Shellfish gatherers are being warned not to collect kaimoana from the coast on the east of New Plymouth, when maintenance is done on the city's sewage treatment plant.
From Sunday, May 22, a bioreactor basin at the New Plymouth Wastewater Treatment Plant will be offline for up to 14 days.
"During this period we recommend, as a precautionary approach, to not collect shellfish from the area," said New Plymouth District Council infrastructure quality and compliance business partner Jason Bevan.
"Warning signs will be at Fitzroy Beach, the Waiwhakaiho River mouth, Te Hēnui River mouth and Bell Block Beach recommending no shellfish be collected during this time."