Yes. An open sump pit allows humidity and potential soil gases (like Radon) to enter your living space. In the humid PNW, an open pit is also a breeding ground for insects and musty odors. At Basement Expert, we install NDS-standard, gas-tight sealed basins. This not only keeps your basement drier and smelling fresher but also ensures that the pump is protected from debris that can fall into an open pit and jam the impeller.