An official website of the United States government.

Due to a lapse in appropriations, EPA websites will not be regularly updated. In the event of an environmental emergency imminently threatening the safety of human life or where necessary to protect certain property, the EPA website will be updated with appropriate information. Please note that all information on the EPA website may not be up to date, and transactions and inquiries submitted to the EPA website may not be processed or responded to until appropriations are enacted.

We've made some changes to EPA.gov. If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Contact Us

Nutrient Pollution Policy and Data

What EPA is Doing to Reduce Nutrient Pollution

The EPA flag flying in front of the Ariel Rios Building in Washington, D.C..


Numeric Nutrient Water Quality Criteria

Progress Toward Clean Water Act Adopted Numeric Nutrient Criteria Map

Tools to Assist States and Tribes

screen shot from the Nitrogen and Phosphorus Data Access Tool.


Nutrient Data

Glass beaker and other measuring instruments falling into clear water.

Reports, Research, and Resources on Nutrient Pollution

Tops of many glass tubes with glass dropper above them.

Contact Us to ask a question, provide feedback, or report a problem.