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

Atmospheric analysis

NIWA has been using advanced scientific instruments to measure atmospheric trace gases and isotopes for over 50 years.

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    Stocktake of diffuse pollution attenuation tools for New Zealand pastoral farming systems

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    Resources

    Guides and other tools

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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?