Groundwater in areas falling in the northern coastal region of East Coast Road has been growing saline over the past few years.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/groundwater-along-ecr-turning-saline-study
[2] http://admin.indiaenvironmentportal.org.in/category/author/k-lakshmi
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-chennai
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tamil-nadu
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/groundwater
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/urbanisation
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/drinking-water
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/total-dissolved-solids
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-resources