How we calculate our charges

Business customer? Go to wastewater pricing plans

Your monthly bill

Your Watercare bill sets out the water and wastewater charges for the month.

View sample bill

Water charge

We charge per 1,000 litres (= 1 kilolitre) of water supplied to your property, as measured by your water meter.
This charge is volumetric: it is based on the amount of water you use each month, as measured by your water meter.

Wastewater charges

There are two parts to your wastewater bill:
  • Fixed charge: this pays for maintaining the wastewater network.
  • Volumetric charge: this pays for collecting and treating your wastewater outflow.

Fixed wastewater charge

All properties with a water meter pay a fixed wastewater charge as well as the volumetric water charge. This pays for maintaining the public wastewater network.  

Each month, your bill shows the pro rata (proportional) wastewater charge for that billing period (number of days). 

For example, if the annual fixed wastewater charge is $205, the daily rate is 205 divided by 365 days = 56 cents. So for 30 days the charge would be about $16.

Volumetric wastewater charge

We base the wastewater charges on 78.5 per cent of the water volume coming in to your property, as measured by the water meter. This assumes that, on average throughout the year, 78.5 per cent of the water becomes wastewater by going down the drain via your kitchen sink, dishwasher, shower, bath, washing machine, toilet, etc.  

Allowance for outdoor activities

We do not charge for the remaining water (21.5 per cent). We allow this for your outdoor activities where water does not enter the wastewater network, such as: 
  • watering the garden
  • washing a car or boat
  • waterblasting the house.
Why is wastewater charged at a higher rate?
Why are apartments charged at 90-95 per cent for wastewater?
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