Reuse waste water from your property

Collected safely, it can be used to irrigate lawns and gardens. It's not suitable for drinking and the cleaning products that are washed down the drain may harm the environment.

Project Status: When you need to do this

Greywater is the waste water that comes from your washing machine, shower or bath.

Reusing wastewater from kitchen sinks and dishwashers is not recommended unless it is chemically treated as it contains high levels of fat, grease and food remains that can clog soils and create unwanted smells.

What you need to do

Ways to re-use greywater

Manual collection

Small amounts collected from the washing machine or shower to immediately water plants.
Greywater diversion device

The device redirects untreated water to irrigate lawns or gardens through underground drainage at least 10 cm below the surface. The device is controlled by a tap or switch that will flush the water away to a sewer when it is not required. You won’t need approval if the device has a WaterMark licence. Diversion devices must be installed by a licensed plumber.
Greywater treatment systems

More advanced than a diversion device, these systems collect and disinfect greywater which can then be used to irrigate gardens, flush toilets and in washing machines. You will need to contact us for permission to use a treatment system and it must be fitted by a licensed plumber.

Other information

Advantages of greywater re-use

Human bacteria found in greywater when we wash is digested by organisms in the soil
Cleaning product particles are broken down and absorbed by plants
Helps to preserve drinking water which is a precious resource
Reduces the amount of water and sewage diverted to oceans and rivers
Helps to reduce water bills
Ensures gardens are watered in dry periods