The document discusses a study on water availability and groundwater levels in Tamil Nadu, India with reference to the 6th UN Sustainable Development Goal. It analyzes data on water-borne diseases from 1998 to 2019, showing a decline in cases and deaths. Groundwater levels were forecasted from 2013 to 2020 using the aquifer-atlas method, with some differences between actual and predicted levels. Comparison of Tamil Nadu's performance on the 6th SDG between 2018 and 2019 showed improvements in various water and sanitation indicators. The study concludes that while water-borne diseases are decreasing with improved water quality, groundwater levels remain stable but with increased salinity.