Using Laundry Water in the Garden
It is not considered safe to use raw home laundry gray water in a vegetable garden, for fear that unprocessed E. coli from minute amounts of fecal material present in children's underwear or diapers might infect your foods that are eaten raw. Leafy green vegetables are the most susceptible. For the same reason, it is also not considered safe to use gray water from showers and baths for the vegetable garden. However, there is absolutely no reason you can't use your gray water to water your fruit and nut trees, bramble crops, or flower beds. They would happily accepty any of this water you will divert to them
from Backwood Home Magazine