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Greater Wellington has prepared a Water Allocation Plan for the Mangatarere Catchment. The Mangatarere catchment, northwest of Carterton is an important water resource for the Region and includes the Mangatarere Stream and its four tributaries. It provides water for farming activities, contributes to the Carterton District water supply, is significant as a trout spawning habitat, and supports a number of indigenous fish species. It also provides recreational enjoyment, primarily in the form of fishing. In addition, it plays an important part in the dilution of the Carterton District Council sewage discharge.

Studies have revealed that flows in the Mangatarere may be  compromising the life supporting capacity of the catchment under both natural conditions and when water takes are being taken. This plan has been prepared to ensure the careful use of water in the catchment whilst also providing for the ecology, recreation and other values associated with the streams in the catchment.