In the title compound, [Cu(C7H6N2O3)(C6H8N2)(H2O)], the CuII ion is in a distorted square-pyramidal N3O2 environment formed by two bidentate chelating ligands in the equatorial coordination sites and one water molecule in the apical direction. In the crystal, O—H⋯O, N—H⋯O and O—H⋯N hydrogen bonds link the complex molecules into a three-dimensional supramolecular network.