Indus River System in 2025: India's Suspension of Cooperation under the Indus Waters Treaty and Implications for South Asian Water Security
Introduction
The year 2025 was marked as the most significant development for the Indus Waters Treaty (IWT) since its signing in 1960. For over six decades, the agreement had withstood the test of time, surviving wars, military standoffs, and political tensions between India and Pakistan. Frequently cited as one of the world's most enduring water treaties, the IWT provided a detailed framework for the equitable distribution of the waters of the Indus River System and technical mechanisms for dispute resolution. However, this seemingly permanent accord was severely challenged by the terrorist attack in Pahalgam, Jammu and Kashmir, on 22 April 2025, which resulted in the deaths of many civilians. Pakistan rejected India's accusations of Pakistan-based militants' involvement, calling for an independent investigation. Soon after, India announced its intention to suspend cooperation under the IWT until Pakistan takes "concrete and effective steps" against cross-border terrorism. Pakistan rejected India's position, arguing that the IWT is a binding legal treaty and cannot be suspended unilaterally by one of the signatories.
The events of 2025 not only undermined the security and technical aspects of the IWT but also made it the focal point of the regional great power rivalry between India and Pakistan.
Why Was the 2025 Decision Significant?
The IWT had weathered many storms since its inception in 1960, including the 1965, 1971, and 1999 wars between India and Pakistan, as well as numerous political standoffs. In all of these cases, the technical cooperation between the two countries under the IWT remained uninterrupted, facilitated by the permanent Indus River Commission. However, the situation in 2025 was different, as India's government stated that the changed strategic circumstances made it impossible to continue cooperation under the existing framework. In particular, India argued that the IWT's effectiveness relied on the "spirit of mutual trust and goodwill," which no longer existed due to Pakistan's support for cross-border terrorism. Notably, India's position did not differ significantly from its previous statements about the need to revise the IWT.
Meanwhile, Pakistan reiterated its belief in the IWT as a framework that cannot be "unilaterally suspended or terminated" and urged India to return to the technical cooperation mechanisms stipulated by the treaty.
Immediate Aftermath of the Announcement
India formally notified Pakistan that technical cooperation under the IWT would be suspended until India's security concerns were addressed. In particular, the Pakistani press reported that the following measures had been taken:
1. The meetings of the permanent Indus River Commission have been suspended.
2. India has ceased providing hydrological data to Pakistan.
3. India has suspended its participation in the dispute-resolution procedures under the IWT.
4. India has gained greater flexibility in the reservoir operations at the upstream Western Rivers, which Pakistan opposed.
These developments triggered a lively debate among engineers, hydrologists, and international law scholars about the technical and legal ramifications of India's decision.
Engineering Considerations: What Can and Cannot Be Changed?
One of the most common misconceptions about the IWT is that an upstream country can completely stop the flow of water downstream by blocking the river. In reality, the hydrological and infrastructural realities of the Indus River System make it almost impossible to completely regulate the flows of the Indus, Jhelum, and Chenab Rivers, which constitute the Indus Basin's Western Rivers.
India's storage capacity is relatively limited, and the flows of the Indus River are highly seasonal, meaning that the country's dam operations can only temporarily regulate the flows. While the reservoir operations can affect the timing of releases, they cannot completely block the river or provide a long-term diversion of waters.
At the same time, the operations, maintenance, and development of dams and reservoirs in India can have downstream consequences for Pakistan, particularly in terms of water supply and floodplain management. Thus, the technical aspects of the IWT cannot be ignored, even if the immediate changes to the flows are limited.
Legal Considerations: What Can and Cannot Be Changed?
The 2025 events sparked a heated debate among international law scholars about the future of the IWT.
In particular, some analysts noted that India's decision to suspend cooperation under the IWT reflected a fundamental change in its strategic preferences. Meanwhile, many analysts pointed to the lack of a formal mechanism for unilateral suspension of the treaty and argued that India's actions went against the spirit of the IWT. Thus, the legal status of the IWT remains disputed, with both sides presenting plausible arguments.
Implications for Pakistan
For Pakistan, the future of the Indus River System is now more closely tied to the stability of its domestic reservoir operations and forecasting capabilities. In particular, the country needs to:
1. Ensure the reliability of its reservoir operations.
2. Improve its forecasting capabilities.
3. Optimize water use, particularly in agriculture.
4. Pay more attention to groundwater management.
5. Diversify its strategies for coping with droughts.
6. Become more proactive in water security matters in general.
Implications for India
Meanwhile, India's analysts highlight the need for the country to focus on hydropower development, modernize its infrastructure, improve its forecasting capabilities, and update its institutional frameworks for water management.
Climate Change Considerations
The IWT was concluded in 1960, when the impacts of climate change on the Indus Basin were poorly understood. Today, both countries face new challenges, including the impacts of glacier melt, changes in snowpack accumulation, and increased flood and drought risks. Rising agricultural demand, urbanization, and population growth will further exacerbate these pressures, making it even more challenging to manage the waters of the Indus River. The future of the IWT will depend on how India and Pakistan will address these difficult questions.
The Future of the IWT
The events of 2025 were yet another reminder that the IWT is not just a technical water management instrument but also a political tool. While the treaty's technical mechanisms remain intact, the very survival of the IWT is now in doubt. Whatever happens to the IWT in the future, it is clear that both countries need to take a more comprehensive look at the basin's management.
Conclusion
The Indus Waters Treaty has been one of the most successful examples of international water management agreements. The events of 2025 constituted its greatest challenge to date, intersecting with regional security, treaty law, hydrology, and climate change. For engineers and policy analysts, the future of the IWT is now inextricably linked with the need to address technical, institutional, and legal aspects of water management in the Indus Basin.
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