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.
They protect the quality of lakes, rivers, estuaries and other water bodies.
• Learn More
Learn about water quality standards in your community.
View the Water Quality Standards Where You Live Map to learn more.
Learn about water quality standards and criteria. Learn more about the differences between water quality standards and criteria.
Contact Us to ask a question, provide feedback, or report a problem.