Hi I notice an S-trap underneath the kitchen island sink . Would this be a red flag ? Thanks
They all are.
Hmm, yes. Check for proper venting as well since its an island
All S traps can be an issue. That one is an easy fix, just take the right side out and it’s a straight shot over the the T.
Island venting is an issue as well. There is probably an AAV under there.
Not a red flag, just a common issue. Report as such.