We do not service or clean underground drains. Technicians will ensure that all downspouts are clear all the way to the ground. Also our technicians can assist by removing the downspouts from the underground drains and adding an elbow to them. That way the water empties out above ground while you contact somebody to snake the drain. Most of the time, the underground drains will need to be snaked. Depending on the length of the underground drain, and the location of the clog will determine if you are able to reach it with a snake drain purchased from a hardware store. If not, then you will need to contact a plumber or a Roto-Rooter.