The structure determination of the title compound, (I), a copper complex with two 4-sulfamoylbenzoate (SB) anions and two nicotinamide (NA) ligands and one coordinated water mol­ecule, was undertaken in order to compare the results obtained with those reported previously. In this context, we synthesized the CuII-containing title compound, aqua­bis(nicotinamide-κN)bis­(4-sulfamoylbenzoato-κO1)copper(II), [Cu(C7H6NO4S)2(C6H6N2O)2(H2O)], and report herein its crystal and mol­ecular structures along with the Hirshfeld surface analysis.