We are in the late stages of a build (Texas) and ran accross something that I am not sure is an issue. The builder gave us the option to install floor drains in each of the three return closets as well as the floor of the laundry room. However, today we realized that these drains are not simply draining water outside of the home but into the sanitary sewer line. I am concerned that this may be an issue with gas release and recirculating into the home because we are on septic. Should I be concerned? I wouldnt have even thought this would be to code.