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Ontario has a comprehensive set of measures and regulations to help ensure the safety of drinking water. The following dataset contains information about the drinking water systems, laboratories and facilities the Ministry of the Environment, Conservation and Parks is responsible for monitoring to ensure compliance with Ontario's drinking water laws. The dataset includes information about: * the number and type of registered systems and laboratories * drinking water quality test results * adverse water quality incidents * activities to support reduced lead in drinking water * enforcement activities related to inspections * orders and convictions * system operator certification
Ministry contact: Environment, Conservation and Parks
Geographic coverage Ontario Last Validated Date December 18, 2025 Update frequency Yearly
Learn more about accessing data using different formats. Date range: April 1, 2024 - March 31, 2025 * ZIP 2024-2025 English Last Updated: December 18, 2025 Explore * ZIP 2024-25 French Last Updated: December 18, 2025 Explore
Date range: April 1, 2023 - March 31, 2024 * ZIP 2023-24 English Last Updated: January 23, 2025 Explore * ZIP 2023-24 French Last Updated: January 23, 2025 Explore
Date range: April 1, 2022 - March 31, 2023 * ZIP 2022-23 English Last Updated: December 14, 2023 Explore * ZIP 2022-23 French Last Updated: December 14, 2023 Explore
Date range: April 1, 2021 - March 31, 2022 * ZIP 2021-22 English Last Updated: December 19, 2022 Explore * ZIP 2021-22 French Last Updated: December 19, 2022 Explore
Date range: April 1, 2020 - March 31, 2021 * ZIP 2020-21 English Last Updated: December 23, 2021 Explore * ZIP 2020-21 French Last Updated: December 23, 2021 Explore
Date range: April 1, 2019 - March 31, 2020 * ZIP 2019-20 English Last Updated: December 21, 2020 Explore * ZIP 2019-20 French Last Updated: December 21, 2020 Explore
Date range: April 1, 2018 - March 31, 2019 * ZIP 2018-19 English Last Updated: December 20, 2019 Explore * ZIP 2018-19 French Last Updated: December 20, 2019 Explore
Date range: April 1, 2017 - March 31, 2018 * ZIP 2017-18 English Last Updated: December 20, 2019 Explore * ZIP 2017-18 French Last Updated: December 20, 2019 Explore
Date range: April 1, 2016 - March 31, 2017 * ZIP 2016-17 English Last Updated: December 20, 2019 Explore * ZIP 2016-17 French Last Updated: December 20, 2019 Explore
Date range: April 1, 2015 - March 31, 2016 * ZIP 2015-16 English Last Updated: December 20, 2019 Explore * ZIP 2015-16 French Last Updated: December 20, 2019 Explore
Date range: April 1, 2014 - March 31, 2015 * ZIP 2014-15 English Last Updated: December 20, 2019 Explore * ZIP 2014-15 French Last Updated: December 20, 2019 Explore
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