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
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.