Potentially toxic blue-green algae has been discovered in Canterbury's Selwyn River, sparking a health warning.
The algae was found in the Selwyn-Waikirikiri River at the Whitecliffs Domain. The algae was also found two weeks ago in the river at Coes Ford.
Exposure to the algae can cause skin rashes, nausea and stomach cramps, Canterbury Medical Officer of Health Dr Alistair Humphrey said.
People should avoid the area until the health warning is lifted.
Selwyn District Council said people and animals should not drink from the river, even if the water is boiled as it does not remove the toxins.
