Residents are confused why there've been no details about the area's positive case.
"We looked on our phones and couldn't find any places of interest," one resident said.
Newshub spoke to several local employees who said they've been told to get tested for COVID-19 after one of their co-workers tested positive.
It's understood that the case is the positive infection Director-General of Health Ashley Bloomfield confirmed on Wednesday.
But on Thursday, the Government wasn't giving much away during its daily COVID-19 press conference.
"We're working through locations of interest... but the case has links to Auckland," Director of Public Health Caroline McElnay said, before Prime Minister Jacinda Ardern called the next question.
But workers being tested on Thursday were more open.
"We are worried," one worker said.
Newshub has spoken to a manager at the company in question. but he refused to confirm if there had been a positive case of COVID-19. However, Newshub has seen an email sent to staff that tells them they need to be tested and follow the directions about isolating
In a statement on Thursday evening, the Ministry of Health confirmed members of household in Warkworth were in the process of moving to managed isolation following a positive COVID-19 result.
"Public Health is liaising with the workplaces associated with the household and providing advice on testing and self-isolation," the ministry said.
"The general advice for the Warkworth community is that, unless you are informed that you are a contact of one of the household cases, you should just continue adhering to the alert level 4 lockdown guidelines, being vigilant for the signs of COVID-19 and... checking the Ministry of Health's locations of interest webpage for updates."