Do you have to have “proven” fact in order to disclose? Our property had a water issue too, overwatering by the condo conversion next door, up the hill. (Don’t buy a house on the bottom of a hill!) The water flowed downhill and through the city’s meter, along the pipes and right under house. It was a bad scenario and took almost a year to get the condo conversion to do something. We installed french drains and a sump pump. The pump is on city property, in front of the water meter. I know, I know, its bad, but the City would do nothing and there was mass amounts of water coming up from ground onto the house. Cost thousands of dollars too…. Do we have to disclose this?