Data from the Jal Dharohar Water bodies census conducted by the Department of Water Resources, River Development and Ganga Rejuvenation.
The census was conducted in 2018-19 and the data released in 2023.
Data for Kolkata district from the Household Consumption Expenditure Survey of 2022-23 by the Ministry of Statistics and Programme Implementation.
The data is for all 15 levels as published by the MoSPI