About the area
Greater Western Water was formed from the integration of Western Water and City West Water on 1 July 2021.
Greater Western Water’s service area covers 3,700 km2, extending from Melbourne’s CBD to Werribee, Bacchus Marsh and the Macedon Ranges.
Greater Western Water services are provided to around 615,000 customers via 3 separate water supply systems.
More information on the water corporation can be found at Greater Western
2022-23 overview
Urban deliveries
119,781 ML of urban residential and non-residential deliveries were made in 2022-23, similar to the previous year (117,842 ML).
Wastewater recycled at treatment plants
32% of wastewater was recycled (5,642 ML of 17,572 ML), similar to 35% in 2021-22.
Water deliveries
Table 1: Urban system water balance, Greater Western Water
| Area / town / system | Start volume in store (ML) | Total inflows (ML) | Outflows (ML) | End volume in store (ML) | Distribution system efficiency (%) | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Urban residential deliveries | Urban non-residential deliveries | Evaporation | Passed to other systems | System losses | Unattributed outflows | Total outflows | |||||
| City West Water 1 | 0 | 114,194 | 63,648 | 40,197 | 0 | 0 | 10,287 | 61 | 114,194 | 0 | 91% |
| Main integrated system 2 | 2,177 | 19,455 | 13,512 | 2,390 | 462 | 0 | 2,944 | 0 | 19,308 | 2,324 | 82% |
| Myrniong 3 | 0 | 45 | 15 | 19 | 0 | 0 | 11 | 0 | 45 | 0 | 75% |
| Total 2022-23 | 2,177 | 133,694 | 77,175 | 42,606 | 462 | 0 | 13,242 | 61 | 133,547 | 2,324 | |
| Total 2021-22 | 2,337 | 129,349 | 76,281 | 41,561 | 195 | 0 | 11,454 | 0 | 129,491 | 2,195 | |
Recycled water
Water recycled at wastewater treatment plants can be used to supplement water available in river basins. Table 2 lists the wastewater treatment plants managed by Greater Western 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.
Table 2: Treated wastewater produced and recycled, Greater Western Water
| Wastewater treatment plant | Class of water | Inflows to plant (ML) | Recycled water end use (ML) | Total water recycled (ML) | Discharge (ML) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Volume treated wastewater produced | Other inflow | Volume supplied to retailers | Domestic / residential | Municipal | Commercial | Industrial | Agriculture | Beneficial allocation | Within process | Total volume recycled | Total % recycled | Released to land | Ocean outfall discharge | Inland water discharge | Other outflow | ||
| Altona treatment plant 1 | C | 6,042 | 0 | 0 | 0 | 27 | 200 | 1,126 | 0 | 0 | 18 | 1,372 | 23% | 0 | 4,433 | 0 | 237 |
| Parwan (Bacchus Marsh) treatment plant 2 | C | 809 | 0 | 0 | 0 | 0 | 0 | 15 | 773 | 0 | 0 | 788 | 97% | 0 | 0 | 0 | 21 |
| Riddells Creek treatment plant 3 | C | 146 | 0 | 0 | 0 | 5 | 0 | 0 | 51 | 0 | 0 | 56 | 39% | 2 | 0 | 64 | 24 |
| Gisborne treatment plant 4 | B | 968 | 267 | 0 | 0 | 11 | 5 | 0 | 5 | 0 | 267 | 288 | 23% | 0 | 0 | 934 | 13 |
| Melton treatment plant 5 | A,C | 6,195 | 733 | 0 | 432 | 0 | 104 | 0 | 1,823 | 0 | 226 | 2,584 | 37% | 0 | 0 | 4,061 | 283 |
| Romsey treatment plant 6 | C | 349 | 249 | 0 | 0 | 6 | 13 | 0 | 230 | 0 | 0 | 249 | 42% | 0 | 0 | 319 | 30 |
| Sunshine Golf Course Sewer Mining Plant treatment plant | n/a | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0% | 0 | 0 | 0 | 0 |
| Woodend treatment plant 7 | C | 344 | 0 | 0 | 0 | 5 | 23 | 0 | 0 | 0 | 0 | 28 | 8% | 6 | 0 | 272 | 38 |
| Sunbury treatment plant 8 | B | 2,719 | 0 | 0 | 0 | 54 | 174 | 0 | 50 | 0 | 0 | 277 | 10% | 0 | 0 | 2,383 | 59 |
| Total 2022-23 | 17,572 | 1,249 | 0 | 432 | 108 | 519 | 1,141 | 2,932 | 0 | 511 | 5,642 | 32% | 8 | 4,433 | 8,033 | 705 | |
| Total 2021-22 | 16,791 | 142 | 0 | 316 | 81 | 538 | 1,435 | 3,207 | 0 | 284 | 5,862 | 35% | 50 | 3,834 | 5,603 | 1,584 | |
