Context: NITI Aayog’s Investment Friendliness Index (IFI), July 2026 ranked Tamil Nadu third, after Gujarat and Maharashtra, assessing States’ readiness to attract and sustain investments.
- Key constraints identified: Limited international air connectivity, Chennai Port infrastructure bottlenecks and inadequate industrial water supply in landlocked and rain-shadow districts.
- The challenge is to sustain industrial expansion without compromising water security.
Tamil Nadu’s Industrial Strength
- Industrial base: Home to 130 Global Fortune 500 companies, 110 industrial parks and over 42 operational Special Economic Zones (SEZs).
- Investment attractiveness: Supported by a skilled workforce, manufacturing base, enterprise-friendly policies and natural resources.
- Foreign Direct Investment (FDI): Despite India's FDI decline from $46.03 billion (2022-23) to $44.42 billion (2023-24), Tamil Nadu's FDI inflows increased, reaching $3.681 billion in 2024-25.
- Industrial expansion contributes to employment generation, manufacturing growth and economic development.
Tamil Nadu’s Water Constraints
- Geographical limitations: Much of the State lies in the rain-shadow region of the Western Ghats, receiving an average annual rainfall of around 960 mm and accounting for only 3% of India's water resources.
- Surface water resources: Estimated potential of 853 TMC (Thousand Million Cubic Feet); average runoff to the sea is 177.12 TMC across 17 major river basins.
- Cauvery river: Decadal discharge during 2011–2021 was 4.352 billion cubic metres (BCM).
- Groundwater status (2025): Joint assessment by the Central Ground Water Board (CGWB) and State Water Resources Department:
- Annual groundwater recharge: 22.61 BCM.
- Annual extractable groundwater resource: 20.46 BCM.
- Groundwater extraction: 15.04 BCM (73.5% of extractable resources).
- Regional groundwater stress: State averages conceal localised over-exploitation:
- Over-exploited: Salem, Vellore and Chennai.
- Critical: Krishnagiri and Coimbatore, with extraction approaching 90–100%.
- Rising industrial demand: Industrial water demand is projected to increase from 1,555 MCM (2001) to 1,985 MCM by 2050.
Implications of Industrial Water Scarcity
- Industrial production: Water shortages can disrupt manufacturing, increase operational costs and affect production continuity.
- Water-intensive sectors: Textile manufacturing, automobiles and power generation are particularly vulnerable.
- Wastewater management: Scarcity and inadequate treatment infrastructure complicate sewage and industrial wastewater management, especially in drought-prone and landlocked districts.
- Investment competitiveness: Inadequate water infrastructure, recycling and groundwater management may discourage future investments and constrain industrial expansion.
Strategies for Sustainable Industrial Water Management
- Water pricing: Introduce industrial water pricing based on local water availability to encourage efficient consumption and reflect regional water stress.
- Pollution control: Industrial effluent discharge threatens rivers and water bodies, particularly in western Tamil Nadu. In June 2026, 28 industries received closure orders under the Water (Prevention and Control of Pollution) Act, 1974.
- Shared responsibility: Industries must prevent untreated effluent discharge, while the government must ensure effective wastewater treatment and restoration of polluted water bodies.
- Zero Liquid Discharge (ZLD): Enables recovery of up to 90% of water used by industries. Tiruppur's textile clusters provide an example of its application, although freshwater shortages and high implementation costs remain challenges for smaller units.
- Green energy integration: Combining renewable energy with ZLD, desalination and sewage treatment can reduce operational costs and improve sustainability.
- Integrated investment planning: Water availability and environmental risks must be considered while selecting industrial locations and approving new investments.
Industrial Development and Water Security: A Case Study
- Rayalaseema region, Andhra Pradesh: A rain-shadow region of the Deccan Plateau has emerged as an investment destination following significant transformation over the last decade.
- Royal Enfield: Its first expansion outside Tamil Nadu since 1955 was undertaken in Rayalaseema.
- Significance: Demonstrates that industrial competitiveness and water resource management must be planned together rather than independently.
Challenges in Water Governance
- Declining budgetary allocation: Tamil Nadu's Water Resources Department allocation was reduced by 8.06%, from ₹10,076 crore in the Interim Budget to ₹9,264 crore in the subsequent budget.
- Legislative vacuum: The Tamil Nadu Groundwater (Development and Management) Act was repealed in 2013, leaving the State without that specific groundwater management framework.
- Pending legislation: The Tamil Nadu Water Resources (Regulation, Management and Augmentation) Bill, 2026, has been passed but awaits the Governor's assent.
- Climate vulnerability: Erratic hydrological cycles, El Niño-related rainfall variability and water pollution can further aggravate water stress.
Way Forward
- Strengthen water governance: Establish an effective regulatory framework for groundwater extraction, conservation and allocation.
- Promote efficient consumption: Encourage industrial water audits, recycling, rainwater harvesting and wastewater reuse.
- Develop water infrastructure: Invest in sewage treatment, desalination, storage and distribution networks, particularly in water-stressed industrial regions.
- Adopt differential water pricing: Link industrial water charges to local scarcity and availability.
- Integrate water into industrial planning: Make water security a key consideration in investment decisions and industrial approvals.
- Ensure adequate funding: Strengthen financial allocations for water infrastructure and conservation.
Conclusion: Tamil Nadu's industrial growth must be supported by water security as essential economic infrastructure. Efficient pricing, stronger governance, prudent consumption and wastewater recycling are necessary to sustain long-term industrial competitiveness without exhausting natural resources.
