Lead, a metal found in natural deposits, is commonly used in household plumbing materials and water service lines. The greatest exposure to lead is swallowing or breathing in lead paint chips and dust.
If you are concerned about radon and you have a private well, consider testing for radon in both air and water. By testing for radon in both air and water, the results could enable you to more completely assess the radon mitigation option(s) best suited to your situation.
Understanding how your plumbing system functions will take some of the guess work out of planning your next renovation, or, at the very least, allow you to ask the right questions the next time you call a plumber to fix a leaky faucet.