Taranaki has four cases of Covid-19 in the region.
The fourth case, in Eltham, was confirmed by the Ministry of Health on Saturday evening, and was included in Monday's official case numbers.
At this stage, the case is not linked to any of the three previously reported cases in New Plymouth or Waitara.
The latest case is isolating at home while case investigation work is under way to identify any close contacts and locations of interest and any locations considered high risk to the public will be shared on the Ministry of Health's website.
Pop-up Covid-19 testing stations were set up in Eltham on Sunday and Monday and the Taranaki District Health Board (TDHB) said testing numbers were steady on Sunday across Taranaki.