DEECA Victorian Water Accounts 2023-24

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 632,000 customers via 3 separate water supply systems.

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

2023-24 overview

Urban deliveries

134,147 ML of urban residential and non-residential deliveries were made in 2023-24, more than the previous year (119,781 ML).

Wastewater recycled at treatment plants

43% of wastewater was recycled (7,389 ML of 17,200 ML), more than 30% in 2022-23.

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	121,663	67,570	43,670	0	10,423	0	121,663	0	91%
Main integrated system ²	2,324	26,332	14,719	8,157	266	3,495	0	26,637	2,018	86%
Myrniong ³	0	44	17	14	0	12	0	44	0	72%
Total 2023-24	2,324	148,039	82,306	51,841	266	13,930	0	148,344	2,018
Total 2022-23	2,177	133,694	77,175	42,606	462	13,242	61	133,547	2,324

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	121,663	67,570	43,670	0	10,423	0	121,663	0	91%
Main integrated system ²	2,324	26,332	14,719	8,157	266	3,495	0	26,637	2,018	86%
Myrniong ³	0	44	17	14	0	12	0	44	0	72%
Total 2023-24	2,324	148,039	82,306	51,841	266	13,930	0	148,344	2,018
Total 2022-23	2,177	133,694	77,175	42,606	462	13,242	61	133,547	2,324

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	C	5,669	0	5,669	0	7	168	1,205	0	17	1,397	25%	0	4,032	0	240
Parwan (Bacchus Marsh) treatment plant ²	C	937	100	1,037	0	0	0	33	1,002	0	1,035	100%	2	0	0	0
Riddells Creek treatment plant ³	C	124	0	124	0	7	0	0	63	7	77	62%	0	0	41	6
Melton treatment plant ⁴	A,C	6,191	0	6,191	340	0	161	0	3,132	286	3,919	63%	0	0	1,909	363
Romsey treatment plant ⁵	C	475	14	489	0	4	16	0	300	0	319	65%	0	0	170	0
Woodend treatment plant ⁶	C	280	11	291	0	8	33	0	0	0	41	14%	28	0	222	0
Sunbury treatment plant ⁷	B	2,649	0	2,649	0	55	279	0	209	0	543	20%	0	0	2,013	93
Gisborne treatment plant ⁸	B	750	0	750	0	21	27	0	9	0	58	8%	0	0	683	9
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
Total 2022-23		17,572	1,249	18,821	432	108	519	1,141	2,932	511	5,642	30%	8	4,433	8,033	705

Wastewater treatment plant	Class of water	Inflows to plant (ML)	Recycled water end use (ML)	Total water recycled (ML)
Altona treatment plant ¹	C	5,669	0	5,669	0	7	168	1,205	0	17	1,397	25%	0	4,032	0	240
Parwan (Bacchus Marsh) treatment plant ²	C	937	100	1,037	0	0	0	33	1,002	0	1,035	100%	2	0	0	0
Riddells Creek treatment plant ³	C	124	0	124	0	7	0	0	63	7	77	62%	0	0	41	6
Melton treatment plant ⁴	A,C	6,191	0	6,191	340	0	161	0	3,132	286	3,919	63%	0	0	1,909	363
Romsey treatment plant ⁵	C	475	14	489	0	4	16	0	300	0	319	65%	0	0	170	0
Woodend treatment plant ⁶	C	280	11	291	0	8	33	0	0	0	41	14%	28	0	222	0
Sunbury treatment plant ⁷	B	2,649	0	2,649	0	55	279	0	209	0	543	20%	0	0	2,013	93
Gisborne treatment plant ⁸	B	750	0	750	0	21	27	0	9	0	58	8%	0	0	683	9
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
Total 2022-23		17,572	1,249	18,821	432	108	519	1,141	2,932	511	5,642	30%	8	4,433	8,033	705

Nearby water corporations

Central Highlands Water

Explore the Central Highlands Water Corporation local report.

Explore

Goulburn Valley Water

Explore the Goulburn Valley Water Corporation local report.

Explore

Back to water supply map

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

Explore

Greater Western Water

On this page:

In this area

About the area

2023-24 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	C	5,669	0	5,669	0	0	7	168	1,205	0	0	17	1,397	25%	0	4,032	0	240
Parwan (Bacchus Marsh) treatment plant ²	C	937	100	1,037	0	0	0	0	33	1,002	0	0	1,035	100%	2	0	0	0
Riddells Creek treatment plant ³	C	124	0	124	0	0	7	0	0	63	0	7	77	62%	0	0	41	6
Melton treatment plant ⁴	A,C	6,191	0	6,191	0	340	0	161	0	3,132	0	286	3,919	63%	0	0	1,909	363
Romsey treatment plant ⁵	C	475	14	489	0	0	4	16	0	300	0	0	319	65%	0	0	170	0
Woodend treatment plant ⁶	C	280	11	291	0	0	8	33	0	0	0	0	41	14%	28	0	222	0
Sunbury treatment plant ⁷	B	2,649	0	2,649	0	0	55	279	0	209	0	0	543	20%	0	0	2,013	93
Gisborne treatment plant ⁸	B	750	0	750	0	0	21	27	0	9	0	0	58	8%	0	0	683	9
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
Total 2022-23		17,572	1,249	18,821	0	432	108	519	1,141	2,932	0	511	5,642	30%	8	4,433	8,033	705