The topic of the thesis is assessment of the sewer system in chosen part of urbanized complex, village Divišov situated in central bohemian region. It was issued directive by European Council Directive, called 91/271/European Economic Community. This directive deals with treating of urban waste water. It gives rules to drain waste water outflow into the water collection system for following suitable treating. This rule affects municipalities with over than 2000 equivalent inhabitants. It was made the survey of interest municipality and was determined the volume of defects in local sewer system. Thanks to institute of Water Management was also used assessment methodology of sewer system technical condition. For the most defected parts of system was executed the CCTV survey. In this thesis is also written about the assessment of chosen sections in examined sewer system, this evaluation was made in programm DrainURB, which is specialized for calculation of parameters in sewer system and also for determination of volume flow balances. After the assessment of whole survey was made suggestion for technical measure or was formulated new project documentation of new designed sewer system.