DEECA

About groundwater

Groundwater is found in the spaces and fractures in rock and sediment beneath the ground’s surface, known as aquifers. Groundwater held in an aquifer can be pumped to the surface for use.

This page reports on statewide groundwater use, entitlements and compliance, and trade for 2022-23.

We report on groundwater availability and use across two different reporting units: groundwater catchments and groundwater management units (GMUs). These can be found in the groundwater local reports.

Victoria has 20 groundwater catchments, 8 in the north and 12 in the south.

Within groundwater catchments, GMUs are typically smaller management units that are either water supply protection areas (WSPAs) or groundwater management areas (GMAs). There are 54 GMUs: 44 are GMAs and 10 are WSPAs.

Groundwater resources that are licensed and used outside a WSPA or GMA are reported as outside management units.

More information:

2022-23 overview

Restrictions on use

There were fewer restrictions on groundwater use than the previous year.

GMU changes

There was one gazetted change to GMUs - the Glenelg WSPA was abolished.

Water use

Less groundwater was taken for consumptive purposes than the previous year.

In 2022-23:

  • there were more rising and fewer declining groundwater level trends than the previous year
  • there were 3 GMUs that were subject to restrictions on groundwater use, one fewer than during the previous year
  • there was one gazetted change made to GMUs - Glenelg WSPA was abolished in August 2022. All licences in this area are now managed and reported as outside management units
  • a similar volume of groundwater was available to take under entitlements as the previous year
  • there was less groundwater taken for consumptive purposes than the previous year
  • there were fewer temporary and permanent trades of groundwater take and use licences than the previous year.

Groundwater systems are dynamic and adjust continually to short-term and long-term changes in climate, groundwater withdrawal, and land use. Groundwater trends are one type of measure that can give an indication of the condition of the groundwater resource, somewhat similar to storage levels for surface water. Trends in groundwater levels reflect differences between the amount of water flowing into (recharge) and out of (discharge or extraction) an aquifer.

For more information on why we report on groundwater levels, see Keeping track of Victoria’s water.External Link

In the Accounts, groundwater level trends for GMUs have been determined based on monitoring data from key bores in the State Observation Bore Network. Trend determinations are made quarterly by comparing each reading to a previous reading in the same season 5 years prior. That is, a summer record is compared to the summer record from 5 years earlier to account for seasonality.

Groundwater resources are actively managed. For more detail on management responses, visit the Goulburn-Murray Water,External Link Grampians Wimmera Mallee WaterExternal Link and Southern Rural WaterExternal Link websites.

In the June quarter of 2022-23, there were more rising and fewer declining groundwater level trends than the previous June quarter.

Of 10 WSPAs, 3 were categorised as stable and 7 as rising, compared to 5 stable, 3 rising and 2 declining in the previous year.

Of 40 GMAs, 17 were categorised as stable, 17 as rising and 6 as declining, compared to 20 stable, 10 rising and 10 declining in the previous year.

Table 1: Groundwater level trends

Response to water availability

The amount of water available for consumptive and environmental uses will vary from year to year. The water entitlement and planning frameworks include mechanisms that come into play when water is scarce. The aim is to conserve and share water between users in response to seasonal variability and water shortages. These mechanisms include restrictions to licence volumes in groundwater systems.

Groundwater licences are all-year licences. Management plans for some GMUs may include water levels that will trigger restrictions to reduce the volume of water users can take under their licence.

Groundwater restrictions

In 2022-23, entitlement holders in 3 GMUs were subject to restrictions on groundwater use, one fewer than during the previous year. Restrictions are expressed as a percentage (below 100%) of the licence volume that the licence holder is allocated for the year. The restrictions were as follows:

  • Campaspe groundwater catchment - Lower Campaspe Valley WSPA, 75%
  • Goulburn Broken groundwater catchment - Katunga WSPA, 70%
  • West Wimmera groundwater catchment - Neuarpur subzone 1 in the West Wimmera GMA, 80%.

Water use

In Victoria, groundwater can be taken from aquifers under entitlements issued and authorised under the Water Act 1989. Generally, water is allocated to either water corporations or to individuals, both of which are issued take and use licences. In addition to this, there is one groundwater bulk entitlement issued to Barwon Water for urban supply to the Greater Geelong area.

