The ball valve has been replaced and we finally have water in the house! The plumber is pretty cool and in talking to him I happened to ask him about the water hookup for the ice maker. He traced the line and found where the connection from the old owners refrigerator is in the line, and it turns out that it is one of the old vampire tap styles. He explained that these are not the best and he would recommend replacing them, because if the seal in there were to fail as they often do, then water would flow unchecked into the basement. Because these are not actual valves but an actual piercing of the pipe they are connected to, they are also no longer used and would technically not be up to code for a new build. It turns out that we actually have two of these on the cold water line, in addition to the one for the refrigerator’s ice maker, there is also one going to the furnace’s humidifier. Unfortunately the plumber does not have time to replace these today due to other appointments, so he will be coming back again tomorrow.