1-Carboxy-2-hydroxypropan-1-aminium 4-methylbenzenesulfonate monohydrate

In the title hydrated salt, C4H10NO3+·C7H7O3S−·H2O, an intramolecular C—H...O hydrogen bond in the cation generates an S(6) loop. In the crystal, carboxyl-O—H...O(sulfonate), hydroxyl-O—H...O(sulfonate), water-O—H...O(sulfonate, hydroxyl) and ammonium-N—H...O(water, carbonyl) hydrogen bonds link the components of the asymmetric unit into supramolecular layers parallel to (001).