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

19.8 billion litres

18.5 billion litres
Dam storage levels N/A 64%
Monthly streamflow into dams N/A 13.85 billion litres
September rainfall to date 81mm (September average rainfall 1876-2016) 77mm
Note: 1 billion litres = approximately 400 Olympic swimming pools. Please note the figures in this table are rounded (except for rainfall) to the nearest whole number.
  * Current to September 29, 2022

Water use 

Week ending Daily average use
(million litres per day)
Daily average forecast  
(million litres per day)
29/09/2022 658 734
22/09/2022 624 707
15/09/2022 655 684
08/09/2022 609 665
Note: Average water use is calculated based on 7 days of data, from Thursday 1 September through to Thursday 29 September, 2022.

Since 1 July 2022 to date, we have used 57.3 billion litres of water – which is 2.3 billion litres below the forecast target for this period.

Dam levels (total for 15 dams)

The metro dam storage levels are slightly up on last month and are sitting at a combined average of 64 per cent* of full capacity (or 403 billion litres). This time last year our metro dam storage levels were at 62 per cent* of full capacity (or 391 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 78.9 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 3,962 actions (warnings + fines) compared with 4,542 actions for the same period in 2021.

Annual rainfall

Perth has received 637.6mm of rainfall since 1 January 2022. The average (1876-2016) rainfall for the same period to the end of September is 757.5mm. The wettest day this month was 6 September, with 21mm of rainfall received in Perth.


The maximum temperature this month was recorded on 29 September at 28.9°C. The coolest day was recorded on 2 September at a maximum of just 16.1°C.


General water news

If you live in the Perth metro and Peel area, you may be eligible for Water Corporation’s current waterwise garden offers. These include:


Spring Sprinkler Check

Whether your irrigation is old or new, it’s a good idea to have it checked by a professional. Our Spring Sprinkler Check for Perth and Peel households includes:


  • Check for leaks in your irrigation system
  • Check for broken sprinkler heads and inefficient misting or micro sprayers
  • Check your irrigation controller and system are operating correctly
  • Set the optimal run times for your garden
  • Advice on how to get the most out of your irrigation system


Weather Based Irrigation Controller Rebate

Perth and Peel customers can claim a rebate of up to $300 towards a new weather based irrigation controller. This 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.


Garden Advice for Bore Owners

This offer is exclusive to garden bore owners in Perth and Peel to help assist in adapting to the new two-day watering roster. As part of this offer, a waterwise landscaper/garden designer will visit your property to conduct a review of your:


  • Plants to advise their watering needs or alternative options
  • Soils to check condition and advise appropriate treatment such as conditioning agents
  • Garden design to determine if a different layout could assist with water savings
  • Grouping of plants to see if layout changes are required based on water requirements
  • Other landscaping solutions or ongoing gardening services that may help the garden thrive


Terms and conditions and some exclusions apply. For full details or to apply, visit