The process of water chlorination to the water contains a considerable amount of TOC can lead to the figuration of some π-products that are highly harmful to human health. Among all the chlorination π-products, trihalomethanes (THMs) is exhibit highly carcinogenic activity. This study tries to identify the main factors that play a critical role in the THM formation and control its mechanisms at different stages. (WHO) usually, measure free residual chlorine values at levels less than the recommended values. The concentrations of THMs formed in the water network vary depending on the concentration of TOC in the discharged spring water, and the chlorine dose plays an important role in this process by increasing the contact time. The THM levels in the tap water of Jericho and Aqbat Jabber camp are at levels below the USEPA limit of 80µg/L, as well as the WHO limit of 100 µg/L. CHBr3 was found to be the major contributor to the total THMs. CHCl3 found to be the dominant sort detected after the chlorination of each sample in the experiment. The THM detected at high-temperature incubation was higher than the low-temperature ones for all of the samples
