There have been six new cases of Covid-19 reported in managed isolation facilities since Friday, with no new cases found in the community.
In a statement, the Ministry of Health said the six new imported cases came from Saudi Arabia, India, the USA and Malaysia.
There are 27 active cases in New Zealand and there has been a total of 2312 confirmed cases.
There were three new cases of Covid-19 reported in managed isolation facilities and none in the community on Friday, which was the ministry's last update.
The Ministry also said today that a historical case has been identified, after a mariner returned a weak positive test result before transferring to their vessel.
"The mariner confirmed they had a positive test result overseas earlier in the year and follow up serology testing has confirmed this. If this has not been reported overseas, it will appear in our figures as a historical case."
An update on the wastewater testing was also provided today after weak positive results were detected in Wellington, Christchurch, Rotorua and Queenstown. The Ministry confirming that further testing in Christchurch had returned a negative result, after all the other cities also returned negative results on followup testing.
"The Ministry's assessment is that these weak positive results were likely from recent positive cases in managed isolation or due to recently recovered cases who are not infectious but continue to shed the virus after returning home or while travelling. There is no risk of infection from Covid-19 in wastewater."
In other recent Covid-19 news, churches are being credited with playing a key part in encouraging more Pasifika people to be vaccinated against Covid-19, 10 people have been fined for travelling to New Zealand without proof that they tested negative for Covid-19, and on Friday Covid-19 Response Minister Chris Hipkins said he expected confidence in the vaccine would continue to grow.