Investigated leak that has spread throughout the house. Found that leak began in the top floor front bathroom. Found that there was no evidence to show that the source of water was the bathroom sink or toilet, both appliances were tested and observed to find no water escaping them. While the toilet is old and a replacement recommended, no leak can be observed to come from the toilet. Found that the meter was not spinning when water was on. While the toilet is old and the fill valve lets some water into the tank after it is filled, this would not be enough to cause a flood and the toilet is not clogged. Concluded that the only place the water could have come from would be the shower. Councluded that the source of the leak was negligence, whether from an overflow or the shower head being on at an awkward angle.