The Act also enables individuals to take water for domestic and stock use from groundwater without a take and use licence.

For the most part, use - irrigation/commercial, urban and power generation - of groundwater is metered. Domestic and stock use is estimated based on the number of domestic and stock bores in each GMU and outside management unit.

More information on groundwater accounting and use is detailed in How we account for groundwater.

Total use and use by type

The total groundwater use across the state including domestic and stock use was 217,739 ML, which was less than the volume used in 2021-22 (289,741 ML) (Figure 2 and Table 2).

Please note, the total use and total entitlement volumes are slightly different in Table 2, Table 3 and Figure 3 due to rounding.

Use in groundwater management units (GMAs and WSPAs):

  • There was 832,458 ML of licensed entitlement and 170,711 ML of metered use (compared to 852,788 ML of licensed entitlement and 245,157 ML of metered use in 2021-22)
  • There was 22,675 ML of estimated domestic and stock use (compared to 22,825 ML in 2021-22).

Use in outside management units:

  • There was 116,699 ML of licensed entitlement and 16,800 ML of metered use (compared to 100,524 ML of licensed entitlement and 14,164 ML of metered use in 2021-22)
  • There was 7,553 ML of estimated domestic and stock use (compared to 7,595 ML in 2021-22).

Use by type

In 2022-23, groundwater was used for:

  • irrigation/commercial purposes*: 155,494 ML (71% of total use)
  • urban purposes: 8,276 ML (4% of total use)
  • power generation: 23,741 ML (11% of total use)
  • domestic and stock purposes: 30,288 ML (14% of total use). This estimate is based on a count of 18,058 domestic and stock bores in Victoria that were less than 30 years old (considered to be currently active) in 2022-23 (compared to 18,205 in 2021-22).

* Note: Data for the irrigation and commercial categories are reported together as they cannot be separated for groundwater use.

Figure 2 and Table 2 show the volumes of groundwater use by type.

Table 2: Groundwater diverted for different consumptive uses

Entitlements and compliance

Entitlements

Entitlements provide the basis for how water is shared. The total volume of entitlements changes each year as new entitlements are issued, or existing entitlements are modified. All GMUs have a permissible consumptive volume (PCV), which limits the volume of groundwater that can be allocated. In areas that have reached the PCV and allocated all available groundwater within the limit, no new entitlements are created unless water savings are made, and so there is no net increase in entitlement volume.

More information on groundwater management arrangements is detailed in How we account for groundwater.

Groundwater entitlements and use from each GMA and WSPA are detailed in Table 3.

In 2022-23, the total licensed entitlement volume for Victoria was 949,157 ML. This was slightly lower than the amount available in 2021-22 (953,312 ML).

Available water and take

Total groundwater available under entitlements represents the volume of groundwater that was available to be taken. This item is the sum of: opening carryover, allocation issued and the net trade in or out of water. The level of allocation issued is reduced if there are any restrictions in place.

In 2022-23 (Table 3 and Figure 4):

  • 962,976 ML was available to take under entitlements (962,456 ML in 2021-22)
  • 187,512 ML was taken under entitlements (259,321 ML in 2021-22).

Groundwater entitlement and groundwater taken for consumptive use

In Table 3:

  • permissible consumptive volume (PCV) sets the total volume of groundwater that may be licensed and taken in a GMU. PCVs are declared by the Minister for Water through an order published in the Victoria Government Gazette
  • licensed entitlement volume shows the volume of entitlements for each GMU as at the end of the water year
  • the water available and taken under licenses section show the total volume of groundwater available for extraction during the water year, and the volume of licensed use in GMUs and outside management units. Total water available under entitlements is the sum of: opening carryover, allocation issued and the net trade in or out of water
  • the compliance section shows how much groundwater was taken as a percentage of the PCV and whether there was any licensed entitlement available
  • estimated domestic and stock use is based on the number of domestic and stock bores in each GMU and outside management unit within each water corporation area.

The accounting method is explained further in How we account for groundwater.

Figure 5 shows the licensed entitlement, licensed use and domestic and stock use for the last 5 years.

Table 3: Groundwater entitlements and groundwater taken for consumptive use

Figure 6: Urban groundwater use by groundwater catchment

Figure 6: Urban groundwater use by groundwater catchment
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Figure 7: Irrigation groundwater use by groundwater catchment

Figure 7: Irrigation groundwater use by groundwater catchment
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Compliance

Compliance against groundwater entitlements is reported in these Accounts in 3 areas:

  • entitlement issued: that the volume of entitlements (not applicable for domestic and stock water use) issued in a GMU (either a WSPA or a GMA) does not exceed the PCV or has not increased without appropriate approvals
  • water taken: that the volume of water taken under entitlements during the year does not exceed the total water available to licence holders in that year
  • bulk entitlement provisions: that holders of entitlements do not breach any provisions that are documented in their bulk entitlement orders.

PCV compliance is not assessed in the following 6 GMUs:

  • Rosedale and Stratford GMA: current compliance assessment criteria are not applicable. Coal mine licences are physically located in the area, however due to a lack of clarity about the inter-aquifer behaviour of resources, it is not possible to assign or assess licence volume and extraction against the Rosedale or Stratford GMA PCV.
  • Shepparton Irrigation Region GMA: there is no PCV as there is no limit on the total volume of shallow groundwater entitlement available.
  • South West Limestone GMA: the PCV has not been gazetted. The South West Limestone GMA includes the areas of the former Nullawarre and Yangery WSPAs, and the Hawkesdale and Heywood GMAs, as well as the areas outside the former GMUs but included within the South West Limestone GMA boundary. The PCVs for the 4 GMUs have not been revoked and still apply. PCV volumes are 22,741 ML for Nullawarre, 14,352 ML for Yangery, 16,161 ML for Hawkesdale and 8,500 ML for Heywood.
  • Upper Ovens River WSPA: a PCV is not required because the management plan prevents additional entitlements or an increase in entitlement volume from being issued, except by trade.
  • West Goulburn GMA: there is no PCV, but there are individual zone caps set. The total recorded use in the West Goulburn GMA in 2022-23 was 1,021 ML, 34% of the total licensed volume.

For West Wimmera GMA, Wy Yung GMA, Nepean GMA, Rosedale GMA, Stratford GMA and Wa De Lock GMA, the PCV that applies is the sum of the PCVs for all zones within each GMA.

Key points on compliance against entitlements

Entitlement issued

There was an allowable net increase in the total entitlement volume from the previous year. See note below.

Licensed entitlement volume

The licensed entitlement volume did not exceed the relevant gazetted PCV for each GMU, where compliance can be assessed (explanations under the Compliance section).

Total volume of licensed groundwater

The total volume of licensed groundwater used in each GMU was within the volume available for the year.

Individual bulk entitlements

Individual bulk entitlement holders complied with all provisions in their entitlements.

Note to increase in total entitlement volume:

  • All increases have been made in accordance with the relevant rules and appropriate approvals. See explanations in the groundwater local reports for the Central Victorian Mineral Springs groundwater management area (GMA), Eildon GMA, Rosedale GMA, Upper Ovens River water supply protection area and the West Wimmera GMA.

Trade

Groundwater can be traded via the trade of take and use licences. Outside of declared water systems,External Link take and use licences allow water to be taken from unregulated surface water systems or groundwater to be used on the land defined in the licence.

For further information:

Groundwater trade

Trades as part of land transfers were the most common type of groundwater take and use licence trade.

In 2022-23 (Figure 8 and Table 4):

  • the volume of temporary groundwater trade was 10,956 ML, lower than in the previous year
  • the volume of permanent groundwater trade (not as part of a land transfer) was 1,979 ML, lower than in the previous year
  • most groundwater take and use licence trades were as part of land transfers, with 317 trades amounting to 44,485 ML. This is a lower entitlement volume across a smaller number of trades than in the previous year.

Table 4: Trade of groundwater take and use licences in groundwater management units

In 2022-23, there was a higher volume of groundwater entitlement temporarily traded than permanently traded.

Across the trade types of temporary trade and land transfer, northern Victoria had the highest combined volume traded. For the permanent trade (not as part of a land transfer) type, there was a higher combined volume in southern Victoria. The lowest volume of trade across all trade types was in western Victoria.

There was more trade in groundwater take and use licences than trade in surface water take and use licences during 2022-23. For information on surface water trade, visit Statewide surface water.