For Radon in Water, you will need to capture a sample of your water in the sampling vial.
Collect a water sample as close to the water source as possible. You will want to ensure that the water goes through as few filters and aerators as you can; if you’re able to, disconnect any filter or aerators from the water source, as these release radon into the air and skew your test results.
When collecting the sample, submerge the glass vial completely under water. Ensure there is no air in the vial. Then, screw the lid on the vial while it is still under water. This ensures there is no air in the vial.
Now, double check the vial for air bubbles by turning it upside down. Air bubbles in the vial will ruin your test. If there are any air bubbles, take another sample and ensure there is only water in the vial.
You can find the full instructions for the Radon in Water test by clicking here.