Treated water is stored in a reservoir and from there is piped to 164 properties, including the Wainui YMCA.

Water for the Wainui water supply scheme is taken from a 92 metre deep well on Wainui Valley Road. Water is pumped out of the well, disinfected with chlorine and also passes through a cartridge filter to remove any suspended material.   

The Wainui water supply scheme is a restricted water supply, which means that each house has its own storage tank which can receive up to 1,000 litres of water per day.