6-(1H-Tetra-zol-5-yl)-1H-indole monohydrate

In the title compound, C(9)H(7)N(5)·H(2)O, the tetra-zole ring forms a dihedral angle of 1.82 (1)° with the mean plane of the indole fragment. In the crystal, mol-ecules are linked by inter-molecular O-H⋯N, N-H⋯O and N-H⋯N hydrogen bonds into a two-dimensional network parallel to (100). Addtional stabilization is provide by weak π-π inter-actions with a centroid-centroid distance of 3.698 (2) Å.