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For a country where droughts are a regular weather feature and there is growing pressure on metropolitan water supply systems, relatively few rainwater and greywater systems are being installed. Both types of systems are held back through cost issues, lack of knowledge, health concerns and, in some areas, local authority regulations.

The Harnessing rainwater and greywater BRANZ Facts series looks at the methods and benefits of such systems and what is holding them back. A second BRANZ Facts series looks at residential water use.