In the title complex, [Cu(CH3COO)Cl(C16H14N4)]·H2O, the CuII ion is five-coordinated by two N atoms from a 2,2′-(ethane-1,2-diyl)di-1H-benzimidazole ligand, two O atoms from a chelating acetate ligand and one terminal monodentate Cl atom in a distorted square-pyramidal geometry. In the crystal, adjacent molecules are linked through O—H⋯Cl, N—H⋯Cl, N—H⋯O and O—H⋯O hydrogen bonds into a three-dimensional network
