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Peer-reviewedCC BY-NC-NDNature Communications

The long tail of nitrate pollution in groundwater challenges governance of global water quality

  • Weidong Zhao1,2
  • Xiaoxu Jia3,4
  • Liantao Niu1,2
  • Wei Hu5
  • Ting Yang6
  • Tuvia Turkeltaub7
  • Andrew M. Binley8
  • Yongqiu Xia9
  • Xiaorong Wei10
  • You Li1,2
  • Ming'an Shao1,2,10
  • Xiaoyong Liao11,12
12 affiliations
  1. 1College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China
  2. 2Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
  3. 3College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China. [email protected]
  4. 4Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China. [email protected]
  5. 5New Zealand Institute for Bioeconomy Science Limited, Private Bag 4704, Christchurch Mail Centre, Christchurch, New Zealand
  6. 6State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi'an University of Technology, Xi'an, China
  7. 7Zuckerberg Institute for Water Research, Ben-Gurion University of the Negev, Sede Boqer Campus, Negev, Israel
  8. 8Lancaster Environment Centre, Lancaster University, Bailrigg, Lancaster, UK
  9. 9State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China
  10. 10State Key Laboratory of Soil and Water Conservation and Desertification Control, Northwest A&F University, Yangling, Xianyang, China
  11. 11College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China. [email protected]
  12. 12Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China. [email protected]
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Abstract

Groundwater nitrate pollution threatens drinking water safety. Legacy nitrogen (N) in the vadose zone creates a “long tail” of leaching that can persist for decades after policy actions. Here we model global nitrate dynamics in groundwater from 1961 to 2100. By 2020, shallow aquifers had accumulated 162 ± 6 Tg N as nitrate, exceeding the WHO drinking water limit across 10% of global land area. This contamination is sustained by a large nitrate reservoir of 4037 ± 214 Tg N in the vadose zone, which will continue to generate new contamination hotspots for decades. Even under an immediate transition to zero-N-surplus, 4% of affected regions are projected to remain above the WHO limit beyond 2100. To guide effective governance, we classify global croplands into four management archetypes and identify tailored strategies that balance water quality, food security, and soil sustainability. These findings redefine the temporal scope of governance, identify priority regions, and provide a science-based roadmap towards safe groundwater. Groundwater nitrate pollution persists for decades due to a large legacy nitrogen reservoir in the vadose zone. Even with immediate emission cuts, 4% of affected regions will exceed WHO limits beyond 2100, requiring tailored governance strategies.

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Cite

BibTeXRIS
BibTeX
@article{zhao2026long,
  title = {{The long tail of nitrate pollution in groundwater challenges governance of global water quality}},
  author = {Weidong Zhao and Xiaoxu Jia and Liantao Niu and Wei Hu and Ting Yang and Tuvia Turkeltaub and Andrew M. Binley and Yongqiu Xia and Xiaorong Wei and You Li and Ming'an Shao and Xiaoyong Liao},
  journal = {Nature Communications},
  year = {2026},
  month = jun,
  doi = {10.1038/s41467-026-75014-8},
  url = {https://doi.org/10.1038/s41467-026-75014-8},
  note = {CC BY-NC-ND},
}
RIS
TY  - JOUR
TI  - The long tail of nitrate pollution in groundwater challenges governance of global water quality
AU  - Weidong Zhao
AU  - Xiaoxu Jia
AU  - Liantao Niu
AU  - Wei Hu
AU  - Ting Yang
AU  - Tuvia Turkeltaub
AU  - Andrew M. Binley
AU  - Yongqiu Xia
AU  - Xiaorong Wei
AU  - You Li
AU  - Ming'an Shao
AU  - Xiaoyong Liao
PY  - 2026
DA  - 2026/06/30
JO  - Nature Communications
DO  - 10.1038/s41467-026-75014-8
UR  - https://doi.org/10.1038/s41467-026-75014-8
AB  - Groundwater nitrate pollution threatens drinking water safety. Legacy nitrogen (N) in the vadose zone creates a “long tail” of leaching that can persist for decades after policy actions. Here we model global nitrate dynamics in groundwater from 1961 to 2100. By 2020, shallow aquifers had accumulated 162 ± 6 Tg N as nitrate, exceeding the WHO drinking water limit across 10% of global land area. This contamination is sustained by a large nitrate reservoir of 4037 ± 214 Tg N in the vadose zone, which will continue to generate new contamination hotspots for decades. Even under an immediate transition to zero-N-surplus, 4% of affected regions are projected to remain above the WHO limit beyond 2100. To guide effective governance, we classify global croplands into four management archetypes and identify tailored strategies that balance water quality, food security, and soil sustainability. These findings redefine the temporal scope of governance, identify priority regions, and provide a science-based roadmap towards safe groundwater. Groundwater nitrate pollution persists for decades due to a large legacy nitrogen reservoir in the vadose zone. Even with immediate emission cuts, 4% of affected regions will exceed WHO limits beyond 2100, requiring tailored governance strategies.
SN  - 2041-1723
ER  -