Living Near Dry Cleaners Tied to Higher Parkinson’s Risk

Imagine your street as a quiet line of houses, a dry cleaner at the corner, and an invisible cloud of chemicals drifting through foundations and basements. It sounds unlikely. Yet new research suggests that proximity to dry-cleaning businesses could modestly raise the chance of developing Parkinson's disease.

Researchers publishing in npj Parkinson's Disease report that people living within roughly 150 meters of a dry cleaner had a higher estimated incidence of Parkinson's compared with those living several kilometers away. The signal is small but consistent. It points to environmental contamination as a contributor to neurodegenerative disease risk and raises urgent questions about how widely these industrial chemicals spread through neighborhoods.

People who lived within 150 meters (500 ft, 0.1 miles) of dry cleaners faced up to 23 percent higher risk of developing Parkinson's. 

How the study reached this conclusion

The team linked US Medicare enrollment and claims data for more than 19 million people aged 67 and older, spanning 2016 to 2018. About 180,000 records showed a Parkinson's diagnosis. The investigators combined those health records with a 2013 database of roughly 30,000 dry-cleaning business locations to estimate residential proximity to potential sources of solvent emissions.

After adjusting for demographic factors such as age, sex, race, and county-level income, the study found a roughly 14 percent higher estimated risk of Parkinson's for those living closest to dry cleaners (about 150 meters) versus those living 6.4 to 8 kilometers away. The association strengthened for some clinical subtypes: cases with gait and mobility problems saw up to a 23 percent higher estimated risk, and dementia-associated Parkinson's cases rose to 25 percent, though the distance relationship there was less robust.

"This study adds to growing evidence that environmental exposures may play an important role in Parkinson's disease," said Brad Racette, a neurologist at the Barrow Neurological Institute. "Identifying those exposures is an important step toward understanding how we might reduce the burden of this disease in the future."

Why dry cleaning might matter

Dry-cleaning operations historically used solvents such as trichloroethylene, commonly referred to as TCE. TCE is a volatile organic compound. It can migrate through soil and into buildings via vapor intrusion, linger in groundwater, and persist for years in older urban plumbing and infrastructure. The compound has been linked in prior work to higher Parkinson's risk and other neurological harms.

But exposure pathways are complex. It's not just proximity to a storefront. Building construction, local geology, aging sewer lines, and business activity patterns all influence how—and how much—chemicals move into living spaces. The present analysis used location data as a proxy for exposure. That leaves open uncertainty about actual individual-level doses and timing relative to disease onset.

Other environmental factors already implicated in Parkinson's include pesticides applied on agricultural land or golf courses, air pollution particulates, and emerging concerns such as microplastic-associated contamination. Together, these studies underline a broader truth: where you live shapes the chemical environment your body experiences over decades.

Living near a golf course could also increase risk of Parkinson's disease.

Limitations and what the findings do not prove

• The study is observational. Correlation does not establish causation.
• Dry cleaner locations used were from 2013, which may not reflect business closures, relocations, or changes in solvent use between 2013 and the Medicare window.
• There were no direct measurements of TCE or other solvent concentrations in air, soil, or indoor environments for the individuals analyzed.

Still, the geographic pattern of association was consistent across many US counties, implying that certain regions may be particularly vulnerable to contaminant migration due to local geology or infrastructure vulnerability. That geographic consistency strengthens concern that these are not random coincidences but signals worth investigating more thoroughly.

Expert Insight

"Even modest increases in risk matter when millions of people are exposed," said Dr. Elena Morales, an environmental epidemiologist who studies pollutant pathways. "This kind of population-level analysis helps prioritize hotspots for targeted environmental testing. If TCE or similar solvents are found in homes, remediation and policy change can follow. Prevention remains far cheaper and more effective than trying to treat late-stage neurological disease."

The study authors call for focused disease surveillance in areas surrounding dry cleaners, paired with environmental measurements and, where necessary, cleanup actions. They point to vapor intrusion mapping, updated inventories of commercial solvents, and remediation of contaminated groundwater or soil as practical next steps.

Conclusion

The new analysis adds weight to a growing public-health narrative: everyday locations sometimes conceal persistent chemical risks. Living near sources of industrial solvents appears to be associated with a small but meaningful increase in Parkinson's risk among older adults. The evidence does not yet prove cause and effect, but it does argue for more targeted environmental monitoring, stronger regulation of legacy contaminants such as TCE, and policies that prioritize remediation in vulnerable communities.

Policymakers, public-health officials, and clinicians will need better environmental data to act decisively. For now, the study is a reminder that the built environment and invisible chemistry around us can influence long-term brain health.