Abstract
The Karnataka state's Kolar Region, which is in the drought - prone agroclimatic zone, experiences less than normal rain fall during monsoon rainy season and it does not have any major dams or canals, main occupation of people is agrochemical based agriculture and is mainly dependent on groundwater for domestic, agriculture and livestock, Hence quality of water is important. The key factors used to assess the quality of water are its various physico-chemical characteristics. Among them nitrate (No3) is common anion that contaminates groundwater. The present study focuses on the examination with nitrate concentration into groundwater samples drawn on 50 different borewells of various villages of Kolar District. The result shown that the nitrate level in some samples higher than acceptance level, similarly in some samples shown below the acceptance level. Increased nitrate levels are typically a sign of pollution
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