We didn't notice when we bought the house that the entire back yard slopes toward the house. Nor that several of the neighbors' yards are higher than ours. The result is that during a heavy rainstorm, like the one last night, the neighborhood's water wants to get into our foundation.
The cleaner came yesterday and sanitized the basement from floor to windows with steam and microbicide. Then he brought in a small army of dehumidifiers and fans -- enough to make the electric meter spin faster than I'd ever seen it -- and in a matter of hours the humidity was down to 50% again, where our own dehumidifier could take over. Now the basement smells fresh and clean. We have to resist the urge to put all kinds of stuff down there -- the floor will still get wet during heavy rains. But it's a big step, and very satisfying, and our insurance paid for it!
The plumbing is fixed after just over 24 hours of water and sewer shut off, 2.5 days of plumbers working, and a big hole in our back porch...