In the title compound, [Fe(C(9)H(6)N(3)O(3)S)(2)(H(2)O)(4)] or [Fe(POA)(2)(H(2)O)(4)], the Fe(II) atom is located on an inversion center and is ligated by four O atoms of coordinated water mol-ecules in the equatorial plane while two POA ligands acting as monodentate ligands occupy the axial positions through their pyridyl N atoms, completing a slightly distorted octa-hedral coordination geometry. A three-dimensional supra-molecular network is formed by multiple O-H⋯O hydrogen-bonding inter-actions between the coordinated water donors and the uncoordinated carboxyl acceptors.