# Water crisis and contamination in Tamil Nadu

> Live situation record from CLSTR: https://clstr.news/situations/water-crisis-and-contamination-in-tamil-nadu
> Updated: 2026-10-03T03:01:30.000Z. Sources: 4. Developments: 2.

Tamil Nadu is experiencing a multifaceted water crisis involving both quality degradation and severe scarcity. A study by the Vellore Institute of Technology revealed that nearly one-third of groundwater samples in Chennai are unsuitable for drinking. In areas like Taramani, the Water Quality Index reached nearly 700, more than double the safety threshold, due to seawater intrusion, sewage ingress, and heavy extraction.

Compounding these quality issues, the state is facing critical shortages as reservoir storage and groundwater levels drop due to rainfall deficits. Approximately 63 of the state’s 90 reservoirs are holding less than 25% capacity, a significant decline from the previous year. In Chennai’s suburban areas, residents relying on borewells are seeing water tables fall between 300 and 700 feet, leaving the region heavily dependent on the upcoming northeast monsoon for replenishment.

## Timeline

### 2026-10-03: Tamil Nadu faces critical water shortages as reservoirs and groundwater levels drop

Tamil Nadu faces critical water shortages as 63 of its 90 reservoirs hold less than 25% capacity and groundwater levels in Chennai's suburbs drop to dangerous depths.

2 sources. https://clstr.news/cluster/tamil-nadu-faces-critical-water-shortages-as-reservoirs-and-groundwater-levels-drop

### 2026-09-15: Chennai groundwater study finds one-third of samples unsafe

A study reveals that one-third of groundwater samples in Chennai are unsuitable for drinking, with Taramani showing extreme degradation due to seawater intrusion and sewage ingress.

2 sources. https://clstr.news/cluster/chennai-groundwater-study-finds-one-third-of-samples-unsafe

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Cite as: Water crisis and contamination in Tamil Nadu. CLSTR, https://clstr.news/situations/water-crisis-and-contamination-in-tamil-nadu