why it is necessary to remove harmful substances from the sewage before it is released into the water bodies Share with your friends Share 2 Nandana Chandra answered this it is necessary to remove harmful substances from the sewage as it may harm the living organisms in the water bodies 5 View Full Answer Surbhi Shekhar answered this fast , I need it now 2 Mehal Kanoujia answered this Because the harmful substances can pollute the water and the water organisms will die 0 Aarush Pahwa answered this because it can cause water and land pollution 0