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Tuesday, October 20, 2026

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NASA · Tuesday, October 20, 2026

NASA satellites map where people are moving the world's water

The File desk · Oct. 20, 2026, 6:44 a.m. ET

Confirmed1 primary sources

Status

Confirmed from NASA's Earth Observatory page, re-opened for this edition. The journal paper's link was not fetched and is not cited.
  • Confirmed
    Using GRACE and GRACE Follow-On, from April 2002 through November 2025, researchers marked 40 regions where stored-water changes lined up with human activity.
  • Confirmed
    North American declines named on the page include California's Central Valley, the southern High Plains, and Chihuahua, Mexico.
NASA said Tuesday that satellites measuring Earth's gravity found 40 regions where changes in stored water lined up with human activity, including irrigation, reservoirs, and land use. Groundwater-fed farms in California's Central Valley and the southern High Plains are among the places losing water.1
The record runs from April 2002 through November 2025, from the GRACE satellites and the GRACE Follow-On mission. The Earth Observatory says the newer analysis has five to 10 times more spatial detail than earlier ones. Lead author Mary Michael O'Neill, of NASA Goddard, said, “In four continental regions, an anthropogenic variable showed a stronger relationship with the storage trends than any climate variable did.”1
On this continent the page names declines in California's Central Valley, the southern High Plains of the United States, and Chihuahua, Mexico.
Why it matters (Estimate). A large share of U.S. food grows on groundwater that is pumped faster than rain and rivers replace it. A sharper map shows which farm regions are drawing down that store. It doesn't, by itself, say what a state should do about pumping.1
The page is an Earth Observatory story by Lindsey Doermann, posted at 12:01 a.m. ET. The journal paper isn't cited here. Its link wasn't opened.
How we know

Notes

  1. 1.NASA Earth Observatory, “The Human Fingerprint on Earth's Water Cycle,” Lindsey Doermann, Oct. 20, 2026, re-opened for this edition. https://science.nasa.gov/earth/earth-observatory/the-human-fingerprint-on-earths-water-cycle/ Data April 2002 through November 2025, GRACE and GRACE Follow-On. “the scientists identified 40 regions where the changes also aligned with human activities such as irrigation, reservoir impoundment, and land-use change.” “five to 10 times more spatial detail than previous analyses.” Declines in “California's Central Valley, the southern High Plains of the U.S., and Chihuahua, Mexico.” Mary Michael O'Neill, NASA Goddard: “In four continental regions, an anthropogenic variable showed a stronger relationship with the storage trends than any climate variable did.” The science desk recorded the page at 12:01 a.m. ET. The PNAS paper's link wasn't fetched and isn't cited. No map image is used.

What is still unknown or disputed

  • The journal paper wasn't opened. Only the Earth Observatory story is used.
  • The page doesn't give a volume of water lost, in gallons or acre-feet, and this story doesn't invent one.

Primary sources

Every claim in this story is drawn from the documents below. If a fetch failed, that is recorded on the card.

  1. Source 1

    The human fingerprint on Earth's water cycle

    NASA Earth Observatory · October 20, 2026

    The scientists identified 40 regions where the changes also aligned with human activities such as irrigation, reservoir impoundment, and land-use change.

    https://science.nasa.gov/earth/earth-observatory/the-human-fingerprint-on-earths-water-cycle/

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