Authorities are asking anyone with Covid-19 symptoms in Hawke's Bay, East Cape and Taranaki to get tested today after the virus was detected in wastewater samples taken in Napier, Gisborne and Stratford.
The samples could be from recently recovered cases returning to the region after being in managed isolation, or could signal undetected cases in the community.
There are no MIQ facilities, or known Covid-19 cases self-isolating, in either area.
Stratford Mayor Neil Volzke said the detection of Covid in wastewater is a wake-up call for the region, where 69 per cent of people are double dosed with the Pfizer vaccine.
"I don't think it's a surprise but it's certainly a reality check and when it's on your back door I think everybody wants to sharpen up and make sure they're on board with the vaccination process."
Volzke hopes for a rush in people turning out to get vaccinated and tested today.
And people around the country are being encouraged to get their second dose of the Covid-19 vaccine today, as it is three weeks since Super Saturday.
Nearly 40,000 received their first shot that day, and follow-up vaccination events are happening this weekend.
The biggest event is GotYaDot at Eden Park which will be open for vaccinations from noon till 8pm today and tomorrow.
Anyone who gets vaccinated will get their name on the big screen as well as the opportunity to walk through the rugby players' tunnel.
In Porirua, vaccinations will be administered during a tag football event tomorrow and in New Plymouth tomorrow afternoon a multi-ethnic family fun day is planned.