Information on Ecoregional Nutrient Criteria Documents for Rivers and Streams.
You may need a PDF 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, December 2001, EPA 822-B-01-012)
- Ecoregion II: Western Forested Mountains (PDF)(120 pp, 416 K, December 2000, EPA 822-B-00-015)
- Ecoregion III: Xeric West (PDF)(104 pp, 371 K, December 2000, EPA 822-B-00-016)
- Ecoregion IV: Great Plains Grass and Shrublands (PDF)(159 pp, 3 MB, December 2001, EPA 822-B-01-013)
- Ecoregion V: South Central Cultivated Great Plains (PDF)(152 pp, 3 MB, December 2001, EPA 822-B-01-014)
- Ecoregion VI: Corn Belt And Northern Great Plains (PDF)(91 pp, 334 K, December 2000, EPA 822-B-00-017)
- Ecoregion VII: Mostly Glaciated Dairy Region (PDF)(93 pp, 340 K, December 2000, EPA 822-B-00-018)
- Ecoregion VIII: Nutrient-Poor, Largely Glaciated Upper Midwest and Northeast (PDF)(142 pp, 3 MB, December 2001, EPA 822-B-01-015)
- Ecoregion IX: Southeastern Temperate Forested Plains and Hills (PDF)(108 pp, 396 K, December 2000, EPA 822-B-00-019)
- Ecoregion X: Texas-Louisiana Coastal and Mississippi Alluvial Plains (PDF)(140 pp, 3 MB, December 2001, EPA 822-B-01-016)
- Ecoregion XI: The Central and Eastern Forested Uplands (PDF)(99 pp, 359 K, December 2000, EPA 822-B-00-020)
- Ecoregion XII: Southeastern Coastal Plain (PDF)(80 pp, 283 K, December 2000, EPA 822-B-00-021)
- Ecoregion XIV: Eastern Coastal Plain (PDF)(84 pp, 302 K, December 2000, EPA 822-B-00-022)