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The title compound, (C13H10N)2[Co(C6H2N2O4)2(H2O)2]·6H2O, consists of mononuclear trans-[Co(pz-2,3-dc)2(H2O)2]2− complex anions, (acrH)+ cations and uncoordinated water molecules (acr is acridine and pz-2,3-dcH2 is pyrazine-2,3-dicarboxylic acid). The CoII atom, which lies on a crystallographic center of symmetry, has a slightly distorted octahedral coordination environment, with two N and two O atoms from the (pz-2,3-dc)2− ligands in the equatorial plane and with two water molecules in axial positions. In the crystal, the components are held together by two distinct N—H...O and C—H...O hydrogen bonds with R22(8) graph-sets. The coordinated and uncoordinated water molecules are also involved in O—H...O hydrogen bonds, which lead to the formation of layers with R33(12) graph-set motifs. Extensive π–π stacking interactions between parallel aromatic rings of the acridinium ions, with distances ranging from 3.533 (1) to 3.613 (1) Å, occur in the structure.