As a part of regular activity of ground water regime monitoring, Central Ground Water Board under Ministry of Water Resources carries out chemical analysis of ground water samples once a year. These samples are collected from the network of ground water monitoring wells during pre-monsoon period (April/May). As per the latest chemical quality data available with CGWB, out of 451 samples spread over all the districts of Tamil Nadu, high Chloride (>1000 mg/l) was encountered at 38 locations.
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Links:
[1] http://admin.indiaenvironmentportal.org.in/reports-documents/contamination-ground-water-tamil-nadu
[2] http://admin.indiaenvironmentportal.org.in/category/publisher/press-information-bureau
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/groundwater-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tamil-nadu
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/groundwater-quality
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/central-groundwater-board-cgwb
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/parliament
