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Does my septic tank need to be completely buried?

Septic tanks need to be buried with an access and inspection opening for ease of maintenance.

Yes. Septic tanks must be buried.

Apart from this, septic tanks must have an access opening capable of being extended to ground level as well as an inspection opening. This makes it easy to conduct maintenance regularly. Additionally, the access opening must be watertight to prevent water (e.g. groundwater and stormwater) from entering the septic tank.