Melaminium iodide monohydrate

In the title melaminium salt, 2,4,6-triamino-1,3,5-triazin-1-ium iodide monohydrate, C(3)H(7)N(6) (+)·I(-)·H(2)O, the components are linked via N-H⋯O, N-H⋯N, O-H⋯I and N-H⋯I hydrogen bonds. All of the H atoms of the melaminium cation are involved in hydrogen bonds. The melaminium cations are inter-connected by four N-H⋯N hydrogen bonds, forming ribbons along [111]. The water mol-ecules connected by N-H⋯O hydrogen bonds also form part of these ribbons. The ribbons are inter-connected by other hydrogen bonds (O-H⋯I and N-H⋯I), as well as by π-π inter-actions [centroid-centroid distance = 3.6597 (17) Å].