This diploma thesis is divided into two parts, theoretical and a part where the results are revealed. In the theoretical part the thesis is mainly focused on the characteristics of the chosen field. It then goes into further detail on the separate themes of each of the problems it is concerned with which is used in its research section. These themes are infrastructure and critical infrastructure, the description of the function of water management while also explaining the terms drinking water and water tank. The thesis also discusses solutions for a possible contamination by chemical, biological and radioactive matter. Terrorism is also discussed in the theoretical part of the thesis. The chosen methods for the evaluation of the results are quantitative and qualitative analysis on the basis of the corresponding technical documentation and business databases. The review of the safety measures used on waterworks objects and of the protection of the sources of drinking water was done through field research, during which, photo documentation was obtained and which was further analysed with varied criterion. There were important findings obtained through this research and it also pointed out the different levels of protection on water tanks in water systems in the Plzeň-North area. Detailed results are at the end of this thesis. With this thesis the author wants to point out the importance of protection of waterworks, mainly the protection of drinking water when it is distributed to its users. The failure to protect this commodity in its full extent would then have far-reaching impact, different from each other only in their extent. The most feared types of said emergency situations would be contamination or the interruption of drinking water supply. The main fields affected by these situations would be the food industry, healthcare, different branches of the industry, agriculture and many other, which are the ones ensuring optimal living conditions and safety for citizens not only in the Czech republic.

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