Developer investigates privatising Mangawhai water supply The Kaipara District Council is unsure how to respond until it completes a feasibility study. Mangawhai’s water supply will be owned and operated by private developers if a proposed pipeline project goes ahead. Mangawhai Central Ltd has approached the Kaipara District Council (KDC) with a proposal to build a pipeline from Langs Beach to Mangawhai, connecting the town to the Whangarei water supply. The Whangarei District Council would sell water to Mangawhai Central, which would then on-sell the water to houses in the Central development, and other suburbs that connect in the future.