Water uptake experiments were carried out to analyse the amount of water that the membranes absorb when immersed in water as well as their integrity after swelling. Membrane-water interaction is key for the performance of these membranes for aqueous electrodialysis applications. The water uptake of the membranes provides percolation pathways for water-molecule-assisted ionic transport. However, at the same time, water can be detrimental to the mechanical stability and integrity of the membrane and can also affect the selectivity. It has been reported that excessive water uptake (>100%) can also limit the maximum concentration of the produced acid or base solution, depending on the chemical composition of the leachate, due to increased osmosis. On the contrary, low water uptake can also increase the membrane resistance resulting in higher energy consumption.