In the title hydrated salt, (C10H10N2)[SnF2Cl4]·H2O, the dihedral angle between the pyridinium rings in the cation is 40.5 (4)° and the F atoms in the octa-hedral complex anion have a cis disposition [F-Sn-F = 85.32 (17)°]. In the extended structure, altern... ...