Wannon Water has a diverse range of water source supplies in its region, the three largest being the Otways system (Arkins Creek Catchment and Gellibrand River), the Grampians system and the Dilwyn Aquifer. The Otways and Grampians systems have water storages and transportation pipelines, whereas the Dilwyn Aquifer supplies directly to local treatment plants. 

The towns of Portland, Port Fairy, Heywood, Dartmoor, Port Campbell, Timboon and Peterborough are supplied from deep bores extracting water from the Dilwyn Aquifer. This aquifer serves as the storage for these water supply systems.

In the Warrnambool region, water is sourced from the Otway National Park and Wannon Water has eight storages with a total capacity of 2163ML. Please see the below graph for current storage levels.

The water supply for Hamilton, Tarrington, Dunkeld and Glenthompson is piped from the Grampians National Park to three storages with a total capacity of 4786ML and two small basins with a total capacity of 2722ML. The graph below shows current storage information.