Problems with the lack of drinking water in the Ipľa region began to be felt in 1977. The solution was the construction of the Málinec waterworks, which they started to implement on 1 April 1986. The tank was put into operation in 1994 and now the cities of Fiľakovo are supplied with drinking water. Lučenec and Veľký Krtíš. In the flooded area completely disappeared settlement Hamor, but also the surrounding settlements Hrozinovo, Chmelná, Šťavica. The work itself consists of its own water reservoir on the upper Ipľa river and water treatment plant. The dam height is 53 meters and the total reservoir volume is over 26 million cubic meters.
It is interesting that the river Ipeľ has all 12 tributaries in the Málinca cadastre from the right bank. The tributaries of Chocholná and Smolná are so extensive that they are almost equivalent to the Ipeľ River. It was the resource yield that was decisive in the selection of the building for the drinking water supply in Málinec.