Abstract: As a developing country, protecting groundwater resources is extremely essential in Sri Lanka. Landfills are one of the main sources of water pollution. The filling of the Gohagoda disposal yard, takes place at a distance about 50m from Gohagoda water intake plant. In addition, there is several boreholes located close proximity of the landfill, which used for drinking and domestic purposes. A study of composition of landfill leachate and groundwater pollution conducted at Gohagoda landfill site, which is located at north-west of Kandy city. The Leachate sampled at nine different locations of the landfill. Groundwater samples were collected using auguring at five locations.