Lake Erie Nutrients

To prevent harmful algal blooms and formation of low oxygen “dead zones” in Lake Erie, the U.S. and Canada are working in partnership to reduce the amount of phosphorus entering the lake.  

About Annex 4 

The Great Lakes Water Quality Agreement Nutrients Annex (Annex 4) is a commitment between the U.S. and Canada to manage nutrients in the Great Lakes.

Domestic Action Plans

Domestic Action Plans are the “road map” for phosphorus control efforts undertaken by states, provinces, and both federal governments.

Status and Progress

The U.S. and Canada are tracking progress under the Domestic Action Plans to achieve water quality goals.