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.  This is a secure water supply, which means the water is free from microbial contamination and no disinfection is required.  Water is pumped out of the well to the treatment plant, where the water 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.