Since it's the loss of air pressure inside the house that draws radon out of the soil, one radon mitigation technique increases the indoor air pressure by using a pump to push air into the basement. It doesn't take very much air to do this, so it does not affect the energy efficiency of the house, particularly since the pressurization is in the basement, a room not normally occupied.

For new home construction, a gravel buffer around the outside of the basement level accumulates radon from the soil, since the air gaps between the gravel are much larger than the air spaces between the fine soil particles. This radon will easily waft out to the outdoor air or can be forced out with an air blower. Either way, the radon gas goes out to the atmosphere much more easily than it can be forced to seep through tiny cracks in the basement walls.

The most modern and most common mitigation technique used currently is active subsoil depressurization (ASD). This can be retrofitted to existing homes, as well as being used in combination with the gravel subsoil layer. In soil depressurization, a pocket is dug underneath the concrete slab or wall of the basement or foundation, and an air pump sucks the air out of this pocket. The vacuum created in the pocket draws soil gases with radon into it, where the air pump can suck it out and ventilate it to the outdoors. This prevents the soil radon gas from getting sucked into the house. Additional protection is gained by putting a plastic barrier sheet between the soil and the concrete walls of the basement.

If radon is known to be present in the water supply, then it should be aerated before it goes indoors. This is normally done at a water treatment plant, which uses aeration to remove other dissolved gases in addition to radon.