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The State of Tamil Nadu v. The State of Karnataka

Original Suit · 2026 INSC 113Decided 2 Feb 2026
ORGNL.SUIT No.-000001 - 2018
Justice Vikram Nath · Justice N. V. Anjaria · Justice Sandeep Mehta

Background

Tamil Nadu filed an original suit directly in the Supreme Court under Article 131 of the Constitution against Karnataka and the Union of India, alleging that Karnataka was unilaterally constructing check dams and diversion structures across the inter-State Pennaiyar river and its tributaries without Tamil Nadu's consent, impeding the river's natural flow and depriving Tamil Nadu of its share of the water. Tamil Nadu sought declarations that the construction was illegal, injunctions against further construction, and a direction to the Union to act on its complaint. Ministerial-level negotiations between the two States, as mandated by the Inter-State River Water Disputes Act, failed to produce a settlement, with Tamil Nadu insisting the dispute be referred for adjudication by a Tribunal.

Decision Breakdown

The Court noted that the Union of India's own affidavit confirmed the negotiation process had been indefinitely deferred because Tamil Nadu had firmly taken the position that the dispute should go to a Tribunal rather than continued talks. Relying on its earlier precedent in T.N. Cauvery Neerppasana Vilaiporulgal Vivasayigal Nala Urimai Padhugappa Sangam v. Union of India, the Court held that once negotiation under the Central Government's aegis fails to resolve an inter-State river water dispute, the Central Government is statutorily obligated (the word "shall," not "may") to constitute a Water Disputes Tribunal. It accordingly directed the Central Government to notify and constitute such a Tribunal within one month, while keeping all substantive questions about the actual water-sharing entitlements open for the Tribunal to decide.

Lesson Learnt

When inter-State negotiations over shared river waters break down, the law does not leave the dispute in limbo: the Central Government has a mandatory (not discretionary) duty to set up a Tribunal to adjudicate it, and the Supreme Court will enforce that obligation through a specific timebound direction.

Official source (sci.gov.in)View Judgment (PDF)

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