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
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.
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
Tips for safe grey water use
- Use only on plants that humans won’t eat or touch
- Use only second rinse water
- Don’t use water that has washed nappies
- Make sure greywater does not pool on the ground surface
- Don’t over water plants
- Use greywater within 24 hours
- Don’t use when residents are sick