Auckland Council is investigating the water quality of a West Auckland stream after a young boy reportedly started vomiting and his family's dog had seizures less than 12 hours after playing in the Kakamatua Inlet.
However, it is yet to be confirmed exposure to the water had caused the illness.
The boy's mother, who asked not to be named, raised concerns about the issue in a post on the Parau, Cornwallis and Huia community Facebook page, Fairfax reported.
She said her son and her golden labrador became sick after they, along with the boy's siblings, paddled at the Manukau Harbour stream on Wednesday.
Her son fell and got a face full of water while playing, the woman wrote.