The most common situation for single-family houses still connected to the sanitary sewer system is a downspout that drains into the sanitary sewer via a standpipe next to the foundation of the house.
![Downspout into standpipe diagram Downspout into standpipe diagram](/media/content-assets/images/img_1900.gif)
Disconnecting
The usual method for disconnection in this case is to cut off the downspout, install a permanent cap on the standpipe, and allow rainwater to drain onto the lawn.
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