I just read another article about this, but the affected group is military from Camp Legume. The water in Legume was contaminated, and its actually given a control group test for the incidence of Parkinson’s with Camp Pendleton, where the water was not contaminated.
Spoiler: it looks like the farmers are right
https://www.wired.com/story/scientists-thought-parkinsons-wa...
Amazing thing is TCE was banned by the Biden EPA in 2024 and Trump’s EPA stopped its ban.