Ecoregional Criteria Documents

Download GIS Data for Level III Ecoregions

Photo of Ecoregions map

The U.S. is divided into 14 distinct eco-regions.

We publish recommended water quality criteria to reduce problems associated with excess nutrients in waterbodies in specific areas of the country. We work with states and tribes to adopt regional-specific and locally appropriate water quality criteria for nutrients in lakes, reservoirs, rivers, streams, and wetlands in fourteen ecoregions.

Criteria Documents

You will need Adobe Reader to view some of the files on this page. See EPA’s About PDF page to learn more.

History

We finalized nine water quality criteria documents for lakes and reservoirs, and rivers and streams. See below for documents and peer review comments.

We solicited submissions of significant scientific information on nine nutrient water quality criteria documents for lakes and reservoirs, and rivers and streams.

We published 17 ecoregional nutrient criteria documents for lakes and reservoirs, rivers and streams, and wetlands. See below for documents.

Top of Page