Our water overview

Updated: Thursday, 28 May 2020

Current

42.5%

268 GL

Last year

45%

284 GL

Change

5.7%

-16.2 GL

To 9am

0.00

mm

May total

May average*

32.20

mm

88.70

mm

We need steady, regular rain in order to soak our catchments and get water flowing into our dams. Slowly declining rainfall means Perth's dams receive much less streamflow than in past years. Streamflow is the amount of water entering our dams from our catchments and is measured by changing water storage volumes. The water in our dams is no longer just made up of inflows from rain. Groundwater and desalinated water are stored in these dams during periods of low demand so it is available when it is most needed in the hotter months.

Total dam levels

Total Dam Capacity

Perth Metro
42.5%
267.85 GL
Last year
44.6%
281.34 GL
Change
Icon change arrow
-4.8%
-13.48 GL

Total Dam Capacity

South West
30.7%
110.94 GL
Last year
47%
169.88 GL
Change
Icon change arrow
-34.7%
-58.94 GL

Total Dam Capacity

Great Southern
49%
1.62 GL
Last year
52.3%
1.72 GL
Change
Icon change arrow
-6.4%
-0.11 GL

Total Dam Capacity

Mid West
79.8%
0.02 GL
Last year
87.8%
0.02 GL
Change
Icon change arrow
0%
0 GL

Total Dam Capacity

North West
43%
4661.07 GL
Last year
59.4%
6428.44 GL
Change
Icon change arrow
-27.5%
-1767.37 GL

Dam storage for the last 14 days - metro supply

Dam storage for the last 14 days - metro supply
Year Today 27/05 26/05 25/05 24/05 23/05 22/05 21/05 20/05 19/05 18/05 17/05 16/05 15/05 14/05 13/05 12/05 11/05 10/05 09/05 08/05 07/05 06/05 05/05 04/05 03/05 02/05 01/05 30/04 29/04
2020 267.9 267.7 267.4 266.9 266.3 266.2 266.3 266.4 266.6 266.7 266.7 266.8 266.9 266.9 267.0 267.2 267.2 267.2 267.2 267.1 266.9 266.5 266.5 266.3 266.2 266.3 266.3 266.5 266.5 266.6
2019 281.3 281.5 281.8 281.9 282.4 282.5 282.6 282.7 282.9 283.0 283.0 283.1 283.2 283.6 283.9 284.2 284.6 284.7 285.1 285.2 285.6 285.7 285.9 286.0 286.2 286.4 286.7 287.1 287.4 287.6
Comparison -13.5 -13.8 -14.4 -15.0 -16.0 -16.3 -16.3 -16.2 -16.3 -16.3 -16.4 -16.3 -16.3 -16.8 -16.9 -17.0 -17.4 -17.5 -17.9 -18.2 -18.7 -19.1 -19.4 -19.7 -20.0 -20.1 -20.3 -20.7 -20.9 -21.0
N/A = Data not available. Storage measured in GL.

Monthly dam volume comparison - metro supply

Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2020 294.94 283.32 274.08 267.85 266.79 N/A N/A N/A N/A N/A N/A N/A
2019 333.65 317.65 303.57 291.21 283.69 281.77 291.51 302.77 325.42 326.26 318.98 306.35
2018 270.72 263.17 253.37 249.70 248.40 256.88 278.49 344.19 370.90 371.77 363.19 349.35
2017 197.74 194.59 189.45 186.42 185.27 188.32 197.48 238.72 270.02 285.20 282.51 277.58
2016 163.09 155.03 147.98 146.33 149.90 156.92 163.41 178.38 197.34 209.81 209.94 205.44
2015 219.15 203.51 190.36 183.38 179.93 178.31 175.30 177.08 182.60 182.22 179.52 172.37
2014 212.05 197.95 182.03 170.36 168.22 174.21 188.13 206.14 230.42 248.48 244.79 235.79
2013 185.24 172.25 159.56 153.83 153.15 155.42 156.60 174.23 207.29 244.20 238.57 225.54
N/A = Data not available. Storage measured in GL.

Our water sources

Our water supply is made up of a combination of sources, including desalinated seawater, groundwater, groundwater replenishment and streamflow. As climate change continues to have a profound impact on our water supply, we must plan our future by securing climate-resilient water sources. Below is a breakdown of our water sources.

You can also learn more about where your water comes from on our Perth's water supply tool.
Desalination icon
%
Desalination
Groundwater icon
%
Groundwater
Dams icon
%
Dams
Groundwater replenishment icon
%
Groundwater replenishment