If you are volunteering or handling your own demolition, please keep in mind that storm water contains a host of pollutants including bio-hazards and feces and considered “black water” or Category 3. This is the worst classification and is grossly unsanitary. It could cause severe illness or death if ingested. Sources include sewer backup, flooding from rivers or streams, toilet overflow with feces, and stagnant liquid that has begun to support bacterial growth.
Make sure to wear proper Personal protective equipment (PPE) a N95 mask (or better), gloves, boots, long sleeved shirts and pants, goggles or protective eyewear. Also apply EPA-registered insect repellents before heading towards water.
You need to remove anything that the storm water touched within the next 48-72 hours if possible (i.e. Carpet, pad, flooring, baseboards, drywall, insulation, lower cabinets, door jambs/door slabs, all furnishings, refrigerator, etc). Make sure to document all damage with photos (before, during and after demolition). If possible, and if you have electricity, rent drying equipment from Home Depot/United Rentals/Sunbelt (rule of thumb is 3-4 air movers to 1 dehumidifier per 400 sqft placing air movers off the wall at a 45 degree angle creating a cyclonic effect. Dehumidifier should be placed in the center of the room or near).
Once your structure is dry, you will need to get a pump sprayer and a product called microban or biocide (bleach and water will NOT do) and spray all studs, base plates, and exposed concrete (this will kill any current or potential mold growth).
Also, when cutting drywall make sure you cut at 49.5″-50″ in order to give yourself and acceptable air gap at the bottom of the wall.