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The structure of 8-amino-2-naphthalene­sulfonic acid monohydrate (1,7-Cleve’s acid hydrate), C 10 H 9 NO 3 S·H 2 O, shows the presence of a sulfonate–aminium group zwitterion, both groups and the water mol­ecule of solvation giving cyclic  R33 (8) O—H⋯O and N—H⋯O inter­molecular hydrogen-bonding inter­actions, forming chains which extend down the  a  axis of the unit cell. Additional peripheral associations, including weak aromatic ring π–π inter­actions [centroid–centroid distance = 3.6299 (15) Å], result in a two-dimensional sheet structure.

8-Ammonionaphthalene-2-sulfonate monohydrate: the zwitterionic hydrate of 1,7-Cleve's acid