Approximately 11 million citizens rely on Lake Erie for drinking water. Clean, safe water is essential to Lake Erie’s vital role in supporting tourism, commercial and recreational fishing, agriculture, and manufacturing.

Under the Great Lakes Water Quality Agreement, the U.S. and Canada, with the Lake Erie states and province, have agreed to work together to reduce the amount of phosphorus entering the western and central basins of Lake Erie by 40 percent (from 2008 levels). ErieStat tracks progress toward this goal. The governments of Michigan, Ohio, and Ontario have further agreed to achieve the reductions for the western basin by the year 2025.


Severity of the 2019 Lake Erie algal bloom. Anything over 4 on the index is considered a “significant” bloom.


Metric tons of total phosphorus reaching Lake Erie in the 2018. The target is 6,000 metric tons per year.

3.2 Million

Acres of land used for agriculture in the Lake Erie basin were influenced by 4R Certified Retailers in 2019.

ErieStat is an online tool that tracks total and dissolved phosphorus entering Lake Erie’s western and central basins from selected tributaries (rivers).

ErieStat also shares the strategies and investments intended to achieve the shared goal of phosphorus reduction in western and central Lake Erie. Download the ErieStat fact sheet here.

More About ErieStat

People living in the Lake Erie basin depend on the lake for drinking water, recreation, and commerce. Find out more about how ErieStat works to track progress toward the shared phosphorus reduction goal, who’s helping, and where we work.