October Term 2020 · Docket 65 ORIG.

Who pays for water lost to evaporation in New Mexico reservoirs?

Texas and New Mexico dispute who bears the cost of water lost to evaporation while stored in New Mexico at Texas's request.

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Texas v. New Mexico
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Verified source milestones

  1. — An official oral-argument transcript was verified.
  2. — An official oral-argument transcript was verified.

The arguments, in order

This case may have been argued more than once. Each entry below uses that session's official transcript. Later arguments do not erase earlier ones.

  1. Argument 1 ·

    What happened at the argument

    Texas argues the River Master's decision causes incalculable economic harm. Texas claims this harm occurs if New Mexico redeems credits during a drought.

    New Mexico argues Texas explicitly requested the water storage. New Mexico states this request justifies charging Texas for the resulting evaporative losses.

    Chief Justice Roberts questioned the relevance of forfeiture and waiver doctrines. He suggested the Court would not decide this case on those grounds.

    Read the official transcript for this argument · Official argument details

    Sources used for this argument breakdown

A citizen's guide to the whole case

What this case is about

The River Master awarded New Mexico a credit for evaporative losses. Texas argues this credit wrongly shifts the cost to its farmers. New Mexico argues Texas requested the storage and should pay for the loss.

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How the case got here

The Supreme Court heard oral argument in this case on October 5, 2020.

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What each side wants

Texas wants the Court to reject the evaporative loss credit. Texas argues this credit harms its farmers and businesses.

New Mexico wants the Court to uphold the evaporative loss credit. New Mexico argues Texas requested the storage and should bear the cost.

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What each side says

Texas argues the River Master erred in applying the manual section for requested storage. Texas claims this decision deprives west Texas of a year's irrigation water.

New Mexico argues Texas made an express request for storage. New Mexico contends this request triggers the manual provision that charges the requesting state for losses.

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What the justices asked

Chief Justice Roberts asked how Texas responds to its own request for storage. He noted an email titled Texas Request For Storage.

Chief Justice Roberts asked if the water can be considered stored in the Brantley Reservoir for Texas. He sought clarification on the storage status of the water at issue.

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Why it matters

This dispute determines which state pays for water lost to evaporation. The outcome affects irrigation water availability for farmers in west Texas. It also impacts economic stability for businesses relying on that water supply.

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What happens next

This article currently covers the argument record. Use the official docket link for later case activity.

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Official Court provenance

Official docket and case history · Official Supreme Court oral-argument detail page

Title and summary sources

Revision history

  1. Revision 1 · Official Transcript ·

    Correction: Rewritten to the concise citizen-facing editorial standard.

  2. Revision 2 · Official Transcript ·

    Correction: Migrated to the dated official Court activity contract without model use.

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