Blue-green algae alerts at Uki and Bray Park Weir

Tweed's treated water remains safe to drink

Thursday 14 January, 2021

Treated water from the Tweed mains supply remains safe to drink despite alerts for blue-green algae being extended in the Shire.

Today, amber alerts for blue-green algae were issued for the Tweed River at Uki and Bray Park Weir. Last week an amber alert was issued for Clarrie Hall Dam. 

Council testing has shown the level of blue-green algae has quadrupled at the dam in the past week, most likely due to the high level of nutrients washed into the dam by the December rains and continuing hot weather. Despite this, potentially toxic species of blue-green algae currently are not dominant.

The dam is full and spilling to Doon Doon Creek, a tributary of the Tweed River, allowing algae to flow downstream to Uki and Bray Park Weir.

Council draws raw water at Uki to treat at the village's water treatment plant and again at Bray Park Weir to treat for the bulk of the Shire's water customers. 

Council's water treatment processes are designed to remove any potential toxin from blue-green algae. Treatment also removes any taste and odour compounds from the algae.

Council will increase testing to monitor the algal blooms, and adjust its treatment processes as required to ensure the Tweed's drinking water remains safe to drink and pleasant tasting.

Amber alerts mean recreational users of the dam and river should not come into contact with the water and livestock should not drink the water as it could potentially be toxic.

Signs have been placed at popular recreational access points to warn the public of the risks. 

Blue-green algae occur naturally and can reproduce quickly in favourable conditions.

Affected water appears to have a green paint-like scum, near the edges, or greenish clumps throughout the water.

Anyone who thinks they may have been in contact with blue-green algal water is advised to seek medical advice if symptoms appear.

For the latest, visit Council's website at