ABSTRACT: Potable water resources are one of the most important parts of the environment. That is why their protection against pollution is very discussed. Drinking water resources pollution is mostly due to leakage of contaminants into groundwater. Similarly dangerous are potential sources of contaminants occurring on surfaces close to water resources in case of floodwater events. The paper deals with some aspects of water source protection. The method of finite elements by application of the program SEFTRANS was used.