michelle miller spent the day with a health official spreading the word about the health risks. the big key is flooded water you know is unsafe. reporter: this doctor is making the round in areas that were flooded in houston. as the harris county public health director, he is warning residents about the risks they face, while cleaning up their homes. then me of all of this is mold and mold loves moisture. he got a foot of water and now mold is growing in her garage, and inside her house. when you took out the, the cabinetry and the sheet rock, were you wearing protective masks. no. see, that s what we have been saying, make sure you wear protection when you are doing all this. what we don t want while you are fryi trying to help everything and get back to normal life, is, that you also get sick in the process. doctor shaw says it is important to clean up fast because of what contaminated walter leaves behind. floodwater can harbor dangerous bacteria which ca