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The asymmetric unit of the title compound, C8H8O4·H2O, contains two organic molecules which are connected by the two water molecules through O—H...O hydrogen bonds, forming an R44(12) ring. Further O—H...O hydrogen bonds assemble these rings through R66(18) rings, giving rise to infinite helical chains arranged around the b axis. These helical chains are assembled by offset π–π stacking interactions [centroid–centroid distance = 3.6432 (8) Å] between the aromatic rings of neigboring chains, forming a supramolecular network.