Our water overview

Updated: Wednesday, 08 July 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
44.4%
279.76 GL
Last year
45.9%
289.57 GL
Change
Icon change arrow
-3.4%
-9.82 GL

Total Dam Capacity

South West
34.9%
126.08 GL
Last year
50.2%
181.68 GL
Change
Icon change arrow
-30.6%
-55.6 GL

Total Dam Capacity

Great Southern
53.4%
1.76 GL
Last year
53.4%
1.76 GL
Change
Icon change arrow
0%
0 GL

Total Dam Capacity

Mid West
77.9%
0.02 GL
Last year
81.7%
0.02 GL
Change
Icon change arrow
0%
0 GL

Total Dam Capacity

North West
39.4%
4270.38 GL
Last year
55.7%
6029.91 GL
Change
Icon change arrow
-29.2%
-1759.53 GL

Dam storage for the last 14 days - metro supply

Dam storage for the last 14 days - metro supply
Year Today 08/07 07/07 06/07 05/07 04/07 03/07 02/07 01/07 30/06 29/06 28/06 27/06 26/06 25/06 24/06 23/06 22/06 21/06 20/06 19/06 18/06 17/06 16/06 15/06 14/06 13/06 12/06 11/06 10/06
2020 N/A 279.8 279.4 278.7 278.4 278.3 278.1 277.7 277.4 277.0 276.3 274.9 274.4 273.8 273.8 273.7 273.4 273.0 273.1 273.0 272.9 272.6 271.8 271.8 271.8 271.8 271.7 271.6 271.1 271.0
2019 289.9 289.6 289.3 288.6 287.7 286.8 286.7 286.4 286.0 284.6 284.6 285.1 284.1 283.7 283.5 283.1 282.4 281.9 282.1 282.1 282.4 282.3 282.3 282.5 282.5 282.6 282.5 281.4 280.9 280.4
Comparison N/A -9.8 -9.9 -9.9 -9.3 -8.6 -8.7 -8.7 -8.6 -7.6 -8.3 -10.2 -9.7 -9.9 -9.6 -9.4 -9.0 -8.9 -9.0 -9.1 -9.4 -9.8 -10.5 -10.6 -10.7 -10.8 -10.8 -9.8 -9.8 -9.4
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 294.94 283.32 274.08 267.85 267.04 272.40 278.46 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