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.
Groundwater level in Chengalpattu
64%Safe
Groundwater use is within safe limits here. 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. Down 7 points since 2020.
404 million m³pumped out each year (2025)
628 million m³can be taken out safely each year
Noneno yearly shortfall
97%goes to irrigation; the rest to homes and industry
Extraction 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.
Safe · up to 70%Semi-critical · 70–90%Critical · 90–100%Over-exploited · above 100%
Show the numbers
| Year | Stage | Pumped out | Safe limit | Category | What changed |
|---|---|---|---|---|---|
| 2020 | 71.6% | 344 million m³ | 480 million m³ | Semi-critical | First assessment in this series. |
| 2022 | 67.9% | 357 million m³ | 526 million m³ | Safe | Pumping up 4% (344 → 357 million m³). Safe limit up 10% (480 → 526 million m³). Main reason: more water soaked back into the ground, from better rain, canals or recharge structures. |
| 2023 | 71.8% | 381 million m³ | 531 million m³ | Semi-critical | Pumping up 7% (357 → 381 million m³). Safe limit up 1% (526 → 531 million m³). Main reason: more water was pumped out, mostly for irrigation (345 → 370 million m³). |
| 2024 | 68.3% | 386 million m³ | 566 million m³ | Safe | Pumping up 1% (381 → 386 million m³). Safe limit up 7% (531 → 566 million m³). Main reason: more water soaked back into the ground, from better rain, canals or recharge structures. |
| 2025 | 64.2% | 404 million m³ | 628 million m³ | Safe | Pumping up 4% (386 → 404 million m³). Safe limit up 11% (566 → 628 million m³). Main reason: more water soaked back into the ground, from better rain, canals or recharge structures. |
Million m³: 1 million m³ = 100 crore litres. 2009 and 2013 used the older GEC-97 method.
Loading 20 years of rainfall…
What will fix it here
Groundwater here is in balance. Keeping it that way means recharging as the area builds up and paves over.
Revive village ponds and johads
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.
Rooftop rainwater recharge
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.
Recharge pits and shafts in open land
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.
Check dams and contour trenches
On sloping or rocky land, small dams on seasonal streams and trenches along contours slow water down long enough for it to sink in.
Treat and reuse wastewater
Treated water from a sewage treatment plant can run flushing, gardens, cooling towers and construction, which today often draw on borewells.
Frequently asked questions
What is the groundwater level in Chengalpattu?
In the 2025 Central Ground Water Board assessment, Chengalpattu (Tamil Nadu) pumped out 64% of the groundwater that can be safely taken out each year, which puts it in the "safe" category. That is 7 points lower than in 2020.
Is groundwater in Chengalpattu over-exploited?
No. At 64% of the safe yield, Chengalpattu is safe, though recharge is still needed as demand grows.
How can groundwater be recharged in Chengalpattu?
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.
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