Drinking newer groundwater linked to up to 62% higher Parkinson's risk
newsweek.comIn this case it should be 62% lower in Australia in general, because water is taken from deep source for entire country.
82%[0] of Australian utilities' water comes from surface sources, so you'd need to look at only the section of the population who drink exclusively groundwater.
[0] https://www.bom.gov.au/water/npr/docs/2022-23/Urban_National...
> Drinking newer groundwater linked to
I only drink older groundwater.
1962 is my preferred groundwater year