The method of dilatancy blasting in rock mass surrounding water-wells - new ones or long-term exploited has been introduced. In many cases of water wells there is a possibility of carrying out the well's reconstruction to get productivity increase. The one of the methods is dilatancy blasting with the help of special prepared torpedo. That method uses the effect of explosion wave acting on well's elements and surrounding rock mass. Some physical basis and methodology have been described in the paper. The dilatancy effect used in the method is based on the physical process going to produce some cracks in rock mass. The essential use of blasting technique is focused to get the field of shear stresses in the direction of discontinues or weak zones. It causes that the increase of permeability in surrounding rock mass is achieved. Usually, rock mass properties changes are observed in the distance of 70-80 times well's radius. It uses to expect 2.5-3 times more in productivity. In the text some advantages and limitations of the method were underlined comparing to other methods. The most of experience in using the method have been gathered from a few tens of wells placed on the territory of Ukraine and also Russia. Lithuania and China. The possibilities of using this method in Polish conditions have been pointed too.