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  • » Just click on the left to select the type of report you'd like to generate.

    » Click Upload Data to manage your state or provincial data (for registered data managers only).
For more information on data definitions and agency contact information, browse the links on the left.

About this website              

Welcome to the Great Lakes Regional Water Use Database, providing comparable water use information on withdrawals, diversions and consumptive uses. This database supports the states and provinces in implementing Article 4 of the Great Lakes-St. Lawrence River Basin Water Resources Compact  and Article 301 of the Great Lakes-St. Lawrence River Basin Sustainable Water Resources Agreement.  Under the Compact and the Agreement, the parties (states and provinces) are required to report water use information to the regional database repository and aggregated information will be made available to the public on an annual basis. In 2012, the database was redesigned to comply with the Interim State/Provincial Reporting Protocols to the Regional Water Use Database, adopted by the Regional Body and Compact Council on December 8, 2009.

The Great Lakes Regional Water Use Database has been around for over 20 years! Originally, it was established by the Great Lakes states and provinces in response to the recommendation of the Great Lakes Charter of 1985, which calls for a uniform, consistent base of data of Great Lakes water withdrawals, diversions and consumptive uses. Beginning in 1987, water use data have been submitted to the repository on an annual basis and reports provided to assist the jurisdictions in Great Lakes-St. Lawrence River water resources planning and management.  As specified by the Water Resources Management Committee in its 1987 report, Managing the Waters of the Great Lakes Basin, the database catalogs withdrawals by water use category, sub-basin and jurisdiction.

Database Update

Ontario water use in the regional database has been realigned - the data no longer matches published annual reports.

Ontario has been consistently late in reporting water use data to regional database (i.e., a year behind all other jurisdictions). This caused a misalignment in water use data by year. For example, 2011 water use data for Ontario was included in the 2012 annual report because it was the most current data available.

For the online water use database the 2012, 2013 and 2014 data has been updated so the water use data provided by the province of Ontario aligns with the actual year of water use.

Consequently, the Ontario water use data summarized in the annual reports does not match the Ontario water use data queried through the online database or summarized in web-based report tables. The annual reports reflect the best data available at the publishing date.

If you have questions about this update, please contact Margo Davis at If you have questions about the collection of water use data in Ontario, contact Jonathan Staples at