Trentabank is the uppermost of four reservoirs that collect water from the hills at the head of the River Bollin, and water from Trentabank and Ridgegate supplies Macclesfield with the town's drinking water.
The main reservoir, Trentabank, serves as a water collection point for the hills surrounding the River Bollin and, in conjunction with Ridgegate, supplies Macclesfield with its potable water.