The water treatment plant was built in 1995. The plant has a design capacity of up to 28,000 litres daily, but typically treats around 10,000 litres on average.

Pirinoa water treatment plant supplies water to the Pirinoa township – around 8 properties, and a school.

The water supplied to Pirinoa is taken from one bore, and is treated using ozone, filtration, UV and chlorine and is then stored in two storage tanks. The treated water is then pumped into the town pipe network.

Supply from Pirinoa accounts for less than 0.2 percent of South Wairarapa’s total water supply volume in a typical year.