Posted: 21/10/2017 at 12:29
I don't know about observation tanks, the system here dates from 1960. We can lift manhole covers to see if it's backing up and another over the tank to see if there's a flow in or if it's full but not draining away
Is this water in the area of the septic tank or the pipe to it?
We find a set of drain rods are essential for living with a septic tank