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Table showing target and actual water use, dam levels, streamflow and rainfall*
Target Actual
October water use to date

24.1 billion litres

23.6 billion litres
Dam storage levels N/A 62.9%
October streamflow into dams N/A 5.08 billion litres
October rainfall to date 51.5mm (October average rainfall 1876-2016) 25.4mm
Note: 1 billion litres = approximately 400 Olympic swimming pools.
* Data in table is current to October 30, 2022

Water use 

Week ending Daily average use
(million litres per day)
Daily average forecast  
(million litres per day)
28/10/2022 783 866
21/10/2022 831 832
14/10/2022 793 799
07/10/2022 746 767
Note: Average water use is calculated based on 7 days of data, from Saturday 1 October through to Friday 28 October, 2022.

Since 1 July 2022 to date, the Integrated Water Supply Scheme (IWSS)* has supplied 81.7 billion litres of water - which is 1.4 billion litres below the forecast target for this period.

*The IWSS supplies Perth, the Goldfield and Agricultural Region and some parts of the South West.

Dam levels (total for 15 dams)

October's metro dam storage levels are slightly down from September and are sitting at a combined average of 62.9 per cent* of full capacity (or 396 billion litres). This time last year our metro dam storage levels were at 63.7 per cent* of full capacity (or 402 billion litres).


*Please note some dams are filled from different sources - dam levels include the transfer of groundwater and desalinated seawater from treatment plants as well as streamflow (that comes from rainfall). As we use many different sources of water, dams are no longer an accurate indicator of the health of Perth's overall water supply situation.

Streamflow (total for 15 dams)

From 1 May 2022, the dams have received 85.1 billion litres of streamflow. The post-1975 average for the May to April period (called the streamflow year) is 177.1 billion litres.  

Sprinkler roster compliance

Since 1 January 2022, we have taken a total of 4,301 actions (warnings + fines) compared with 4,714 actions for the same period in 2021.

Annual rainfall

Perth has received 664.8mm of rainfall since 1 January 2022. The average (1876-2016) rainfall for the same period to the end of October is 809mm. The wettest day this month was 24 October, with 9.4mm of rainfall received in Perth.


The maximum temperature this month was recorded on 19 October at 32°C. The coolest day was recorded on 29 October at a maximum of just 17.9°C.


General water news

Looking to save water this Spring? There’s still time for Perth and Peel residents to claim a weather-based irrigation controller rebate.


Weather smart irrigation uses local weather data to determine your garden’s watering needs and adjusts sprinkler run times to ensure you’re only watering when needed. This not only helps save water but money off water bills too!


Wi-Fi enabled controllers also allow you to control your irrigation system from anywhere, using an app on your smartphone.


A total of $300 can be claimed as part of this rebate which includes:

  • Up to $200 to purchase an eligible:
    • Weather-based irrigation controller, or
    • Weather-based component for an existing irrigation controller, or
    • Weather-based irrigation controller and component
  • AND up to $100 for a consultation and controller set-up by a Waterwise Garden Irrigator.

Terms and conditions and some exclusions apply. For full details or to apply, visit Weather Based Irrigation Controller RebateFor other waterwise offers, visit