Evaluation and human health risk assessment of Trihalomethane in the drinking water network of some areas in Baghdad city.

Healthy water is considered a basic requirement for the continuation of life, so it requires continuous evaluation, in order to eliminate existing pollutants. Trihalomethane (THM) is one of these pollutants that are formed from the reaction of organic matter with residual free chlorine. The aim of the study is to evaluate THM in water and study its harmful carcinogenic risks to humans. Therefore, samples were collected from 10 different locations within the Al Wathba Water Station distribution network in the city of Baghdad, to study the evaluation of THM and other properties such as pH, EC, TDS, TOC T. From this study it was concluded that all the properties studied were within the standard specifications except (residual free chlorine). The pH of some areas was higher than the specified limits All THM values were within standard limits and Bromodichloromethane values were zero. Toxicological risks and lifetime cancer risks for THM were studied by three routes: oral, dermal absorption, and inhalation. The model USEPA of risk assessment was modeled as hazard quotients (HQ) and the results were compared with WHO-specified values. Global and found Chloroform, Bromodichloromethane, and Dibromochloromethane within the specifications except for FC. From the results of the assessments of the 4 THMs pathways for cancer risk throughout life, and across the previous three methods, it was Chloroform =2.08*10-6, DBCM= 4.6*10-6, and BF= 4.65*10-6, but the BDCM was zero, these results higher than the American Environmental Protection Agency and all THMs. It increases the risk of cancer. [ABSTRACT FROM AUTHOR]