Radon in Water test kit sources:
It is always advised to contact your state radon program to check for water testing resources in your state or area. State programs can be found at http://sosradon.org/state%20radon%20contact%20map
Here are several radon in water testing sources available online:
http://www.radon.com/other_products/ (third item down)
https://www.prolabinc.com/radon-in-water-test-kit/ (click buy now and it's at the bottom of the page)
https://www.accustarlabs.com/products/radon-in-water-test-kit
https://rtca.com/product/radon-water-test-kit-2/
http://www.homestoreproducts.com/ (about halfway down the page)
