Part of northern Waikato has been issued a section 70 order, requiring people who live or work there to stay at home.

The move was announced at today's post-Cabinet media conference by Director of General of Health Dr Ashley Bloomfield.

Bloomfield said he was issuing a section 70 order requiring people who live or work in the area around Mangatangi, in northern Waikato, to stay at home. Ardern said it was effectively a "bespoke level 4".

Bloomfield said the order was for people living in an area north of SH2 centred on Mangatangi.

"That will effectively extend the road boundary to the east of Maramarua ... and also to the southeast of Miranda on the Firth of Thames."

Meanwhile, residents in the area have turned out in force to get tested for Covid-19, after three people in the area tested positive.

At least 250 people had been tested by midday at a pop-up testing centre at Wharekawa Marae, just up the road from Kaiaua.