Water disinfection is practiced in surface water, groundwater in fissured soils, karst or poorly filtered. This study determined the efficiency of chlorination of water plants treating surface water (river Suceava) and accumulations of water. Disinfection of water may have undesirable effects by persistence in drinking water of substances used to treat it or their byproducts, such as chlorophenols or trihalomethanes (case of chlorination) that aldehydes, phenols and carboxylic acids ( treatment with ozone). The analysis results show that chlorine values depend greatly on temperature, contact time, pH and oxidisability. Like other studied parameters chlorine shows an increase in concentration for warm summer period, due to the requirement for chlorine in water. In the study in three years to monitor the chlorine was found that it tends toward a slight increase due to application of chlorine in water and rehabilitation works for the city water network. Physical-chemical quality parameters of water distributed by the two plants that treat surface water (Dragomirna and Mihoveni) were within the limits allowed under the law.
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