There are two main reasons for this problem. One is the connection of storm drains to the sewer system, which is illegal. If you have a downspout or area drain connected to your sewer, this should be corrected so the stormwater is discharged in an appropriate manner. The other common cause of this problem is old sewer lines, both City mains and private laterals. Older sewers were made of clay pipe, which can break or separate over the years, allowing rainwater in the ground to get into the pipe that leads to the treatment plant. You are strongly urged to have your lateral inspected and replaced if it is clay pipe. This will help reduce potential overflows at the SASM treatment plant.