Abstract: This paper is a collation and compilation of the research papers pertaining to the heavy metal contents in irrigation water used for agricultural purpose. The uptake of heavy metal by plants through contaminated soil gets accumulated and is a potential threat to animal and human health. The heavy metals in water bodies damage the aquatic organisms and fishes. Excess use of fertilizers and pesticides in agricultural activities to enhance productivity due to rapid population increase and development of technology threaten the groundwater and surface water on a large scale. This shows there is an obvious risk for human in the future. The pesticides used in crop cultivation should be free from heavy metals. Hence this study concentrates on effects of heavy metals present in irrigation water.