Refreshed daily by an automated ingest (/india/api/ingest/water-resources), but the upstream resource is a fixed 2020 Central Ground Water Board assessment — the daily re-fetch does not create newer history than the source publishes.
Known caveats
A ratio of two summed state totals (extraction over extractable resource), not an average of the source rows — the two pre-2020 Dadra & Nagar Haveli and Daman & Diu rows are combined this way for one correct combined figure.
A lower stage means groundwater is drawn at a more sustainable rate; a stage over 100% means more is drawn each year than nature replaces.