Information on Ecoregional Nutrient Criteria Documents for Rivers and Streams.
You will need Adobe Reader to view some of the files on this page. See EPA’s About PDF page to learn more.- Ecoregion I: Willamette and Central Valleys (PDF)(125 pp, 3 MB)
- Ecoregion II: Western Forested Mountains (PDF)(120 pp, 416 K)
- Ecoregion III: Xeric West (PDF)(104 pp, 371 K)
- Ecoregion IV: Great Plains Grass and Shrublands (PDF)(159 pp, 3 MB)
- oregion V: South Central Cultivated Great Plains (PDF)(152 pp, 3 MB)
- Ecoregion VI: Corn Belt And Northern Great Plains (PDF)(91 pp, 334 K)
- Ecoregion VII: Mostly Glaciated Dairy Region (PDF)(93 pp, 340 K)
- region VIII: Nutrient-Poor, Largely Glaciated Upper Midwest and Northeast (PDF)(142 pp, 3 MB)
- Ecoregion IX: Southeastern Temperate Forested Plains and Hills (PDF)(108 pp, 396 K)
- Ecoregion X: Texas-Louisiana Coastal and Mississippi Alluvial Plains (PDF)(140 pp, 3 MB)
- Ecoregion XI: The Central and Eastern Forested Uplands (PDF)(99 pp, 359 K)
- Ecoregion XII: Southeastern Coastal Plain (PDF)(80 pp, 283 K)
- Ecoregion XIV: Eastern Coastal Plain (PDF)(84 pp, 302 K)