Is there radon in your well water?

Is there radon in your well water?

It's possible if your water comes from a well. PA DEP says radon in water is more likely when the source is ground water, like a private well, and not usually a problem when it's surface water.

Radon from the soil is usually a much bigger risk than radon from water. So DEP says to test your air first.

When should you test your water?

DEP's order is:

1. Test the air in your home. 2. If you find a radon problem and your water comes from a private well, have your water tested.

DEP's consumer's guide adds that if you have a private well and you're concerned, testing both air and water gives you a fuller picture of how to fix it. The devices for testing water are different from the ones for air.

If your water comes from a public supply, DEP says to contact your water supplier. Some public systems treat their water before it reaches you.

Why does radon in water matter?

Mostly because of the air. PA DEP says most of your risk from radon in water comes from radon released into the air when you shower and use water around the house. Swallowing it is a much smaller risk.

How is radon removed from well water?

PA DEP says it can be easily fixed, in one of two ways:

• Point-of-entry treatment removes radon before the water reaches your taps, for the whole house. It usually uses an aeration system or granular activated carbon (GAC) filters.
• Point-of-use treatment removes radon at one tap only. DEP says it doesn't reduce the risk from breathing radon released from all the other water you use.

DEP's figures for whole-house treatment:

• Aeration: typically cuts radon in water by 95 to 99 percent. Generally more efficient, needs annual cleaning, and vents the radon outdoors.
• GAC filters: typically 85 to 95 percent. Best for moderate levels, around 50,000 pCi/L or less in water. Radioactive by-products can build up on the carbon, so the tank may need shielding and careful disposal.

DEP suggests talking over the pros and cons with its radon office or a water treatment professional. See certified companies serving York County.