"PerryOne" wrote in message
...
A septic tank is always totally full of water...
As mentioned elsewhere, a tank must always be full, especially when
installing as the pressure of the backfill can damage the tank ..

Well not always. In PIMA county AZ, you are required to EMPTY the tank
when the house is sold and there must be an inspection of the EMPTY tank,
w/form submitted to the DEQ (County).