It depends on whether or not you have a high ground water table under your homes foundation. This would be evident by water coming up through the basement floor, if there were not a sump pump previously installed. There are a lot of existing homes that do not have sump pumps and do not require them for exterior water management. Also the majority of water infiltration leaks that we encounter, come from water that has entered through the foundation wall before getting to the weeping tile to dissipate.