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Dunedin City Council – Kaunihera-a-rohe o Otepoti

Dunedin's seven wastewater treatment plants service communities ranging in size from 100 to 83,000.

The DCC collects, treats and disposes of the city’s wastewater (sewage). The wastewater network comprises 901km of pipes, 76 reticulation pumping stations, 130 domestic pumping stations and seven wastewater treatment plants. The network serves around 107,000 residents.

Wastewater reticulation began in the late 1800s when combined wastewater and stormwater systems were installed in central Dunedin and Port Chalmers. Raw sewage discharged directly into the Otago Harbour and, from 1908, into the sea at Lawyers Head. The separation of stormwater and wastewater networks began in the 1960s and was finished in the 1990s.

The main Tahuna and Green Island treatment plants have been significantly upgraded, and the marine outfall pipelines off St Kilda and Waldronville beaches extended. Since 2000, all of Dunedin and Mosgiel’s treated wastewater has been discharged out to sea.

Smaller plants serve Middlemarch, Seacliff, Waikouaiti/Karitane and Warrington.

This section provides information on:

  • the DCC’s wastewater system
  • the Allanton wastewater scheme
  • drainage pipe ownership and responsibilities
  • discharges of trade waste to the wastewater network
  • overflows from the wastewater network into the environment
  • environmental monitoring and beach water quality
  • what to do if you smell odours from the wastewater system.

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