An ejector system still needs a working sewer line. If you have to install one for the pump, you might as well do it propely and install it for the building. Mechanical systems are designed to serve systems that cannot be served by conventional gravity sewers. They are subject to many failures and if it is the sole drainage for a building, then it should have dual pumps and a full alternating, emergency on, and alarm system with a building water supply cut-off to prevent water from being used if the pump is out of service. That system cannot be installed for $6,200.00 and anything less will have major problems down the road.: I have a friend who was told her sewer line had collapsed. To replace the line about $5200, to install a sump pump/lift station $6200. Does the price quoted sound in line and which is the better option?