Snake in bathroom, is this normal?

Ok so while visiting my dad in central texas I went to use the restroom and when I got up I noticed a adult medium brown colored snake slithering under my brothers clothes in the bathroom by the toilet. I screamed for my dad to go get it and he said he went down a whole in our wall where our pipes come through. They are going through a drought right now and I was wondering what kind of snake this was and if it was normal to be in a bathroom?