Accelerated soil pollution that has been taking place in India during the last few decades has created environmental complexities including soil. Soil pollution adversely affects the vegetation in urban and peri-urban areas. In the past, soil research focused largely on agricultural soils but now increased research interest is being observed in urban soils too because of the significant increase of the urban population. Undisturbed or partially disturbed urban soils are indicator of environmental perturbations which are responsible for altering soil profile characteristics. Soil properties that are subject to change over relatively short time periods can be a result of natural process and pollutant deposition. The Arsenic contamination in soils of Bihar is a serious threat to human being as well as to soil flora and fauna. Study reveals that the Arsenic contamination in soils of Bihar is mainly due to excessive and irrational exploitation of Arsenic contaminated groundwater. Besides this anthropogenic activity, some geogenic activities are also responsible for Arsenic contamination in soils.