At one time, hand pump water was considered to be pure and used freely for drinking villages but not now . Why ?

At one time, hand pump water was considered to be pure and used freely

1.	At one time, hand pump water was considered to be pure and used freely for drinking villages but not now . Why ?
Answer» Solution :Hand pump water is GROUND water. It collects below the surface of the earth after passing through the pores of the earthy materials which ACT as a filter for it and is pure . Now due to DISPOSAL of domestic wastes and industiral effuents and use of fertilizers and pesticides, a NUMBER of harmful soluble substances dissolve into rain water and pass through the soil and enter into ground water resulting in POLLUTION.