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Dam safety requirements

Owners of classifiable dams (dams over a certain size) must meet requirements to ensure their dam is safe. The requirements are set out in the Building (Dam Safety) Regulations 2022.

A dam is classifiable if it has a height of 4 or more metres and stores 20,000 or more cubic metres volume of water or other fluid.

The regulations ensure that classifiable dams are well operated, maintained and regularly monitored. They also ensure that potential impacts of dam incidents and failures are reduced, protecting people, property, and the environment.

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This information is published by the Ministry of Business, Innovation and Employment’s Chief Executive. It is a general guide only and, if used, does not relieve any person of the obligation to consider any matter to which the information relates according to the circumstances of the particular case. Expert advice may be required in specific circumstances. Where this information relates to assisting people: