Lake Moondarra Capacity
Friday 24 July 2015 – 58.3%


Lake Julius Capacity
Friday 24 July 2015 – 87.7%

 Blue Gree Algae Level

Blue Green Algae Level - Low

Level: Medium
Date Sampled: 15 June 2015

 Open Data

The Mount Isa Water Board is committed to the Queensland Government’s Open Data initiative.

The Board has developed an Open Data Strategy detailing our data assessment processes and identifying data planned for release and the release schedule. The strategy reinforces our commitment to making a range of information available to the community.

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Where does our raw water come from?

Mount Isa’s raw water is supplied from either Lake Moondarra or Lake Julius. Lake Moondarra is 13 km away from Mount Isa and Lake Julius is more than 60km away. In normal conditions, all water is supplied from Lake Moondarra. However, when there is a drought, water is also supplied from Lake Julius.

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What is the Mount Isa Water Board’s main function?

The Mount Isa Water Board’s main function is to carry out bulk water-related activities for Mount Isa.

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How much water do we use?

Each year the Mount Isa Water Board supplies approximately 20 gigalitres of water to its major customers. This is 20,000 million litres and equivalent to 8,000 Olympic swimming pools.

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How does the Mount Isa Water Board supply the water?

The Mount Isa Water Board has a network of pump stations, pipelines and power distribution systems from Lake Julius to Lake Moondarra to Mount Isa. The Mount Isa Water Board supplies the major customers’ storage tanks with treated water when the tank levels drop below a certain point.

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Why do we have a filtration system? What happened to Clear Water Lagoon?

In late 2013, a significant blue-green algae bloom caused Clear Water Lagoon’s natural filtration process to fail. This resulted in the water in the lagoon being unsuitable for Mount Isa Water Board to supply to Mount Isa City Council for use by the Mount Isa community without subsequent filtration.

The blue-green algae bloom in Clear Water Lagoon has grown to be potentially the largest ever recorded in a Queensland water supply system. Levels of blue-green algae have risen to never before seen levels of more than 5.3 million cells per millilitre (as at 9 February 2015) — 10,000 cells per millilitre is considered normal and acceptable.

As there was no likelihood that the algae bloom could be resolved within a suitable timeframe, the Mount Isa Water Board urgently sourced a filtration system as an interim measure to ensure the continued supply of clean water to Mount Isa City Council.

While investigations are currently being undertaken into the future of Clear Water Lagoon, the Mount Isa Water Board now considers a filtration system essential to future operations. Recent events have demonstrated that Clear Water Lagoon can no longer be relied on to the extent it has been in the past and will not be able to meet the process assurance requirements of modern drinking water standards.

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