Heavy metal pollution Eutrophication 2 Oil pollution 2 Bioaccumulation 1 Biomagnification 1 Biphenyles 1 Mercury pollution 1 Metal pollution 1 Noise pollution 1 Pathogens, Water borne 1 Pollution 1 Polychlorinated Biphenyles 1 Radio active pollution 1 Radioactive pollution 1 Sewage 1 Soil pollution 1 Standards, water quality 1 Waste water treatment 1 Water quality standards 1 Xenobiotics 1