[N,N′-bis(2′-pyridinecarboxamido)-1,3-propane] - nickel(II) monohydrate, C15H16N4O3Ni is monoclinic, space group P21/c, with a = 7.174(4), b = 18.590(3), c = 11.641(5) Å, β = 110.69(2)°, Z = 4. The structure was refined to R = 0.030 for 1826 diffractometer data using full-matrix least-squares methods. The N4-ligand coordinates to the nickel atom in an irregular square plane [average Ni-Namide 1.864(4), Ni-Npyridine 1.912(3) Å and Namide-Ni-Namide 96.0(1), Npyridine-Ni-Npyridine 98.7(1)°] with a tetrahedral twist of 15.9° at the nickel atom. The two picolinamide units are related by an approximate two-fold axis and the enforced strain in the molecule results in significant non-planar distortions in the amide chelate rings and the pyridyl rings. The plane of the chelate molecule lies approximately perpendicular to  and the lattice water molecule hydrogen bonds amide oxygen atoms to form chains parallel to .