DEECA Victorian Water Accounts 2022-23

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 Water.

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

Urban systems

Greater Western Water operates 3 urban water supply systems, including 2 sourced from surface water and one that also incorporates groundwater. Water is sourced from the Bunyip, Campaspe, Goulburn, Maribyrnong, Thomson, Werribee and Yarra basins.

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 (%)
City West Water ¹	0	114,194	63,648	40,197	0	10,287	61	114,194	0	91%
Main integrated system ²	2,177	19,455	13,512	2,390	462	2,944	0	19,308	2,324	82%
Myrniong ³	0	45	15	19	0	11	0	45	0	75%
Total 2022-23	2,177	133,694	77,175	42,606	462	13,242	61	133,547	2,324
Total 2021-22	2,337	129,349	76,281	41,561	195	11,454	0	129,491	2,195

Area / town / system	Start volume in store (ML)	Total inflows (ML)	Outflows (ML)	End volume in store (ML)	Distribution system efficiency (%)
City West Water ¹	0	114,194	63,648	40,197	0	10,287	61	114,194	0	91%
Main integrated system ²	2,177	19,455	13,512	2,390	462	2,944	0	19,308	2,324	82%
Myrniong ³	0	45	15	19	0	11	0	45	0	75%
Total 2022-23	2,177	133,694	77,175	42,606	462	13,242	61	133,547	2,324
Total 2021-22	2,337	129,349	76,281	41,561	195	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)	Discharge (ML)
Altona treatment plant ¹	C	6,042	0	0	27	200	1,126	0	18	1,372	23%	0	4,433	0	237
Parwan (Bacchus Marsh) treatment plant ²	C	809	0	0	0	0	15	773	0	788	97%	0	0	0	21
Riddells Creek treatment plant ³	C	146	0	0	5	0	0	51	0	56	39%	2	0	64	24
Gisborne treatment plant ⁴	B	968	267	0	11	5	0	5	267	288	23%	0	0	934	13
Melton treatment plant ⁵	A,C	6,195	733	432	0	104	0	1,823	226	2,584	37%	0	0	4,061	283
Romsey treatment plant ⁶	C	349	249	0	6	13	0	230	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
Woodend treatment plant ⁷	C	344	0	0	5	23	0	0	0	28	8%	6	0	272	38
Sunbury treatment plant ⁸	B	2,719	0	0	54	174	0	50	0	277	10%	0	0	2,383	59
Total 2022-23		17,572	1,249	432	108	519	1,141	2,932	511	5,642	32%	8	4,433	8,033	705
Total 2021-22		16,791	142	316	81	538	1,435	3,207	284	5,862	35%	50	3,834	5,603	1,584

Wastewater treatment plant	Class of water	Inflows to plant (ML)	Recycled water end use (ML)	Discharge (ML)
Altona treatment plant ¹	C	6,042	0	0	27	200	1,126	0	18	1,372	23%	0	4,433	0	237
Parwan (Bacchus Marsh) treatment plant ²	C	809	0	0	0	0	15	773	0	788	97%	0	0	0	21
Riddells Creek treatment plant ³	C	146	0	0	5	0	0	51	0	56	39%	2	0	64	24
Gisborne treatment plant ⁴	B	968	267	0	11	5	0	5	267	288	23%	0	0	934	13
Melton treatment plant ⁵	A,C	6,195	733	432	0	104	0	1,823	226	2,584	37%	0	0	4,061	283
Romsey treatment plant ⁶	C	349	249	0	6	13	0	230	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
Woodend treatment plant ⁷	C	344	0	0	5	23	0	0	0	28	8%	6	0	272	38
Sunbury treatment plant ⁸	B	2,719	0	0	54	174	0	50	0	277	10%	0	0	2,383	59
Total 2022-23		17,572	1,249	432	108	519	1,141	2,932	511	5,642	32%	8	4,433	8,033	705
Total 2021-22		16,791	142	316	81	538	1,435	3,207	284	5,862	35%	50	3,834	5,603	1,584

Nearby water corporations

Central Highlands Water

Explore the Central Highlands Water Corporation local report.

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Goulburn Valley Water

Explore the Goulburn Valley Water Corporation local report.

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Greater Western Water

On this page:

In this area

About the area

2022-23 overview

Urban deliveries

Wastewater recycled at treatment plants

Water deliveries

Urban systems

Table 1: Urban system water balance, Greater Western Water

Recycled water

Table 2: Treated wastewater produced and recycled, Greater Western Water

Nearby water corporations

Central Highlands Water

Goulburn Valley Water

Back to water supply map

Victorian Water Accounts 2022-23

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Wastewater treatment plant	Class of water	Inflows to plant (ML)		Recycled water end use (ML)								Total water recycled (ML)		Discharge (ML)
Wastewater treatment plant	Class of water	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