Provincial (Stream) Water Quality Monitoring Network

Provides stream water quality monitoring data for a number of parameters, including total and dissolved nutrients, metals, and chloride.

The Provincial (Stream) Water Quality Monitoring Network (PWQMN) measures water quality in rivers and streams across Ontario. This dataset provides stream water quality monitoring data for a number of parameters, including total and dissolved nutrients, metals, and chloride. Spatial information for stream monitoring locations across Ontario are also available.

Keywords: Streamwater, Nutrients, Fresh Water

Stream Water Quality Map

Ministry contact: Environmental Monitoring and Reporting Branch

Additional information

Tags
Geographic coverage
Ontario
Maintainer
Environmental Monitoring and Reporting Branch
Update frequency
Yearly

Provincial (Stream) Water Quality Monitoring Network

Learn more about accessing data using different formats.

Date range: January 1 - December 31, 2024

  • CSV
    Data 2024 English

    Last Updated: August 27, 2025

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  • CSV
    Field Data 2024 English

    Last Updated: August 27, 2025

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Date range: January 1 - December 31, 2023

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    Data 2023 English

    Last Updated: June 18, 2025

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    Field Data 2023 English

    Last Updated: June 18, 2025

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Date range: March 1, 2021 - December 31, 2022

  • CSV
    Data English

    Last Updated: January 19, 2024

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  • CSV
    Field Data English

    Last Updated: September 2, 2025

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  • CSV
    Parameter Lookup English

    Last Updated: July 28, 2025

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Date range: January 1, 1964 - December 31, 2021

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    Data 2019-March 2021 English

    Last Updated: April 20, 2023

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    Data 2010-2018 English

    Last Updated: April 20, 2023

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  • CSV
    Data 2000-2009 English

    Last Updated: April 20, 2023

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  • CSV
    Data 1995-1999 English

    Last Updated: July 3, 2025

    Provides stream water quality monitoring data for a number of parameters,...

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  • CSV
    Data 1990-1994 English

    Last Updated: July 3, 2025

    Provides stream water quality monitoring data for a number of parameters,...

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  • CSV
    Data 1985-1989 English

    Last Updated: July 3, 2025

    Provides stream water quality monitoring data for a number of parameters,...

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  • CSV
    Data 1980-1984 English

    Last Updated: July 3, 2025

    Provides stream water quality monitoring data for a number of parameters,...

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  • CSV
    Data 1976-1979 English

    Last Updated: July 3, 2025

    Provides stream water quality monitoring data for a number of parameters,...

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  • CSV
    Data 1970-1975 English

    Last Updated: July 3, 2025

    Provides stream water quality monitoring data for a number of parameters,...

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  • CSV
    Data 1964-1969 English

    Last Updated: July 3, 2025

    Provides stream water quality monitoring data for a number of parameters,...

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Supporting Files

  • PDF
    Metadata English

    Last Updated: January 19, 2023

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  • PDF
    Metadata French

    Last Updated: January 19, 2023

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  • CSV
    Coordinates English

    Last Updated: April 4, 2023

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  • XLSX
    Method Codes English

    Last Updated: July 28, 2025

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  • XLSX
    Code de méthode French

    Last Updated: July 28, 2025

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  • XLSX
    Remark Value Qualifiers English

    Last Updated: July 28, 2025

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  • XLSX
    Qualificatifs de valeur de remarque French

    Last Updated: July 28, 2025

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