The New Plymouth Wastewater Treatment Plant was built in 1984 and is located in the eastern area of New Plymouth.
The plant takes raw sewage and trade wastes from New Plymouth City, Bell Block, Inglewood, Waitara and Oakura. It uses a biological treatment process known as activated sludge aeration to produce a high quality effluent. The clean effluent is discharged to the Tasman Sea via a 480m ocean outfall.
The quality of the water leaving the plant is one of the cleanest in New Zealand and well within the New Zealand standard for safe swimming and seafood gathering.