US EditionStudy finds association between groundwater age and Parkinson’s risk
Newer carbonate groundwater is linked to a 24% higher Parkinson’s risk, while older glacial groundwater shows a 6.5% lower risk per age increase, researchers found.
- On March 2, 2026, a preliminary nationwide study found people whose drinking water came from newer groundwater had a higher Parkinson's risk, analyzing 12,370 cases and more than 1.2 million matched controls across 21 major U.S. aquifers.
- Researchers note that newer groundwater recharged in the past 70–75 years has been exposed to more surface-level pollutants, and carbonate aquifers allow rapid flow, making them more vulnerable to contamination than glacial aquifers.
- Quantifying differences, the analysis found people drinking from carbonate aquifers had a 24% higher Parkinson's risk versus other aquifers, rising to 62% compared to glacial aquifers, with newer groundwater linked to an 11% higher risk.
- Researchers urged more study and local action, noting `While the increased risk was modest, the sheer number of people exposed to TCE in the environment means the potential public health impact could be substantial,` said Krzyzanowski, and that people can check their water source via local utilities or state and county groundwater resources.
- Researchers will present at the American Academy of Neurology's 78th Annual Meeting, April 18–22, 2026, that the study shows association, not causation, with a three-mile radius sampling limitation.
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30 Articles
Study finds association between groundwater age and Parkinson’s risk
People whose drinking water came from newer groundwater had a higher risk of developing Parkinson's disease than those whose drinking water came from older groundwater, according to a preliminary study released March 2, 2026, that will be presented at the American Academy of Neurology's 78th Annual Meeting taking place April 18-22, 2026, in Chicago and online.
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Newer groundwater associated with higher risk of Parkinson's disease
Highlights:
The invisible chemical in the air that could be raising Parkinson’s risk
A massive nationwide study has linked long-term exposure to the industrial chemical trichloroethylene (TCE) with a higher risk of Parkinson’s disease in older adults. Researchers examined over 1.1 million people, finding that those living in areas with the highest outdoor TCE levels faced a 10% greater risk of developing Parkinson’s.
Newer groundwater associated with higher risk of Parkinson’s disease
Highlights: A new study has found people whose drinking water came from newer groundwater had a higher risk of Parkinson’s disease than those whose water came from older groundwater. The study does not prove that newer groundwater causes Parkinson’s; it only shows an association. Older groundwater typically contains fewer contaminants because it is usually deeper and better shielded from contaminants. Researchers found drinking water drawn from…
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