Water storage levels

About our water storages

Our customers’ drinking water comes from three major supply systems:

Bulk treated drinking water from Melbourne Water
Bulk untreated water from Southern Rural Water, which we treat at our filtration plants (Rosslynne Reservoir, Merrimu Reservoir, Pykes Creek Reservoir)
Water from our local reservoirs and bores, also treated at our filtration plants (Woodend, Lancefield and Romsey System).

Most of our drinking water supply comes from Melbourne Water, however local storages and groundwater help us meet demand for our regional customers. A mix of water sources helps when rainfall is low, and less water is reaching our storages.

A graphic showing the approximate water usage of residential 60%, business 25% and Othre uses 15%.

The chart above shows approximately how much water we source and treat locally, including water from Southern Rural Water, and how much we get from the Melbourne Water supply. This can vary from year to year.

Of this total, 57% is residential, 29% non-residential, and 14% is non-revenue water/other uses.

Greater Melbourne, including Melton and Sunbury

Most of our drinking water comes from reservoirs managed by Melbourne Water. Up to date information on storage levels for Greater Melbourne can be found on the Melbourne Water website.

The tables below show local storage levels on 19 June 2026.

More detailed information on individual water sources can be found in our Drinking Water Quality report.

Bacchus Marsh

Storage	GWW share (ML)	Current volume of share (ML)	Percent of share	Change since last week
Merrimu Reservoir	26,013	14,822	57%	0.0%

The storage volume of Merrimu Reservoir is shown as a percentage of GWW’s 80% share. For more information about Merrimu Reservoir refer to the Southern Rural Water website.

Bacchus Marsh, Longforest, Rockbank and Toolern Vale are also supplied from the Melbourne Water supply system depending on conditions.

Myrniong

Myrniong is supplied with water from Pykes Creek Reservoir. For more information about Pykes Creek Reservoir refer to the Southern Rural Water website.

Gisborne, Macedon, Mt Macedon, Riddells Creek

Storage	GWW share (ML)	Current volume of share (ML)	Percent of share	Change since last week
Rosslynne Reservoir	21,844	10,610	48.6%	+0.2%

The storage volume of Rosslynne Reservoir is shown as a percentage of GWW’s 86% share. For more information about Rosslynne Reservoir refer to the Southern Rural Water website. Gisborne, Macedon, Mt Macedon and Riddells Creek are also supplied from the Melbourne Water supply system depending on conditions.

Romsey and Lancefield

Storage	Total capacity (ML)	Current volume (ML)	Percent full	Change since last week
Romsey and Lancefield	455	418	91.9%	+0.2%

The total volume of water in storage for Romsey and Lancefield shown above includes water in reservoirs with natural catchments, plus a number of transfer and storage basins.

Romsey and Lancefield are also supplied with water from Rosslynne Reservoir and the Melbourne Water supply system depending on conditions. Groundwater from local bores also contributes to supply, which is not included in the storage totals.

Woodend

Storage	Capacity (ML)	Level (ML)	Percent full	Change since last week
Woodend	366	224	61.2%	0.0%

The total volume available for Woodend above includes water from reservoirs with natural catchments, plus a number of transfer and storage basins.

Woodend is also supplied with water from Rosslynne Reservoir and the Melbourne Water supply system depending on conditions.

Additional water available from Mount Macedon reservoirs

Storage	Capacity (ML)	Level (ML)	Percent full	Change since last week
Mount Macedon storages total	355	355	100%	0.0%

Water from the former Macedon and Mount Macedon supply system is available for transfer across the network when needed.

Find out more

Where your water comes from

Reservoirs and waterways

Important customer update