The title compound, [Cu(hpydc)(DMP)].5H₂O (2) (where H₂hpydc and DMP are 4-hydroxypyridine-2,6-dicarboxylic acid and 2,9-dimethyl-1,10-phenanthroline, respectively), was synthesized via the proton transfer method and its structure was determined by single crystal X-ray diffraction. This compound crystallizes in the monoclinic crystal system with P_2/c space group and the unit cell parameters are a = 10.8423(4), b = 13.4457(5), c = 13.6447(4) Å and β = 90.004(2)º. The final R value is 0.046 for 4425 independent reflections. The asymmetry unit of compound 2 contains one molecule of the Cu complex and five molecules of water of hydration. The Cu^II central atom in compound 2 adopt a distorted square-pyramidal coordination geometry being penta-coordinated by one N and two O atoms of 4-hydroxypyridine-2,6-dicarboxylate and two N atoms of DMP ligands. This compound is a pseudopolymorph of the previously reported compound of [Cu(hpydc)(DMP)].3H₂O, (1). Non-covalent interactions and different number of solvent molecules are responsible for the hydrophilic channels in the structure of compound 2 which have been occupied by water molecules.