DEECA Victorian Water Accounts 2024-25

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 653,000 customers via 3 separate water supply systems.

More information on the water corporation can be found at Greater Western Water.

2024-25 overview

Urban deliveries

141,423 ML of urban residential and non-residential deliveries were made in 2024-25, similar to the previous year (134,147 ML).

Wastewater recycled at treatment plants

48% of wastewater was recycled (8,310 ML of 17,290 ML), similar to 43% in 2023-24.

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 (%)
Greater Western Water - Central System ²	0	146,315	70,093	46,368	0	15,431	14,423	0	146,315	0	90%
Greater Western Water - Western System ³^{, 4}	2,018	29,339	15,215	9,726	260	0	3,047	2,821	31,069	288	80%
Myrniong ⁵	0	56	13	8	0	0	35	0	56	0	37%
Total 2024-25	2,018	175,710	85,321	56,102	260	15,431	17,505	2,821	177,440	288
Total 2023-24	2,324	148,039	82,306	51,841	266	0	13,930	0	148,344	2,018

Area / town / system	Start volume in store (ML)	Total inflows (ML)	Outflows (ML)	End volume in store (ML)	Distribution system efficiency (%)
Greater Western Water - Central System ²	0	146,315	70,093	46,368	0	15,431	14,423	0	146,315	0	90%
Greater Western Water - Western System ³^{, 4}	2,018	29,339	15,215	9,726	260	0	3,047	2,821	31,069	288	80%
Myrniong ⁵	0	56	13	8	0	0	35	0	56	0	37%
Total 2024-25	2,018	175,710	85,321	56,102	260	15,431	17,505	2,821	177,440	288
Total 2023-24	2,324	148,039	82,306	51,841	266	0	13,930	0	148,344	2,018

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)
Altona treatment plant ¹	A,C	5,577	0	5,577	0	25	468	272	0	16	782	14%	0	4,661	0	134
Parwan (Bacchus Marsh) treatment plant ²	C	1,269	13	1,282	0	0	0	42	1,240	0	1,282	100%	0	0	0	0
Riddells Creek treatment plant ³	C	134	19	153	0	13	0	0	88	14	116	76%	14	0	23	0
Melton treatment plant ⁴	A,C	5,803	202	6,005	719	0	128	0	3,648	354	4,848	81%	0	0	1,157	0
Romsey treatment plant ⁵	C	305	73	378	0	3	12	0	363	0	378	100%	0	0	0	0
Woodend treatment plant ⁶	C	257	42	299	0	16	48	0	0	0	64	21%	53	0	182	0
Sunbury treatment plant ⁷	B	2,734	0	2,734	0	97	286	0	278	0	661	24%	0	0	1,964	109
Gisborne treatment plant ⁸	B	840	22	862	0	26	54	0	40	59	179	21%	0	0	683	0
Total 2024-25		16,919	371	17,290	719	180	996	314	5,657	443	8,310	48%	67	4,661	4,009	243
Total 2023-24		17,075	125	17,200	340	102	684	1,238	4,715	310	7,389	43%	30	4,032	5,038	711

Wastewater treatment plant	Class of water	Inflows to plant (ML)	Recycled water end use (ML)	Total water recycled (ML)
Altona treatment plant ¹	A,C	5,577	0	5,577	0	25	468	272	0	16	782	14%	0	4,661	0	134
Parwan (Bacchus Marsh) treatment plant ²	C	1,269	13	1,282	0	0	0	42	1,240	0	1,282	100%	0	0	0	0
Riddells Creek treatment plant ³	C	134	19	153	0	13	0	0	88	14	116	76%	14	0	23	0
Melton treatment plant ⁴	A,C	5,803	202	6,005	719	0	128	0	3,648	354	4,848	81%	0	0	1,157	0
Romsey treatment plant ⁵	C	305	73	378	0	3	12	0	363	0	378	100%	0	0	0	0
Woodend treatment plant ⁶	C	257	42	299	0	16	48	0	0	0	64	21%	53	0	182	0
Sunbury treatment plant ⁷	B	2,734	0	2,734	0	97	286	0	278	0	661	24%	0	0	1,964	109
Gisborne treatment plant ⁸	B	840	22	862	0	26	54	0	40	59	179	21%	0	0	683	0
Total 2024-25		16,919	371	17,290	719	180	996	314	5,657	443	8,310	48%	67	4,661	4,009	243
Total 2023-24		17,075	125	17,200	340	102	684	1,238	4,715	310	7,389	43%	30	4,032	5,038	711

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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Select a water corporation from the urban, rural or common maps.

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Greater Western Water

On this page:

In this area

About the area

2024-25 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

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	Total 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	A,C	5,577	0	5,577	0	0	25	468	272	0	0	16	782	14%	0	4,661	0	134
Parwan (Bacchus Marsh) treatment plant ²	C	1,269	13	1,282	0	0	0	0	42	1,240	0	0	1,282	100%	0	0	0	0
Riddells Creek treatment plant ³	C	134	19	153	0	0	13	0	0	88	0	14	116	76%	14	0	23	0
Melton treatment plant ⁴	A,C	5,803	202	6,005	0	719	0	128	0	3,648	0	354	4,848	81%	0	0	1,157	0
Romsey treatment plant ⁵	C	305	73	378	0	0	3	12	0	363	0	0	378	100%	0	0	0	0
Woodend treatment plant ⁶	C	257	42	299	0	0	16	48	0	0	0	0	64	21%	53	0	182	0
Sunbury treatment plant ⁷	B	2,734	0	2,734	0	0	97	286	0	278	0	0	661	24%	0	0	1,964	109
Gisborne treatment plant ⁸	B	840	22	862	0	0	26	54	0	40	0	59	179	21%	0	0	683	0
Total 2024-25		16,919	371	17,290	0	719	180	996	314	5,657	0	443	8,310	48%	67	4,661	4,009	243
Total 2023-24		17,075	125	17,200	0	340	102	684	1,238	4,715	0	310	7,389	43%	30	4,032	5,038	711