Welcome to Q&A for Home Maintenance Q&A section, where you can ask questions and get answers from me and other members of the community.

Spam, self-promotion, questions with abusive, inappropriate language, and irrelevant questions will be deleted.
All of the questions are moderated!

You'll be notified when your question is answered. Please reply with Feedback to share whether a solution worked or didn't work. Thank you!

Connect on Google+
Find on Google+ Local

sewer backs up the kitchen vent stack

0 votes
My kitchen sink started to back up and I also get water up the vent stack. a portion of the vent pipe was cut and replaced with PVC. The new section was connected to the remainder galvanized pipe. I think the connection is lower than the kitchen sink drain and the sewer back up gets to that connection first and start to spill over since this is not a pressure connection. Would this be the possible scenario as to why sewer water gets into the vent stack? Thanks much


Felix Condurat


asked in Plumbing by felixcondurat (120 points)
Share this question on your favorite network.

1 Answer

0 votes


Hi Felix, 
What you described is possible but it all depends on the configuration of those drain / vent pipes. The very common kitchen sink drain clog area is at a first (or right below it) 90 (often a “T”) connection inside the wall. That’s where the vent is often attached as well. 
Kitchen sink common clog area
If this is how your kitchen plumbing was assembled, waste water will equally rise inside the vent and the sink.
answered by darekrudy (21,730 points)