radon and groundwater in York 5

https://foxtrot-wiki.win/index.php/Understanding_the_Risk_of_Radon_in_York_Homes

In York, where ancient bedrock meets modern water supplies, radon from uranium in granite and shale can dissolve into groundwater. This is especially concerning for private wells, which bypass treatment plants, but public water systems also test regularly. The real worry is that you can't see, smell, or taste radon; long-term exposure through drinking water may increase lung cancer risk, though most risk comes from inhalation after radon escapes from water into indoor air. Local geologists note…