We have been having a sewer type smell coming from our Shower Drain. I have checked all of the other drains in the bathroom and in the house and this seems to be the only one that is causing the odor. It is not a mildew smell, it’s more of a sewer smell. The house is only 9 months old…What could be causing this odor?
Sounds like you have a trap seal problem,either you have no trap or improperly installed trap,or no vent which your losing the trap seal from siphonage or partial clog causing seal loss ,or leak under shower causing smell ,if your house is only 9 m old you shouldnt have a clog, call the plumber who did the work, with a properly plumbed dwv system you shouldnt have a sewer odor.