Waiheke Island has confirmed its first local COVID-19 case.
It comes after wastewater testing on the island also returned an unexpected positive result at the weekend.
Local board chair Cath Handley says the resident tested positive at the local Ostend Medical Centre.
"Just as we welcome our wonderful local shops opening again and following our second positive COVID-19 wastewater test result in the weekend, I am sorry to confirm that we now have our first positive local COVID case," she said in a Facebook post on Monday night.
"It is important to know that public health has been phoning that resident's own contacts and those people have been great at responding and stepping up to get tested today."
Handley told Newshub residents needed to be vigilant.
"It is a first positive test of a local that we are aware of - certainly the first positive test done on Waiheke," she said.
The first official COVID-19 case was recorded on Waiheke Island late last month - but they were tested on the mainland before travelling to the island.