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In the title compound, 2Na+·C9H3NO82−·3H2O, the asymmetric unit consists of two Na+ cations, one dihydrogen pyridine-2,3,5,6-tetracarboxylate dianion (H2pdtc2−) and three water molecules coordinated to the Na+ cations. The configuration of the anion is stabilized by intramolecular O—H...O hydrogen bonding between vicinal carboxylate/carboxy groups. The Na+ cations are bridged by the H2pdtc2− dianions, generating layers extending infinitely in sheets parallel to (001), and further pillared by the water molecule linkers to build up a three-dimensional framework.