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In the title compound, [Ni(C9H4O6)(H2O)3]n, the NiII ion has a distorted NiO5 square-pyramidal geometry, the maximum deviation from the least-squares plane formed by the basal atoms being 0.9351 (13) Å. The basal plane is formed by two O atoms from carboxylate residues of the 5-carboxybenzene-1,3-dicarboxylate ligand and by two O atoms from water molecules. The O atom of the third water molecule is axially positioned, 1.7890 (19) Å perpendicular to the basal plane. The 5-carboxybenzene-1,3-dicarboxylate ligand bridges the metal atoms, forming a polymeric chain along the b axis. O—H...O hydrogen bonds between the water molecules and carboxylate groups stabilize the crystal structure.