To add a data point, I recently had a grandparent who died with Parkinson's disease.
After doing research, it turns out their home was located very close to a Superfund cleanup site from a dry cleaner that operated in the 60's and contaminated the groundwater with TCE and PCE.
The chemicals leach into the groundwater and can spread hundreds of feet per year. Buildings located over these plumes are exposed to vapors which accumulate indoors over time and expose the occupants.
According to Wikipedia, the PCE solvent which is used at nearly every dry cleaner across the country has been known as a x10 risk factor for Parkinson's [1].
For California residents, you can find out about these groundwater plumes on the waterboards website. They are located all over Silicon Valley and former dry-cleaners around the country [2].
Similarly, my uncle has rapidly progressing Parkinson's caused by exposure to Agent Orange as a Seabee in Vietnam, his VA doctors have confirmed this as the cause.
After doing research, it turns out their home was located very close to a Superfund cleanup site from a dry cleaner that operated in the 60's and contaminated the groundwater with TCE and PCE. The chemicals leach into the groundwater and can spread hundreds of feet per year. Buildings located over these plumes are exposed to vapors which accumulate indoors over time and expose the occupants.
According to Wikipedia, the PCE solvent which is used at nearly every dry cleaner across the country has been known as a x10 risk factor for Parkinson's [1].
For California residents, you can find out about these groundwater plumes on the waterboards website. They are located all over Silicon Valley and former dry-cleaners around the country [2].
[1]: https://en.wikipedia.org/wiki/Tetrachloroethylene
[2]: https://geotracker.waterboards.ca.gov/