Ecoregional Nutrient Criteria for Rivers and Streams
These documents present the U.S. Environmental Protection Agency's recommended nutrient criteria for rivers and streams in ecoregions across the country. These recommended criteria are not laws or regulations; they are guidance that states and authorized Tribes may use as a starting point for developing nutrient water quality criteria as part of their water quality standards.
- Ecoregion I: Willamette and Central Valleys (pdf)
- Ecoregion II: Western Forested Mountains (pdf)
- Ecoregion III: Xeric West (pdf)
- Ecoregion IV: Great Plains Grass and Shrublands (pdf)
- Ecoregion V: South Central Cultivated Great Plains (pdf)
- Ecoregion VI: Corn Belt And Northern Great Plains (pdf)
- Ecoregion VII: Mostly Glaciated Dairy Region (pdf)
- Ecoregion VIII: Nutrient-Poor, Largely Glaciated Upper Midwest and Northeast (pdf)
- Ecoregion IX: Southeastern Temperate Forested Plains and Hills (pdf)
- Ecoregion X: Texas-Louisiana Coastal and Mississippi Alluvial Plains (pdf)
- Ecoregion XI: The Central and Eastern Forested Uplands (pdf)
- Ecoregion XII: Southeastern Coastal Plain (pdf)
- Ecoregion XIV: Eastern Coastal Plain (pdf)
- Ecoregional Nutrient Criteria Table for Rivers and Streams (pdf)