The existing water supplies could not fulfill the demand of the growing populations and industries in Łódź and Tomaszów Mazowiecki.

A section of the pipe between the water treatment plant in Kalinko and a pumping station with storage tank in Chojny has an increased diameter - 2.2 metres (7.2 ft).

The construction of a second pipeline with equal capacity was considered, but the decreasing demand from population, declining light industry and availability of other sources have made it redundant.

They offered much higher quality water and by the 1990s plans were put in place to replace the reservoir's supply with deep wells.

The dam lies at the north-eastern boundary of the reservoir and the Pilica outflow is located at 51°28′26″N 20°00′22″E / 51.473971°N 20.006138°E / 51.473971; 20.006138 in Gmina Tomaszów Mazowiecki.

[3] In addition to the water supply and energy producing functions, Sulejowski Reservoir serves as a center for recreation.

[9] The reservoir lies at the northernmost part of the Sulejów Landscape Park which is centered around the Pilica river and contains protected forests.