3-Hydroxy-pyridinium hydrogen chloranilate monohydrate.

In the title salt hydrate, C(5)H(6)NO(+)·C(6)HCl(2)O(4) (-)·H(2)O, the three components are held together by O-H⋯O and N-H⋯O hydrogen bonds, as well as by C-H⋯O contacts, forming a double-tape structure along the c axis. Within each tape, the pyridinium ring and the chloranilate ring are almost coplanar, forming a dihedral angle of 2.35†(7)°.