We have a large cast iron sink in our basement. Just this evening we
went into the basement and noticed raw sewage and water had collected
in the bottom of the sink. It had just accumulated and hadn't begun to
smell to much before we got things cleaned up.
I noticed that everytime I flush the toilet upstairs water and some
sewage bubbles up through the drain into the sink.
The pipe runs down from this sink into the mainline, also attached to
this line is our washer.
Our house is connected to the sewer and is on a slight gradient above
the street. I should also mention that it has been raining heavily
over the last day or so, if this has any bearing.
Can anyone give us some advice on how to investigate and fix this