Are detergents in the outfall water from a washing machine harmful to vegetation?

I know that phosphates can be good for plants to a degree. At my house, a percentage of the wastewater from the washing machine is collected in a bucket. About once a week we empty the bucket into the bushes and flowerbeds. Is the detergent in the water toxic to the plants? So far it hasn't hurt, but I don't want to slow down growth.