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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Research

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Tools & Services

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    Estimating deposited fine sediment

    Quorer: a simple method for estimating deposited fine sediment

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    Setting maximum turbidity levels for riverine fish (DSS)

    NIWA research has established turbidity limits to protect fish in New Zealand rivers.

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    Models to help manage erosion

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    Freshwater management tools

    Some of the useful methods, guidelines and modelling tools we've developed to assist with management of freshwaters.

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    Freshwater species and habitat management

    Find out how we can help you with freshwater species and habitat management.

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    Flow assessment and management

    We offer a range of flow assessment and management services.

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    Wastewater treatment

    We can help with wastewater treatment and ecotoxicology.

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    Water quality monitoring and advice

    More information about our water quality monitoring and advice services.

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    Specialist analytical services

    Service
    Find out more about our specialist analytical services.
    Algae
    Ecotoxicology

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    Impacts of meat and dairy processing

    What are the impacts of meat and dairy processing activities on water quality and mahinga kai?

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    Timber

    A range of wood products are produced in Aotearoa.

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    Mitigation

    Here are some simple steps to minimise the effects of riparian vegetation loss on water quality and mahinga kai.