The aim of the present study is to know the effects of the magnetic field on water purification. Samples were collected from tap water of Faculty of Science, Zagazig University, Zagazig, Egypt, and then treated using the magnetic field. Water was exposed to a weak static magnetic field (MF) generated from a stack of magnets (B = 18 G). After this treatment, the physico-chemical parameters of water were measured, as well as the heavy metal concentrations. The results showed that the magnetic field has a very great effect on physico-chemical parameters of the water , as
it decreases its concentrations in water samples. The magnetic field with an intensity of 18 G has a very great effect on water purification, but it is not recommended to use it in treating water pollution without sufficient studies on its safety on the living organisms live in and drinking it.