Ground water is the major source of drinking water in both rural and urban areas which may be contaminated by various means, Arsenic is one of them. 8928 hand-pump samples (250ml water sample from each) from 20 different blocks of Samastipur district, Bihar were collected in sterile containers and Arsenic was analyzed. Out of 20 blocks, 4 blocks i.e., Vidyapatinagar, Patori, Mohiuddinagar, and Mohanpur handpumps water had arsenic contamination i.e., 29.5ppb, 33.7ppb, 56.6ppb and 60.4 ppb respectively. According to SDWA (1996) the maximum permissible limits of arsenic in drinking water is 10 ppb. This research paper highlights the areas which were affected by arsenic contamination and beware the public & Bihar Government.