4 µg/l in all cases. Each and every dichlorobromomethane cancer risk value that is lower than the overall recommended risk value (99.2 106). The range of dibromochloromethane values was less than. Every cancer risk rating for dibromochloromethane is lower than the overall recommended risk value for Class A carcinogens (134.4 x 106). In the current study, all examined water samples demonstrated that bromoform was not found throughout the investigation. All THM cancer risk values are below the overall recommended risk value for Class A carcinogens (165.3 x 106). The study demonstrated that THM levels and its constituent parts complied with Egyptian regulations and that the majority of risk values related to THMs fell within permissible bounds.