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This study determined and monitored the halogenated disinfection by-products (DBP) of natural waters used to produce drinking water for the City of Casablanca, Morocco. The natural water physicochemical parameters were first monitored to characterize these waters; chlorine requirements were determined by plotting the break point curve. Then waters were synthesized in a laboratory, based on the results of previous analyses. The break point curves of these synthetic waters were also determined. To assess the consequences of chlorination, monitoring tests determined the trihalomethane (THM) and the halogenated organic compounds (COX) out before and after coagulation. Results for natural waters showed a correlation between total organic carbon (TOC), the THM contents and type as well as the COX formed following chlorination. Results thus showed that coagulation before chlorination helped reduce the formation of disinfection by-products. [ABSTRACT FROM AUTHOR]