Water insecurity in South Asia is often discussed as an environmental problem. But increasingly, it is also a question of governance, economic planning and regional cooperation. Climate change is altering rainfall patterns, increasing extreme weather risks and putting additional pressure on water systems that already face challenges related to access, management and quality.
The World Bank describes South Asia as one of the regions most vulnerable to climate shocks. Its recent assessment estimates that nearly 90 percent of the region’s population could be exposed to intense heat by 2030, while more than one in five people could face severe flooding (World Bank, “Climate Resilience”).
These risks do not affect water availability in only one direction. Some communities experience prolonged dry conditions, while others face destructive floods. The United Nations notes that climate change is exacerbating both water scarcity and water-related hazards, with Asia experiencing a particularly significant share of flood-related deaths and economic losses (“Water – at the Center”).
For South Asia, this creates a complicated policy problem: having water in a region does not necessarily mean having water security.
Beyond the Question of Supply
Water security depends not only on how much water exists, but also on whether people can access it safely and reliably. The Intergovernmental Panel on Climate Change has identified increased flood risk and deteriorating water quality as important contributors to water insecurity in large parts of South and Southeast Asia (IPCC).
This means that building infrastructure alone cannot solve the entire problem. Dams, reservoirs, irrigation systems and drainage networks can reduce particular risks, but their effectiveness also depends on planning, maintenance, institutional capacity and how water is allocated among competing users.
Agriculture is especially important. Water management in South Asia is closely connected to food security because millions of livelihoods depend directly or indirectly on agriculture. At the same time, growing cities and industries are increasing competition for water.
Pakistan provides one example of this wider challenge. A World Bank water-security assessment found that, without significant reforms and better demand management, the country’s water demand could increase by 50 percent and exceed available supply (“Pakistan’s Water Security Trajectories”).
The implication is not simply that Pakistan, or South Asia, needs more water. It suggests that how existing water resources are managed matters just as much as the quantity available.
A Regional Problem Cannot Always Be Solved Nationally
South Asia’s geography makes cooperation particularly important. Major river systems cross political boundaries, while the Himalayas provide water resources that support populations and economies far beyond the mountains themselves.
The World Bank’s South Asia Water Initiative was created to strengthen knowledge, institutions and cooperation around major Himalayan river systems. Although that initiative closed in 2021, its work continues through other regional programmes focused on transboundary water management and climate resilience (“South Asia Water Initiative”).
Cross-border water management is complicated by national interests. Countries need to protect their own populations, agriculture and energy requirements, while shared river systems create interdependence.
That makes water governance an issue not only for environmental ministries, but also for diplomacy and international relations.
The most contested water arrangement in the region remains the 1960 Indus Waters Treaty between India and Pakistan. In April 2025, following the Pahalgam attack, India announced that it was placing the treaty in abeyance until Pakistan ends what India describes as its support for cross-border terrorism, an allegation Pakistan denies.
On 31 August 2026, the Court of Arbitration hearing Pakistan’s case unanimously held that the treaty remains in force and that India cannot unilaterally suspend or terminate it. It also issued interim measures on the Ratle hydroelectric project (Permanent Court of Arbitration). Pakistan welcomed the ruling (Ministry of Foreign Affairs, Pakistan). India rejected it, stating that the Court was illegally constituted, has no jurisdiction over its sovereign decisions, and that the abeyance remains in force (Ministry of External Affairs). These competing positions show that transboundary water management cannot be separated from diplomacy: legal mechanisms, recognition of institutions and political trust matter as much as hydrological data or infrastructure when shared rivers become sites of strategic disagreement.
The Role of Better Governance
A long-term response to water insecurity requires several layers of action.
First, governments need stronger systems for collecting and sharing reliable water data. Better information can help authorities plan for floods, droughts and changing agricultural requirements.
Second, water policies need to consider demand as well as supply. Reducing unnecessary losses, improving irrigation efficiency and encouraging sustainable urban water use can reduce pressure on existing resources.
Third, climate adaptation needs to be incorporated into economic planning. The World Bank has noted that households and firms across South Asia will face increasing pressure to adapt to climate risks, particularly as governments operate under fiscal constraints (World Bank, From Risk to Resilience).
Finally, regional dialogue matters. Shared rivers do not follow political borders, and climate-related changes can affect several countries simultaneously. Cooperation does not remove disagreements, but regular communication, technical data-sharing and institutional mechanisms can provide ways to manage them.
Water Security Is Ultimately About People
The debate over South Asia’s water future can easily become a discussion of rivers, dams, glaciers and rainfall statistics. But behind every statistic are households, farmers, businesses and communities whose daily lives depend on predictable access to water.
The region’s challenge is therefore not simply to find more water. It is to build systems capable of managing uncertainty.
Climate change may make rainfall less predictable and extreme events more damaging, but policy choices will influence how societies respond. Stronger institutions, better data, efficient water use and regional cooperation can all contribute to greater resilience.
South Asia’s water future will be shaped by the climate, but also by the quality of the decisions made today.
Works Cited
Intergovernmental Panel on Climate Change. “Chapter 4: Water.” Climate Change 2022: Impacts, Adaptation and Vulnerability, IPCC, 2022.
Ministry of External Affairs, Government of India. Statement on the Court of Arbitration Award concerning the Indus Waters Treaty. 31 Aug. 2026.
Permanent Court of Arbitration. “Award on the Status of the Indus Waters Treaty and Order on Interim Measures concerning the Ratle Hydro-Electric Plant.” PCA Case No. 2023-01, 31 Aug. 2026, pca-cpa.org.
United Nations. “Water – at the Center of the Climate Crisis.” United Nations, Climate Change.
World Bank. “Climate Resilience in South Asia Will Be Private Sector Led.” World Bank, 3 June 2025.
World Bank. “Pakistan’s Water Security Trajectories.” World Bank Group.
World Bank. “South Asia Water Initiative (SAWI).” World Bank.
World Bank. From Risk to Resilience: Helping People and Firms Adapt in South Asia. World Bank, 2025.
