Hi I would welcome any suggestions as to where the standing water under my floorboards may be coming from. I am having my mains supply checked this week. Is it possible that it is coming from a leaking radiator pipe? If so how would I check this? I have not had any problems with CH but have a tank-fed systems so (as I understand it) any leaking water would be replaced from the tank...?? It smells clean so don't think it is a waste water problem. ANY thoughts welcome. Thanks, Diane