The short answer is: Yes.  However, that's because we want to say a bit more about water features.  If you have a bird bath in your backyard, and it just holds water, then that would likely attract mosquitos because it's stagnant water, it's not moving.  All of the water features we install have some level of movement to them.  Whether it's falling water in a waterfall, or pushing water up in a  fountain, we always make sure there's some level of movement to avoid attracting mosquitos.
Mosquito larvae can only survive in stagnant water.  Additionally, mosquitos that have just hatched must lay on the surface of the water in order for their wings to dry, therefore mosquitos will avoid moving water when laying eggs.