If individual drains aren't the problem, you need to go to the source.
This report is for informational purposes. Working with sewage pipes carries health and property risks. If uncertain, consult a licensed plumber. The author assumes no liability for injury, damage, or code violations resulting from following these procedures. how to open blocked sewage pipe
If you have tried the steps above and the water is still backing up, it is time to call a licensed plumber. DIY methods have limits. You need a pro if: If individual drains aren't the problem, you need
Follow these steps to open a blocked sewage pipe: If uncertain, consult a licensed plumber
Before you start fixing, confirm that it is indeed a blocked sewage pipe and not just a localized clog.
Do you have a visible in your yard or basement? Has this happened repeatedly in the last few months?