The goal of my thesis was to show different problems regarding the supply of fresh drinking water and water used for fighting fires in the valley of Besnica. Merging previously mentioned functions on the same water-line system in small settlements can be problematic from water quality point of view due to large quantities of water being held up inside the system because of firefighter-related use . As a result, the retention of water is longer and thus the quality drops. With the use of software tool Epanet 2.0 and with different simulations I showcased these problems and with some alternatives tried to propose some solutions. The solutions provide adequate water, age-wise and for firefighter use. The choice of the right alternative rests on the compromise between the investors, future consumers and firefighter experts.