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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    Mitigation and best practice options

    Some simple steps to minimise the effects of mining activities on water quality and mahinga kai.
    Freshwater

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    Impacts of water dams

    What are the impacts of water dams on water quality and mahinga kai?

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    Riparian vegetation and agriculture

    How may agricultural activities impact riparian vegetation around a waterway?
    Agriculture

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    Emergent

    Find out more about emergent aquatic plants.
    Freshwater

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    Chemical contamination and mining

    What are the potential sources of chemical contamination from mining activities?

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    Toitoi

    One of the most common species of freshwater fish in Aotearoa is the common bully or toitoi.
    Freshwater quality

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    Water resources and mining

    How may the activities of the mining industry influence water resources?
    Freshwater

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    Wood processing

    Trees are grown and converted into a range of useful timber and paper products.

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    Summer Series 8: The forces behind beach ‘foam’

    News article
    06 June 2017
    Freshwater quality

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    What is the proposed activity or industry?

    Various industries and land use activities have the potential to impact on water quality and mahinga kai unless properly managed.

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    Stormwater - an introduction

    Stormwater is a major concern for New Zealand because of its potential effects on the ecological health of our urban streams and coastal waters, as well as on the economic, social and cultural value of these environments.
    Freshwater

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    Azolla fulliculoides

    Free floating species

    Find out more about free floating species.