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Onsite disposal of wastewater

This guidance explains the legislation that covers the design and installation of on-site wastewater disposal systems.

This information was confirmed as current in February 2016. It originally appeared in Codewords newsletters prior to January 2014.

More details

Wastewater, called ‘foul water’ in the Building Code, is the discharge from sanitary fixtures and appliances in buildings.


  • Published on 1 June 2011
  • Of interest to Drainlayers, Owners, Building consent authorities, Builders, Designers
  • 1st edition

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: