Trentham is one of the fastest growing areas in our region. This project will help us to find additional water sources so that we can plan for the future, meet the growing demand and manage any water quality risks.

The town is currently supplied by a natural spring and the Trentham groundwater system.

The need to augment the supply at Trentham was highlighted in our Urban Water Strategy, our 50-year plan to secure water for future generations.

We have been carrying out groundwater investigations since February 2018 and found a suitable bore site within our plant and installed a 126-metre bore.

The bore is artesian and is screened in the Bedrock Aquifer which underlies the Basalt Aquifer in the area that most other groundwater users extract from.

Our tests concluded there would be no impact to surrounding groundwater users or the environment. We continue to work with Goulburn-Murray Water to satisfy the licensing requirements

We are conducting further pumping tests on groundwater bores at its Trentham Water Treatment Plant.

The tests will start on Tuesday 11 May 2021 and continue for around one week.

The tests will provide information on water quality and a sustainable pump rate.

The Coliban Urban Water Strategy 2017 identified a shortfall at Trentham of up to 122 megalitres by 2040.

In 2019, we obtained an additional licence volume of 55 megalitres per year.

Last year we installed additional bores at the water treatment plant to increase the flow rate and establish a groundwater monitoring network so we can measure any changes in groundwater level and quality over time.

This information will support our application to Goulburn-Murray Water, the groundwater manager of the region, to increase our licence volume by a further 62 megalitres per year.

For further information our Water Resources Manager Brendan Cossens on 1300 363 200.

We are carrying out drilling works at our Trentham Water Treatment Plant on Lagoon Road to construct two additional bores as part of Trentham Groundwater Project.

The works started on Monday 4 May 2020 and are expected to be completed within two weeks.

We are drilling a slightly larger bore close to the existing bore to improve the flow rate and establish monitoring to measure any changes in groundwater levels and quality over time.

We will also drill another Bedrock Aquifer bore near our existing Basalt Aquifer monitoring bore on Bergs Lane.


  • Timeline item 1 - complete

    Stage 1

    February 2018

    Works began

  • Timeline item 2 - complete

    Stage 2

    December 2018

    We applied to GMW to amend our existing groundwater licence in Trentham to include 2 new bores and increase the licence volume by 220 megalitres a year.

  • Timeline item 3 - complete

    Stage 3

    November 2019

    Our application to increase the volume of our existing groundwater licence by 55 megalitres per year was approved by GMW.

  • Timeline item 4 - complete

    Stage 4

    January 2020

    Our application to increase the volume of our existing groundwater licence by 55 megalitres per year was approved by GMW.

  • Timeline item 5 - complete

    Stage 5

    May 2021

    We conducted pumping tests on bores at our Trentham Water Treatment Plant. The pumping tests yielded promising results.

    We provided the test results to Goulburn-Murray Water to support our application to amend our existing licence to take and use groundwater.

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