Abstract: The invention is a water well surge block for agitation of particles in water wells. The surge block utilizes a novel one way valve comprising a shaft in connection with a rigid perforated cylinder having an upper and lower surface and a flexible membrane that overlies the upper surface of the membrane. As the surge block moves downward in the well or wellbore the membrane flexes away from said cylinder during downward movement of the block in order to permit the one way flow of fluid upward. The membrane closes against the cylinder to prevent the flow of water as the block moves upward.