Groundwater depletion across Iran is linked mainly to human water use

Nature · Published 2 October 2026 Swipe more like this →

In short: Researchers analyzing monthly groundwater-level data across hundreds of basins in Iran found that human water use appears to be the main factor behind the country's groundwater losses. Studying data from 2002 to 2015, they estimated that Iran lost about 74 cubic kilometers of groundwater during this period, with natural drought acting mainly as a trigger that intensifies the decline.

The study found that while natural droughts can trigger and speed up water loss, large-scale depletion across Iran's basins is mainly linked to extensive human withdrawals. This pattern is associated with extreme overdrafts in about 77% of the country's land area.

The researchers quantified these changes using publicly available monthly groundwater-level data from 478 sub-basins and 30 basins. Because the study is observational, relying on existing datasets rather than controlled experiments, it can show association but not prove that human withdrawals are the sole cause.

Why it matters: Iran's groundwater crisis appears to be driven mainly by human water use, not just natural drought.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?

Related

• Localized groundwater depletion threatens long-term irrigation across major American farming regions
• Why is Iran's largest, most resource-rich province also its most impoverished and water-stressed?
• Iran's geography is defined by a ring of massive mountains
• Climate change and human activity are straining India's vital groundwater reserves
• Groundwater depletion threatens to significantly reduce cropping intensity across India
• Identifying gaps in how we monitor chemicals in our water and soil
• Human niche construction has fundamentally reshaped global biodiversity over millennia
• Improved algorithms enhance sea surface temperature accuracy at high latitudes
• Sulfate pollution has likely offset much of human-caused greenhouse warming
• Increasing water scarcity is limiting vegetation growth across the Northern Hemisphere
• Human-induced warming alters the frequency and patterns of global climate fluctuations
• Indian farmers adapt to climate change through incremental and systemic shifts

More in Nature · Latest · A–Z · All topics