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The asymmetric unit of the title compound, {[Tb(C8H2NO6)(H2O)3]·H2O}n, contains one TbIII ion, one pyridine-2,4,6-tricarboxylate (ptc) anion, three aqua ligands and one lattice water molecule. The TbIII ion is nine coordinated by one N and five O atoms from three ptc ligands and by three O atoms from the three aqua ligands in a distorted bicapped trigonal–prismatic geometry. The ptc ligands bridge the TbIII ions into a two-dimensional polymeric framework parallel to (100). An extensive O—H...O hydrogen-bonding network consolidates the crystal packing.