Kansas v. Nebraska
The Supreme Court ruled that Nebraska must pay Kansas $1.8 million on top of actual damages for recklessly overusing shared river water under the Republican River Compact, but stopped short of issuing an injunction against future violations.
The Court also approved changing a technical accounting formula so Nebraska would no longer be wrongly charged for water it imported from outside the river basin, showing how far the Court will go to keep interstate water-sharing deals working as intended.
“Or said another way, Nebraska recklessly gambled with Kansas’s rights, consciously disregarding a substantial probability that its actions would deprive Kansas of the water to which it was entitled.”
The Court's explanation of why Nebraska's conduct amounted to a knowing breach of the compact.
How it got here: Kansas filed suit directly in the Supreme Court under its original jurisdiction over disputes between states; the Court appointed a Special Master, whose report and recommendations both states then challenged.
The Case in Depth
What happened
Kansas, Nebraska, and Colorado share the Republican River under a 1943 compact approved by Congress. After a dispute over Nebraska's groundwater pumping, the states signed a 2002 settlement with technical rules for measuring water use. Kansas later said Nebraska used far more water than allowed; Nebraska countered that the settlement's accounting formula wrongly counted water it imported from outside the river basin against its allowance.
The question before the Court
When Nebraska used more than its fair share of a shared river under a water-sharing agreement with Kansas, could the Supreme Court make Nebraska hand over some of its extra profits, and could it also rewrite the technical formula the states used to measure water use?
The Court's answer
Partly — the Court sided with Kansas on the money question and with Nebraska on the accounting question. It agreed Nebraska recklessly overused shared river water and ordered Nebraska to disgorge (give up) $1.8 million in extra profits on top of the $3.7 million in actual damages Nebraska already agreed to pay, reasoning that this remedy would deter future violations without requiring proof that Nebraska acted deliberately. The Court declined, however, to issue an injunction against Nebraska, finding no strong evidence it would violate the deal again.
On the accounting dispute, the Court agreed with Nebraska that the settlement's technical formula wrongly counted water Nebraska imported from outside the river basin against its water allowance, and approved changing that formula so it would match what the states actually intended when they signed their agreement.
Curious how the Court got there? See the step-by-step legal reasoning →
Why it matters
States that share rivers under interstate compacts now know the Supreme Court can order an upstream state to give up profits from overusing water, not just pay for the downstream state's losses, discouraging states from treating penalties as an acceptable cost of taking more than their share. The ruling also shows the Court will correct flawed technical formulas embedded in water-sharing agreements when they produce results the states never intended.
What changes now
This is a final resolution of the exceptions before the Court, not a temporary order. Nebraska must pay the $3.7 million in agreed damages plus $1.8 million in disgorgement, and the states must apply the corrected accounting formula going forward. The Republican River Compact Administration will continue overseeing compliance in future years, with the threat of further disgorgement if Nebraska breaches again.
What this does not decide
The Court did not decide that disgorgement is available whenever a state merely breaches a compact — it tied the remedy to Nebraska's reckless disregard of Kansas's rights, not intentional wrongdoing, and left open how courts should measure disgorgement amounts in future cases with different facts.
Concurrences and dissents
Concurrence in part — Justice Roberts
Chief Justice Roberts agreed with most of the Court's reasoning, including adopting partial disgorgement as a remedy, and joined the sections describing the case background and applying it. But he did not think the Court's equitable powers extended to rewriting the Accounting Procedures the states themselves had agreed to, joining Justice Thomas's opinion on that specific point instead.
Dissent in part — Justice Scalia
Justice Scalia joined Justice Thomas's opinion in full, agreeing that disgorgement and accounting reform were both improper. He wrote separately only to caution that modern Restatements of the law, including the disgorgement provision relied on by the majority, often reflect what scholars think the law should be rather than what it actually is, and should be treated skeptically.
Dissent in part — Justice Thomas
“Claiming to draw from a vast reservoir of equitable power, the Court ignores the limits of its role in resolving water-compact disputes between States.”Justice Thomas's core objection that the majority exceeded its proper authority over interstate compacts.
Justice Thomas argued the Court should have treated the dispute as an ordinary contract case rather than invoking broad equitable powers. He agreed Nebraska knowingly failed to comply and that no injunction was needed, but would have rejected disgorgement entirely because Nebraska's breach was not deliberate, and would have rejected reforming the settlement's accounting formula because the states made no drafting mistake, only a mistaken belief that the formula would work as intended.
How the Court got there
The legal reasoning, step by step
- The Court explained that when it resolves disputes between states over shared rivers, its power is fundamentally equitable, meaning it can shape flexible remedies to serve fairness rather than being confined to rigid legal rules, especially once Congress has approved a water-sharing compact as federal law.
- Applying that framework, the Court agreed with the Special Master that Nebraska had 'knowingly failed' to comply with the compact — not by intentionally trying to cheat Kansas, but by recklessly gambling with Kansas's water rights, since Nebraska delayed meaningful conservation steps and ignored repeated warnings that it was exceeding its share.
- The Court then addressed whether reckless (rather than deliberate) misconduct could justify disgorgement, a remedy that strips a wrongdoer of profits beyond simple compensation. It concluded that when a state recklessly disregards another state's water rights and profits from doing so, disgorgement helps deter future breaches and stabilize the compact.
- Weighing Nebraska's later compliance efforts against its earlier misconduct, the Court found a modest disgorgement award appropriate, and for similar reasons found that Kansas had not shown enough risk of Nebraska repeating the violation to justify a court order (an injunction) backed by contempt penalties.
- Turning to the accounting dispute, the Court held that when a technical formula in a water-sharing settlement produces results neither state intended — here, wrongly charging Nebraska for water it imported from outside the basin — the Court can correct that formula to align it with the states' actual agreement, especially because leaving the error in place would violate the underlying federal compact itself.
Doctrinal impact
Cases affected by this decision
Reaffirms Texas v. New Mexico (482 U. S. 124)
The Court relied on this case's approach to flexible equitable remedies for compact violations, including partial monetary relief.
Reaffirms Kansas v. Colorado (543 U. S. 86)
The Court cited this case as precedent for modifying a technical measurement method to accurately reflect a compact's terms.
Reaffirms Porter v. Warner Holding Co. (328 U. S. 395)
The Court relied on this case for the principle that equitable powers expand when public rights under federal law are at stake.