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Sanitary plumbing systems

Compliance requirements for discharges from wastewater and soil fixtures.

On this page:

  • Code requirements
  • Types of fixture
  • Basic rules for discharges

For more detail, see discharges and vents.

Code requirements

The Acceptable Solution G13/AS1 Sanitary plumbing applies to above-ground, non-pressure (i.e. gravity) flow sanitary plumbing for buildings of three storeys or less.

G13/AS1 does not cover:

  • specialised sanitary fixtures or appliances, e.g. such as used in hospitals, laboratories, and factories
  • industrial, chemical or toxic wastes that cannot legally be discharged into a sewer

Types of fixtures

Wastewater fixtures are all sanitary fixtures or appliances that receive wastewater and are not soil fixtures. Wastewater fixtures include  hand basins, showers, baths, sinks and tubs.

Soil fixtures collect solid and liquid excreted human waste and include toilets, urinals, slop sinks and so on. Soil fixtures must discharge directly into a drain or to a discharge stack.

Basic rules for discharges


Updated: 05 November 2018