The dirt in my crawlspace is always damp (looks dark brown), even in the summer months. This is near Seattle.

This in turn creates a musty odor which seeps into the living area.

I need someone to help me figure out where the moisture comes from, so I can perhaps shut it down. There is a neighboring house that is several feet more elevated than my house. I wonder if the water run-off from their lawn could be the source of the problem.

What kind of contractors can help me with this?