Question by  zoid (49)

How full is a septic tank supposed to be?


Answer by  ujwalraimjoshi (729)

Septic tank never should be full. It must be at least 20% empty. The reason behind this as the gas which comes out or generates may put pressure on the waste in the tank. Waste product may overflow because of gas pressure.


Answer by  DavidS (1517)

It should not be overly full. If your septic is full to the point that you are having drainage issues in your home then it needs to be pumped out. Most septic systems need to be pumped out and cleaned once ever 5 to 7 years but this is dependent upon usage and the amount of people using the system.


Answer by  poolguy (61)

Your tank should only be as full as the outlet pipe leading to your leach field, to allow a constant flow. If it's higher than that, you could have an obstruction in your outlet connection, you could have roots in your lines or your leach field needs to be dug up and replaced.


Answer by  DavidS (1517)

Approximately half way. There should always be some water in it. If it is much closer to three quarters full or more I would suggest having it pumped out or you will risk having it back up or rupture.


Answer by  Valentine62 (2131)

A septic tank should leach out before it reaches ground level, but if sludge remains over the top of the drain, then it is too full. When it reaches this point, you need your septic tank emptied and cleaned or it can back up into your plumbing system.


Answer by  Ionoone (112)

Water level should be up to the leech feild drain pipe

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