Why in the News
Tamil Nadu ranks third on NITI Aayog’s Investment Friendliness Index (IFI), but the index flags inadequate industrial water supply in its landlocked and rain shadow districts. The State holds only 3% of India’s water resources, so its industrial growth now depends on how it prices, governs and reuses water.
What is Tamil Nadu’s industrial water challenge?
- What it is: The State’s economy has outgrown its water reserves, so new factories compete for water that is already scarce. It is like a household whose spending has outgrown its income.
- Rain shadow location: Much of the State lies in the rain shadow of the Western Ghats, the drier side of the range. Average annual rainfall is 960 mm.
- Rising demand: Industrial water demand is projected to grow by over a quarter between 2001 and 2050.
- Effect on factories: Water scarcity disrupts production, raises operating costs and makes wastewater management difficult for textile, automobile and power units.
- The takeaway: Water supply, not skills or policy, can now limit the State’s next round of investment.
How strong is the State’s investment record, and what gaps does the index flag?
- The index: The IFI, released in July 2026, is a first of its kind report on States’ readiness to attract and sustain investment. Only Gujarat and Maharashtra rank above Tamil Nadu.
- Three gaps: The index flags limited international air connectivity, infrastructure constraints at Chennai Port and inadequate industrial water supply.
- Foreign investment: The State’s Foreign Direct Investment (FDI) inflows peaked at $3.681 billion in 2024-25, even as national FDI had declined.
- Industrial base: The State hosts 130 Global Fortune 500 companies across 110 industrial parks.
How stressed are the State’s water sources?
- Surface water: Surface water potential is 853 TMC (thousand million cubic feet). It is spread unevenly across reservoirs, tanks and upstream flows.
- Groundwater overall: A 2025 assessment by the Central Ground Water Board (CGWB) and the State found extraction at about 73.5% of the extractable resource.
- Over exploited districts: The average hides local stress. Salem, Vellore and Chennai are classified as over exploited.
- Critical districts: Krishnagiri and Coimbatore are in the critical category, with extraction approaching 90% to 100%.
How do pollution and water costs shape investment decisions?
- River pollution: Western Tamil Nadu is an industrial centre with polluted rivers. In June 2026, 28 industries received closure orders under the Water (Prevention and Control of Pollution) Act, 1974.
- Shared responsibility: Industries are accountable for the effluent (factory wastewater) they discharge, but polluted water bodies undermine the investments the State seeks.
- Zero liquid discharge (ZLD): A ZLD plant treats and reuses its wastewater, and recovers up to 90% of the water required. Eg. Textile clusters in Tiruppur.
- Limits of recycling: Tiruppur’s clusters still face freshwater shortages, and smaller units cannot bear the recycling costs.
- Investor behaviour: Royal Enfield’s first expansion outside Tamil Nadu since 1955 went to Rayalaseema in Andhra Pradesh, also a rain shadow region. Investors consider environmental risks.
Challenges
- Budget cut: The Water Resources Department’s allocation has been cut by 8.06% to ₹9,264 crore.
- Repealed groundwater law: The Tamil Nadu Groundwater (Development and Management) Act was repealed in 2013, leaving no legal framework since.
- Pending Bill: The Tamil Nadu Water Resources (Regulation, Management and Augmentation) Bill, 2026 has been passed and awaits the Governor’s assent.
- Climate variability: Erratic water cycles and El Niño make water availability uncertain.
Way Forward
- Availability based pricing: The State should price industrial water by local availability, as an investment in water security and not a penalty.
- Green energy for recycling: Linking green energy with ZLD, desalination and sewage treatment can make them affordable for industry.
- Water in investment planning: The State should treat water as infrastructure to be built and paid for with every industrial project.
- Prudent consumption: Industries should reduce the water they use for each unit of output.
Conclusion
Tamil Nadu’s investment appeal now rests on water that is unevenly available and weakly regulated. The Governor’s decision on the pending water Bill will show whether water governance keeps pace with industry.
Key numbers
- Industrial water demand: 1,555 MCM (million cubic metres) in 2001, projected at 1,985 MCM by 2050.
- Groundwater, 2025: Annual recharge 22.61 BCM (billion cubic metres), extractable resource 20.46 BCM, extraction 15.04 BCM.
- Runoff to the sea: 177.12 TMC a year on average, from 17 major river basins.
- Water budget: ₹10,076 crore in the Interim Budget, before the cut.
- Special Economic Zones: Over 42 in the State.
Matching Previous Year Question
“[2015, GS1, 12 marks] India is well endowed with fresh water resources. Critically examine why it still suffers from water scarcity.”
