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Sewage backup or main drain clog.

Answer what you can see or measure. The list keeps the causes your answers have not set aside, and offers the one cheap reading that best separates them.

  1. Safety lookFirst
  2. Questions0 of 4
  3. Readings0
  4. Still on the list–
Read the whole guide

Safety look

Before any reading: is anything like this on site?

Taken as what you could see, not as a finding that none of these are present.

What decides which causes can apply

0 of 4

One drain backing up on its own is a local clog, so this comes before the causes.

Is it one drain, or several?
Where does the building drain to?
Has it backed up before?
Has it been cleared, and what came back?
Where does the backup show first?if known
What is happening?if known

Nothing on this page is saved anywhere: the answers live in its address. General guidance for a qualified person, not a finding about any home. The person on site decides.