The aim of this publication is to study realization of aggressiveness of water in engineering geological and geotechnical practice. Determination of water aggressiveness is important for the knowledge of effect of concrete and steel. In the case that water is aggressive to concrete, located in the foundation structure, can be disturbed statics of the building or other malfunctions. Similar problems may occur in the case of steel elements. Moreover, various pipelines are steel pipes, which can be accelerated corrosion damaged. Determination of aggressiveness is thus one of the important goals engineering geological and geotechnical survey.