Tinsukia, one of the 33 administrative districts in the state of Assam is located in the upper part of Assam. The district lies between Latitudes 27.962502 N and 27.229162 N and Longitudes; 95.217562 E and 96.019842 E., occupying south-eastern part of the north-east India. The district physiographically divided into four distinct parts i.e. (i) the flood plains (ii) younger and older alluvium plains (iii) the terrace deposit at the foothills in the south and south eastern parts and (iv) Hillocks of the tertiary groups in the south and south western side. The topography is generally flat with a gentle slope toward north. The gradient plain is relatively steeper in the northern part of the district immediately below the foothill of the Himalayas. Top clay layer followed by sandy layer with a thickness of 15 to 45 m occurs down to a depth of 50 m below ground level in most part of the district but in flood plain area, top clay layer is encountered with occasional silt down to a depth of 50 m. Zones extending below 50 m depth are considered deeper aquifer. Central Ground Water Board drilled five tube wells at Hapjan, Margherita, Philobari, Borgolai and Chapakhowa. The wells drilled by State organisations at Nunpuria, Loina, Tingrai, Dhala Khola and Buridihing. Lithological sections and panel diagram prepared on the basis of lithological logs of deep tube wells. It is seen that in the northern part of the district, sand is dominant.