The bis-(benzimidazol-1-yl)methane mol-ecule of the title compound, C(15)H(12)N(4)·2H(2)O, displays a trans conformation with a twofold axis running through the methylene C atom. Two adjacent water mol-ecules are bonded to this mol-ecule through O-H⋯N hydrogen bonds, forming a trimer. Adjacent trimers are connected together via C-H⋯O inter-actions, forming a chain running along the b-axis direction. Two such chains are joined together via π-π inter-actions [centroid-centroid distance = 3.556 (2) Å], forming double chains, which are connected via the water mol-ecules through C-H⋯O associations, forming a sheet structure. The sheets are stacked on top of each other along the a-axis direction and connected through O-H⋯O and C-H⋯O inter-actions, forming a three-dimensional ABAB layer network structure.