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Tweed Shire Council has issued a red alert for blue-green algae at Clarrie Hall Dam following its latest water test results.
This red alert means that the water should be treated as toxic to both humans and animals, and should not be consumed without being treated.
Council's Manager Water and Wastewater Operations Brie Jowett said the water is also potentially unsafe to come into contact with the water.
"The blue-green algal bloom at the dam is increasing rapidly," she said.
"While there is no musty odour to the dam water or visible clumps of scum, our test results indicate blue-green algae levels are at the highest red alert level."