By use of the Los Alamos transport code, a parametric set of criticality conditions for one-dimensional geometries of light water solutions of the fissionable materials U233, U235, and Pu239 has been determined. Minimum critical dimensions for slabs and cylinders and critical radius, mass, and volume for spheres as a function of solution concentrations (kg/1) and H/X atomic ratio are shown for bare and light water reflected solutions. Results of experimental studies for critical dimensions are given to support the study.