I have an old house from the 60's. I have lived here for almost two years now. No flooding issues, previous owner had no flooding issues and my inspector said there were no signs of previous flooding. My condensate pump for my humidifier next to the drain starting running very loudly and I am going to replace it. I noticed on inspection that the drain nearby had visible water. I am surprised to see any water in the drain as my dehumidifier has not been running since October, maybe a couple times in November. The hose is connected to the dehumidifier. Should I consider this an emergency and call a plumber right away? I am honestly not sure how this drain works and there is no pump on it. I think it drains to somewhere outside the house, but it is a black box to me.
Best Answer
Like the commenters said, I think you're looking at the result of normal trap function. Water is retained to the level of the "weir", or the high point along the bottom of the drain pipe. This acts as a plug and prevents sewer gas from escaping into the home.
It probably looked about like this before time and nature had their way: