This study presents the coordination modes and two-dimensional network of a novel strontium(II) coordination polymer, [Sr(C(7)H(5)O(5)S)(2)(H(2)O)(3)](n). The eight-coordinate Sr(2+) ion is in a distorted bis-disphenoidal coordination environment, surrounded by four sulfonate and one carboxyl O atom from five benzenesulfonate ligands, two of which are symmetry unique, and by three O atoms from three independent aqua ligands. The compound exhibits a monolayer structure with coordination bonds within and hydrogen bonds between the layers. The mu(4) acid ligand bridges the metal ions in two dimensions to form a thick undulating monolayer with a hydrophobic interior and hydrophilic surfaces. A second independent monoanion is arranged outward from both sides of the monolayer and serves to link adjacent monolayers via carboxyl-water and water-carboxyl hydrogen bonds.