Switch thirsty crops, water by drip
Where most water goes to fields, moving from paddy and sugarcane to millets, pulses or maize, and from flood to drip or sprinkler irrigation, saves more than any recharge can add.
This area pumps out more water than rain puts back. That is the 2025 stage of groundwater extraction: water pumped out in a year as a share of what rain and other sources safely put back. Up 6 points since 2020.
Each point is one CGWB assessment. Over-exploited means more water leaves the ground than comes back, so the water table keeps falling. Hover over or tap a point to see why it moved.
| Year | Stage | Pumped out | Safe limit | Category | What changed |
|---|---|---|---|---|---|
| 2020 | 136.4% | 155 million m³ | 114 million m³ | Over-exploited | First assessment in this series. |
| 2022 | 147.3% | 158 million m³ | 107 million m³ | Over-exploited | Pumping up 2% (155 → 158 million m³). Safe limit down 5% (114 → 107 million m³). Main reason: less water soaked back in, from weaker rain, less canal seepage or more paved ground. |
| 2023 | 149.8% | 165 million m³ | 110 million m³ | Over-exploited | Pumping up 4% (158 → 165 million m³). Safe limit up 2% (107 → 110 million m³). |
| 2024 | 139.2% | 126 million m³ | 90.3 million m³ | Over-exploited | Pumping down 24% (165 → 126 million m³). Safe limit down 18% (110 → 90 million m³). Main reason: less water was pumped out, mostly for irrigation (156 → 120 million m³). |
| 2025 | 142.9% | 139 million m³ | 97.1 million m³ | Over-exploited | Pumping up 10% (126 → 139 million m³). Safe limit up 8% (90 → 97 million m³). Main reason: more water was pumped out, mostly for irrigation (120 → 134 million m³). |
Million m³: 1 million m³ = 100 crore litres. 2009 and 2013 used the older GEC-97 method.
Loading 20 years of rainfall…
Most of the water here goes to farming, so using less on fields matters as much as recharge.
Where most water goes to fields, moving from paddy and sugarcane to millets, pulses or maize, and from flood to drip or sprinkler irrigation, saves more than any recharge can add.
Parks, campuses, warehouse yards and road sides can take recharge shafts that reach past the clay layer, so runoff that floods streets goes down to the aquifer instead.
Desilting old ponds and opening their feeder channels restores natural recharge. A one-hectare pond that soaks in a metre of water over the monsoon puts back about a crore litres.
Pipe roof water through a silt trap and filter into a recharge pit or an old borewell. Every 100 m² of roof puts back tens of thousands of litres a year, right where the pumping happens.
On sloping or rocky land, small dams on seasonal streams and trenches along contours slow water down long enough for it to sink in.
Treated water from a sewage treatment plant can run flushing, gardens, cooling towers and construction, which today often draw on borewells.
In the 2025 Central Ground Water Board assessment, Tirupathur (Tamil Nadu) pumped out 143% of the groundwater that can be safely taken out each year, which puts it in the "over-exploited" category. That is 6 points higher than in 2020.
Yes. Tirupathur takes out more groundwater than rain and other sources put back, so the water table keeps falling.
Rooftop rainwater harvesting into recharge pits or old borewells, recharge shafts in open land, reviving ponds, check dams, treating and reusing wastewater, and moving farms to drip irrigation and less thirsty crops.
Yearly rain at Tirupathur, 2006–2025, from NASA satellite data. Lighter bars are dry years (20% or more below average), when wells are drawn hardest.
To stop the water table falling, Tirupathur has to put back or save 41.7 million m³ a year. At 961 mm of rain, here is what that looks like:
In practice it is a mix: recharge in towns, ponds and check dams in villages, and saving water on farms and in factories.
1 mm of rain on 1 m² is 1 litre. The surface factor allows for water lost to splash, evaporation and first-flush.