Bricks, Masonry, Asphalt and Concrete - water marks on brick ledge facade underneath window?

We just bought a new home and before we moved in a wild snowstorm came through in Denver. Not that much snow but it was mostly wind driven.

My question is about water marks left on front of brick facade underneath living room window underneath the brick ledge on the bottom of the window. It is a vinyl dual pane window (4'x4') Not sure if it is just because water accumulates on top of the ledge and then melts or if it is getting behind the brick.

We were worried about the problem of hidden mold. Is there anything we can do to prevent the problem in the future.

Thank you for your help. Brad

Water marks indicate that water wet the unsealed area then dried. Perhaps it needs to be sealed then repainted. Check with the contractor of this new house.

It is unlikely that intermittent water will create an environment for mildew. Once the surface is sealed, there should be no more wetting of the material.