Elevated levels of toxic algae have now been found in the Waimea Stream at Mandeville.

This follows Environment Southland declaring the toxic algae had been found on the 8th August in the Longridge Stream at Sandstone, Balfour.

Algae naturally occur in waterways when water flows are low and stable and while more likely during fine conditions, the algae can also bloom in colder months.

Most algae are harmless, however some species can produce toxins and rapidly bloom to high levels.

Toxic algae is commonly identified in rivers and streams as a dark green/brown slime on rocks, or dark brown/black mats at the water’s edge.

Environment Southland senior scientist Katie Blakemore said these algae can produce toxins that are harmful to people and animals if swallowed, or through contact with skin."

"People should keep dogs on a lead and children away from affected areas."

"It is important to be mindful of the potential health risks, until health warnings are removed.”

If you experience health symptoms after contact with contaminated water, visit a doctor immediately.

If you are concerned that any animals have consumed toxic algae or contaminated water, they should be taken to a vet immediately.