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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
Geographic coverage Ontario Maintainer Environmental Monitoring and Reporting Branch Update frequency Yearly
Learn more about accessing data using different formats. Date range: January 1 - December 31, 2024 * CSV Data 2024 English Last Updated: August 27, 2025 Explore * CSV Field Data 2024 English Last Updated: August 27, 2025 Explore
Date range: January 1 - December 31, 2023 * CSV Data 2023 English Last Updated: June 18, 2025 Explore * CSV Field Data 2023 English Last Updated: June 18, 2025 Explore
Date range: March 1, 2021 - December 31, 2022 * CSV Data English Last Updated: January 19, 2024 Explore * CSV Field Data English Last Updated: September 2, 2025 Explore * CSV Parameter Lookup English Last Updated: July 28, 2025 Explore
Date range: January 1, 1964 - December 31, 2021 * CSV Data 2019-March 2021 English Last Updated: April 20, 2023 Explore * CSV Data 2010-2018 English Last Updated: April 20, 2023 Explore * CSV Data 2000-2009 English Last Updated: April 20, 2023 Explore * CSV Data 1995-1999 English Last Updated: July 3, 2025 Provides stream water quality monitoring data for a number of parameters,... Explore * CSV Data 1990-1994 English Last Updated: July 3, 2025 Provides stream water quality monitoring data for a number of parameters,... Explore * CSV Data 1985-1989 English Last Updated: July 3, 2025 Provides stream water quality monitoring data for a number of parameters,... Explore * CSV Data 1980-1984 English Last Updated: July 3, 2025 Provides stream water quality monitoring data for a number of parameters,... Explore * CSV Data 1976-1979 English Last Updated: July 3, 2025 Provides stream water quality monitoring data for a number of parameters,... Explore * CSV Data 1970-1975 English Last Updated: July 3, 2025 Provides stream water quality monitoring data for a number of parameters,... Explore * CSV Data 1964-1969 English Last Updated: July 3, 2025 Provides stream water quality monitoring data for a number of parameters,... Explore
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