A week of positive results for Covid in the wastewater is a "strong indicator that there may be COVID-19 in the Pahiatua community," health authorities say.
Tests had been carried out on November 15 to 18 with only November 17 having a negative result.
Rob Weir, medical officer of health at MidCentral District Health board said water testing had been undertaken across multiple sites in Tararua.
Anyone with Covid-19 symptoms in the rohe were encouraged to get a test.
A walk in testing station had been set up at 46 Main Street, Pahiatua from 9.30am to 3pm until Thursday afternoon.