Overflow relief gullies (ORG)

How should an ORG be installed?

Plumbing regulations require ORG’s to be installed:

  1. So that they sit at least 150mm lower than the lowest household drain. Because they are the lowest point, any sewage that can’t go down the sewers will flow out of this point rather than backing up inside household pipes and overflowing into floor drains.
  2. At least 75mm above ground level to avoid collecting stormwater during heavy rain.

An ORG should only be altered or installed by a licensed plumber.

Overflow relief gully

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