Replying to a question, Minister of State for Water Resources Santosh Kumar Gangwar said the comparison of ground water data, as monitored by the Central Ground Water Board, for the pre-monsoon 2013 with decadal mean of the monsoon (2003-2012) indicates that 56 per cent of the wells show a decline in ground water level.
"As per the latest assessment (2011), out of 6,607 assessment units (blocks/mandala/talukas/districts) in the country, 1,071 units falling in 15 states and 2 Union Territories have been categorised as 'over-exploited', based inter-alia, on declining ground water level," he said.