Researchers have investigated how the geological source and age of groundwater, which supplies our drinking water systems, might be linked to Parkinson's disease.
Scientists conducted this analysis using information from 21 major American aquifers. Their work, presented at the 78th annual meeting of the
American Academy of Neurology, examines whether water quality, determined by its origin, can have an effect on the risk of brain disorders. They compared municipal systems and private wells to identify trends.
Aquifers, these natural underground water reservoirs, have diverse characteristics. Carbonate aquifers, largely composed of limestone, allow water to flow quickly through cracks and channels. This configuration makes them more susceptible to surface contaminants. In contrast, glacial aquifers, formed over 12,000 years ago, are made up of sand and gravel, where water moves slowly and is naturally filtered over time.
The results show that people using water from carbonate aquifers have a 24% higher risk of developing Parkinson's disease compared to those whose water comes from other types of aquifers. When specifically compared with glacial aquifers, this risk reaches 62%. These figures are obtained after adjusting for age, sex, income, and air pollution.
In carbonate aquifers, older water appears to offer a certain level of protection. For each increase of one standard deviation in the age of the water in the aquifer, the risk of disease decreases by about 6.5%. Furthermore, water that entered the system within the last 75 years is associated with an 11% higher risk compared to water dating back more than 12,000 years. These elements indicate that the "youth" of groundwater could be a parameter to consider.
These results highlight the need to know the source of our drinking water, whether through local utilities or private well agencies. Although further investigations are required, this research offers new avenues for understanding environmental influences on health.
This study is based on the assumption of uniform exposure for all residents living near sampling sites. Individual differences in water sources or exposure levels were not measured directly. Thus, the conclusions should be interpreted with caution pending further verification.