Freshwater

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

Rachel Crawford and Paul Franklin inspecting a fish passage on the Waikato River.

Freshwater and Estuaries Update

A seasonal review and outlook for New Zealand's water resources, and an update on NIWA's freshwater research

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    Sediments and hydro

    How may hydro-dams influence sediments in waterways?
    Freshwater quality

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    Altered water flow and hydro

    How do hydro-dams potentially influence water flows?

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    Environmental Information Update

    Publication series
    The latest updates about NIWA's EI work delivered to your inbox in our e-newsletter.
    Freshwater quality
    Tsunami

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    Examples and expertise

    NIWA has wide-ranging expertise in toxicology testing.

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    Standard tests

    NIWA offers both water and sediment tests, using a range of organisms.

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    Mitigation

    Some options to minimise the effects of dams on water quality and mahinga kai.

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    Impacts of geothermal

    How does geothermal energy generation impact water quality and mahinga kai?

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    Mitigation

    Steps to minimise the effects of thermal energy generation on water quality and mahinga kai.

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    Impacts of thermal

    Impacts of thermal energy generation activities on water quality and mahinga kai.

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    Mitigation

    Ways to minimise the effects of hydro-dams on water quality and mahinga kai.

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    How do we gauge the state of New Zealand’s overall water quality?

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    How is water clarity measured and what is its significance?

    Water quality levels are indicated by how well light transmits through water