Sorry, no recommendations for a company, but a few tips from a recent sewage back-up in the basement myself. 1) carpet is gone. Just take it up and toss it. 2. You (or basement tennants) should always have an actual mop around in case of this – both of us only had swiffer or steam mops and had to use lots of rags. 3. Bleach 1/4 to 3/4 water everywhere + lots of fans and you will probably be fine.