The project is conducted in the framework of the Safety Research of Needs of the State in the Years 2010 and 2015. Its goal is to establish evaluation methodology and determine the safety level of elements of the critical infrastructure, with the focus on supply of drinking water. Furthermore, it proposes general procedures reducing the risk of significant limitation or termination of the system of public water mains within the replacement and emergency water supply (NZV) during natural disasters or extensive emergencies affecting drinking water sources.