Poly[tri-μ(2)-aqua-(μ(3)-pyridine-2,4-dicarboxyl-ato-κN,O:O:O)barium].

In the polymeric title compound, [Ba(C7H3NO4)(H2O)3]n, the BaII ion is ten-coordinated in an NO9 environment by one N atom and three O atoms from three pyridine-2,4-dicarboxyl­ate (pydc) ligands and six water mol­ecules. The μ3-pydc ligands and the bridging water mol­ecules connect the Ba atoms into a layer parallel to (100). The crystal packing is stabilized by O—H⋯O and C—H⋯O hydrogen bonds.