radon and groundwater in York 3

https://alpha-wiki.win/index.php/Why_Your_Home_Needs_a_Radon_Mitigation_System_in_York_County

Radon in York's groundwater comes from natural uranium in granite and shale, seeping into private wells and basements. Testing well water here is crucial because dissolved radon can release into indoor air when you shower or run the tap, increasing lung cancer risk. Local geology makes some neighborhoods more prone—household tests and water aeration systems can help lower levels.