(i) Agricultural wastes : Fertilizers and Pesticides run down into the water bodies.
Nitrates and phosphates contaminate water and cause undesirable effect.
Cattle waste, animal carcasses are carried down by rivers and pollute them.
(ii) Biomedical waste: Generated in hospitals, clinics and pathological laboratories.
Pathology: organs, tissues, blood, urine, Infections: needled, syringes, etc. contaminated with disease causing bacteria, outdated drugs and chemicals.etc.
(iii) Radioactive waste: Generated in nuclear fuel cycle, testing weapons, naturally occurring radioactive metals.