Sewage treatment

Invercargill has two sewage treatment plants, Clifton Wastewater Treatment Plant and Bluff Wastewater Treatment Plant, and an oxidation pond at Omaui.

The treatment plants operate automatically and are monitored by qualified staff and technicians, including the support and expertise of the Clifton Laboratory and its chemists.

Clifton, Bluff, Omaui and the biosolids project

• Clifton

  All of Invercargill’s and Otatara’s residential and industrial sewage and wastewater is piped to the Clifton Wastewater Treatment Plant for treatment.

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• Clifton sediment monitoring

  This report summarises the results of the second year of baseline estuary sediment monitoring as required by the Invercargill City Council’s (ICC) consent to discharge treated wastewater to the New River Estuary.

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• Biosolids project

  The picture gallery on this page shows the steps in processing sludge to biosolids, and the application of biosolids to land.

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• Bluff plant

  The Bluff Treatment Plant operates automatically and is controlled through a radio link to staff at the Clifton plant.

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• Omaui treatment

  Omaui sewage is treated in an oxidation pond.

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