On 1 July 2025, NIWA merged with GNS Science to become Earth Sciences New Zealand.

Freshwater

We provide public information on river, lake, and groundwater conditions across New Zealand including freshwater quantity and quality.

  • Risk assessment of contaminants in traditional food sources

    Research Project
    Gathering, eating and sharing wild kai (food) has always been a very important part of Māori culture and wellbeing - this research project aimed to characterise the risks associated with consuming kai collected from rivers, lakes and coastlines.
  • Framework for interoperable freshwater models

    Research Project
    This project involves the development of a computer-based framework for freshwater models. The framework will be tested to proof-of-concept stage.
  • NIWA Fish Tagging - Giant Kokopu

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    Sign up for the Freshwater and Estuaries Update

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    USC model requirements and outputs

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    Stocking fish

    Low recruitment could also be caused by widespread depletion of stocks
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    Restoring fish passage

    The movements of many juvenile native fish are often hindered by barriers to fish passage such as dams, weirs, falls, tide gates, culverts, screens and high water velocities. The New Zealand Fish Passage Guidelines sets out recommended practice for the design of instream infrastructure to provide for fish passage.
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    Improving water quality

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    Contacts

    Whom to contact for further information.
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    Sediment and wind

    How may wind energy generation activities influence sediments in waterways?
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    Water take and geothermal

    How do geothermal energy generation activities potentially influence water flows?
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    Water temperature and geothermal

    What are the impacts of geothermal energy generation activities on water temperatures?