Abstract: The artesian aquifers show elastic response to alternate loading and unloading of short duration. Astudy has been carried out in order to investigate the effects of loading ofi long duration an<} continuous discharge fromthe aquifer on the elasticity of the aquifer. The artesian aquifer, underlain by Pineview reservoir, in the State of Utah(U.S.A.), has been selected for this purpose. In this study.the long term reservoir level measurements and the waterlevel measurements taken from the observation wells were compared and evaluated. As a conclusion, under the conditions of loading of long duration and continuous discharge, a slight reduction in the aquifer elasticity and thus a permanent deformation in the skeleton of the aquifer has been observed. This deformation causes a reduction in the yield ofthe aquifer.