Indus Waters Treaty

What is the Indus Waters Treaty?

The Indus Waters Treaty (IWT) is a water-sharing agreement signed on September 19, 1960 in Karachi between Indian Prime Minister Jawaharlal Nehru and Pakistani President Ayub Khan, brokered by the World Bank. It governs the distribution of the waters of the Indus River system -- six rivers that flow through India and Pakistan. The treaty is considered one of the most durable water-sharing agreements in the world, having survived multiple wars and diplomatic crises for over six decades.

The treaty divides the six rivers into two groups: (1) Eastern Rivers -- the Beas, Ravi, and Sutlej -- allocated to India, with a combined mean annual flow of 33 million acre-feet (41 billion cubic metres); and (2) Western Rivers -- the Indus, Jhelum, and Chenab -- allocated to Pakistan, with a combined mean annual flow of 135 million acre-feet (167 billion cubic metres). India thus controls roughly 20% of the total water, while Pakistan receives 80%. India retains limited rights to use western river waters for non-consumptive purposes such as navigation, hydroelectric power generation (run-of-river projects), and limited agricultural use.

The treaty establishes a Permanent Indus Commission with commissioners from both countries who meet regularly to resolve issues. Disputes can be escalated through a three-tier mechanism: bilateral negotiations, Neutral Expert, or Court of Arbitration. As of March 2026, India has placed the treaty in abeyance following the April 2025 Pahalgam terrorist attack, making the treaty's future uncertain.

Key Features

Current Status / Latest Data

• On April 23, 2025, following the Pahalgam terrorist attack in Kashmir, India suspended the treaty, linking resumption to Pakistan ending support for terrorism.
• India stopped water flow on the Chenab River from Baglihar Dam and conducted reservoir flushing at the Salal and Baglihar projects.
• In January 2025, a Neutral Expert delivered an initial verdict affirming competence to adjudicate differences raised by India regarding the Kishanganga and Ratle projects. A final award is expected by end of 2026.
• As of March 2026, India has reiterated at the UN that the IWT will remain in abeyance until Pakistan credibly ends terrorism support, and has called for revisiting the treaty framework citing climate change, clean energy needs, and demographic pressures.
• The treaty's future remains a major diplomatic and geopolitical issue.

Legal Status of India's Suspension — International Law Analysis

This is the most critical UPSC Mains angle — is India's unilateral suspension legally valid under international law?

The Core Problem: No Suspension Clause in IWT

The word "suspension" does not appear anywhere in the IWT text. The treaty's exit/modification clause is Article XII, which states:

"This Treaty shall remain in force until terminated by a duly ratified Treaty concluded for that purpose between the two Governments."

This means the treaty can only be terminated or modified by mutual agreement — no provision for unilateral suspension exists.

India's Legal Argument (Implied)

India has not explicitly cited a legal basis but implicitly relies on:

Pakistan's Counter-Position and International Law Scholars

• Pakistan's position: The suspension is illegal; India is violating its obligations; Pakistan has filed a case before the Permanent Court of Arbitration (PCA) — the Court ruled in January 2025 that it has jurisdiction (competence) to adjudicate Kishanganga and Ratle disputes despite India's claims that the Court of Arbitration under IWT has no jurisdiction
• International water law scholars (International Water Law Project, ASIL, EJIL:Talk!): India lacks a valid legal basis — VCLT Articles 60/62 have extremely high bars; customary international water law (codified in the 1997 UN Watercourses Convention) prohibits unilateral disruption of transboundary rivers
• Vienna Convention status: Neither India nor Pakistan has ratified the VCLT — but it is recognised as customary international law binding on all states
• Article 56 VCLT: Treaties with no exit clause require 12 months' advance notice before withdrawal — India did not provide this

The Court of Arbitration Ruling (January 2025)

The IWT provides for disputes to be referred to a Court of Arbitration (established under Annex G of the treaty). Pakistan initiated proceedings regarding Kishanganga (Jhelum tributary) and Ratle (Chenab tributary) hydropower projects, claiming India's designs violate treaty provisions.

• India contested the Court's jurisdiction, arguing the same issues were simultaneously referred to a Neutral Expert (which India preferred)
• The Court issued a Supplemental Award on Competence (January 2025): affirmed it has jurisdiction; the PCA-constituted court will proceed with Kishanganga and Ratle
• A final award is expected by end of 2026 — this would come even amid India's suspension
• The Court's January 2025 ruling also implicitly rejected India's suspension as having no legal standing in treaty proceedings

India's Additional Arguments for Treaty Revision

Separate from the suspension, India has formally called for IWT renegotiation citing:

1. Climate change: Himalayan glacier retreat altering river flows on which the 1960 calculations were based
2. Clean energy: India's hydropower development on western rivers is constrained by IWT; blocking India's net-zero ambitions
3. Population growth: India's water needs have grown substantially since 1960
4. Security: Continuing cross-border terrorism makes the treaty's cooperative framework unworkable

Exam note: India formally notified Pakistan of desire to modify the treaty in January 2023 (under Article XII's modification provision) — before the Pahalgam attack and full suspension. Pakistan rejected this request.

Summary: Legal Validity Assessment

UPSC Exam Corner

Prelims: Key Facts

• IWT signed in 1960; brokered by the World Bank
• Eastern Rivers (India): Beas, Ravi, Sutlej
• Western Rivers (Pakistan): Indus, Jhelum, Chenab
• India gets ~20% of total Indus system water
• Permanent Indus Commission oversees implementation
• India suspended the treaty in April 2025 after the Pahalgam attack

Mains: Probable Themes

1. Geopolitics of water sharing -- IWT as a model for transboundary water cooperation and its current crisis
2. India's case for revisiting the IWT -- climate change, hydropower potential, and evolving demographic needs
3. Legal implications of treaty suspension under international law and the Vienna Convention on the Law of Treaties
4. Hydropower development on western rivers -- Kishanganga, Ratle, Baglihar and associated disputes
5. Water as a strategic tool -- the debate between cooperative diplomacy and coercive hydro-diplomacy

Sources: Indus Waters Treaty text (1960); Wikipedia — Indus Waters Treaty; MEA India — IWT suspension notification (April 23, 2025, mea.gov.in); PCA — Court of Arbitration on Kishanganga and Ratle (January 2025 Supplemental Award on Competence); Vienna Convention on Law of Treaties 1969 (Articles 56, 60, 62); International Water Law Project Blog — "A Treaty on the Brink?" (June 2025); ASIL — "Suspension of Indus Waters Treaty" (asil.org); EJIL:Talk! — "IWT Suspension as Paris Agreement Compliance Case" (ejiltalk.org); The Diplomat — "India's Indus Waters Treaty Suspension: What Happens Next?" (May 2025); New Security Beat — "Suspending the IWT" (June 2025); Organiser — India's UN stance (March 2026).