About the area
Grampians Wimmera Mallee Water services a large area — about 25% of Victoria — in the north-west of the state.
Grampians Wimmera Mallee Water supplies water to urban and rural customers via the extensive Wimmera Mallee Pipeline system. The larger urban areas in the south — Ararat, Stawell and Horsham — are supplied via separate systems. Many towns are also supplied from groundwater.
Grampians Wimmera Mallee Water sources most of its water from a system of storages in the Grampians, but the northern part of the rural pipeline system is supplied from the Murray.
More information on the water corporation can be found at Grampians Wimmera Mallee
2024-25 overview
Urban deliveries
11,038 ML of urban residential and non-residential deliveries were made (in urban and rural systems) in 2024-25, more than the previous year (9,099 ML in 2023-24).
Rural deliveries
6,450 ML of rural deliveries were made in 2024-25, less than the previous year (8,099 ML in 2023-24).
Wastewater recycled at treatment plants
77% of wastewater was recycled (3,008 ML of 3,888 ML), more than 67% in 2023-24.
Water deliveries
Table 1: Urban system water balance, Grampians Wimmera Mallee Water
Combined systems
Grampians Wimmera Mallee Water operates 3 combined (urban and rural) supply systems. The Wimmera Mallee pipeline supply system has been divided for reporting purposes into 5 supply systems, each of which supplies several towns. These are presented for simplicity as consolidated reports for the urban and rural systems. Water is sourced from the Murray and Wimmera basins.
Table 2: Combined system water balance, Grampians Wimmera Mallee Water
Recycled water
Water recycled at wastewater treatment plants can be used to supplement water available in river basins. Table 3 lists the wastewater treatment plants managed by Grampians Wimmera Mallee Water. Water discharged to the environment from treatment plants is included as an inflow to the water balance for each of the river basins.
More information can be found in How we account for water supply.
