Radon and open sump pumps.
When inspecting a home for a possible install of a radon mitigation system one of the first things we look for are open penetrations and cracks that are in the basement or crawl area. We want to make sure our pressure barrier (the walls and floor) are sealed as tight as possible so we don’t suck conditioned air from the home and/or make our mitigation system work harder than it needs to.
Along with any cracks and floor joints we ALWAYS make sure our sump pits are securely covered and sealed as you can see.