The depth profile of ³⁶Cl/Cl ratio in groundwater was investigated in the Tsukuba Upland of central Japan. The obtained results clearly show the influence of bomb-produced ³⁶Cl; the highest ³⁶Cl/Cl ratio is about one order of magnitude greater than the natural background ratio (1 × 10^-13). The vertical distribution of ³⁶Cl is consistent with previous observations using ³H and Darcy's law. From the profile, the total bomb-produced ³⁶Cl fallout in the upland is 2.3 × 10¹² atoms/m² after the correction for surface runoff (c.f. 2.4 × 10¹² atoms/m² at the Dye-3 site, Greenland) and a scaling factor of 0.96 was obtained (c.f. 2.5 based on the simplified latitudinal fallout distribution model). We then reconstructed the local fallout history of ³⁶Cl based on the Dye-3 data (scaled with a factor of 0.96 for the Tsukuba Upland) and the mean ³⁶Cl flux, produced in the atmosphere from cosmic rays and measured 30 atoms m^-2 s^-1 in the upland. The ratio of the maximum bomb-peak fallout to the average natural background flux of meteoric ³⁶Cl is consistent with that of measured data in Nepal. The result implies that the simplified latitudinal distribution model for ³⁶Cl deposition is not easily applicable for the prediction of the bomb-produced ³⁶Cl fallout pattern.