Groundwater discharge, temperature, and electrical conductivity of an artesian well were measured at Nishiawakura, Okayama Prefecture, southwest, Japan. The discharge ranged from 2¿10-4 to 5¿10-4 m3/s showed tidal fluctuations of about 5¿10-5 m3/s induced by strain. Although the groundwater temperature reflected the same tidal fluctuations as the discharge, the electrical conductivity did not manifest tidal fluctuations. The discharge slightly leads the theoretical tidal strain, and its response to the strain of the diurnal constituents is different from that of the semidiurnal constituents. The discharge fluctuations induced by atmospheric loading also have some frequency dependence. These can be explained by the vertical or horizontal groundwater flow (leakage) from the aquifer which has been used in the explanation of the well water level fluctuations induced by tidal strain and atmospheric loading. ¿American Geophysical Union 1993