WA's wastewater, Rainwater & Irrigation Professionals
Greywater Reuse Systems
Unit 1 / 18 Wandeara Crescent | Mundaring WA 6073

Interesting Facts

Each of us needs to adopt reuse strategies for a sustainable future.  

Water is becoming an increasingly precious resource. Worldwide demand is growing for this irreplaceable resource and, although over 70% of the earth's surface is covered in the stuff, less than 0.5% of it is suitable for consumption. Don't expect that the demand for water will merely keep pace with the 19% growth expected in population. While the earth's occupancy has doubled in the past 100 years, overall water use has quintupled. 


  • Reusing wastewater from laundry and bathroom/s can save about 100,000 L each year
  • This is derived from laundry 42L/person/day and bathroom 51 L/person/day
  • Typical family of four produces about 360 L/day of greywater = 135,000 L/year
  • Average Australian family uses 800 L of fresh water each day, and about one-third to one-half of this is used on the garden.
  • There is an increasing awareness of the need to recycle and reduce waste; however, there is also little evidence of any real desire in the community to reduce the level of consumption.
  • We all need to treat and recycle waste to prevent pollution, and to conserve and re-use our limited resources.
  • Each of us needs to adopt reuse strategies for a sustainable future.
  • Generally, the community supports greywater reuse, and the interest in reuse schemes is high. However, the initial capital outlay to install reuse systems is also high and this prohibits the implementation of reuse systems.
  • Each of the greywater systems discussed here have specific advantages and particular applications. These types of systems have been approved because of the intention to reuse wastewater to irrigate garden areas. However, the use of greywater to provide effective irrigation is limited, as subsurface piped trench systems generally do not supply an adequate or consistent watering regime for plants. Dripper systems are now becoming more popular, and may be better suited for plant watering.
  • On-going monitoring of greywater reuse systems will help determine their effectiveness to save water, reduce nutrients and pathogens, and irrigate plants.

Rainwater Tanks - some facts

Rainwater tanks are a more cost-effective alternative to other water saving measures. The study conducted by economists found that rainwater tanks are more than five times as energy efficient as a desalination plant per kilolitre of water produced. Nearly 40 per cent of Adelaide households have installed them, but only 5 per cent of households in Perth, Melbourne and Sydney have them.

To calculate how much rainwater you can collect;

For 10mm of rain fall
200sqm roof = 2,000 litres X 80% collection / rain bounce
= 1,600 litres water stored

For 2,500 litres water stored
Toilet  3 litres / flush – 140 litre / week
Laundry 80 litres / wash  - 320 litre / week
Total Usage = 460 / week = 5 weeks storage after the last rain 

Around 55,000 litres of water could be collected from a 100 m² roof area and used to supply part of your household’s water needs.

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Unit 1 / 18 Wandeara Crescent | Mundaring WA 6073