So I got sort of interested in the concept of dumping it in the washing machine and googled it myself. It seems like some people are doing it so they don't waste water - they are also watering houseplants and all sorts of things with the dehumidifier water. Trying to be super "green" I guess.I would think the problem for you with dumping it in the washing machine would be if the water is musty/moldy. Not saying your basement is a dirty, moldy area, but when I think of a basement with a dehumidifier I envision that's why you have the dehumidifier in the first place - to get rid of the mustiness? So I guess it would depend on how clean you think the water is and if it would have allergens, mold etc in it.