Active Willamette Basin TMDLs: Tualatin Subbasin

2012 and 2001 Tualatin TMDL

The Tualatin TMDL consists of water-quality limits and actions that protect the Tualatin River by controlling nutrients, temperature, bacteria and other stressors. The original watershed TMDLs and related limits adopted in 2001 established targets and actions for several pollutants; the 2012 Tualatin Subbasin TMDL updated and amended earlier limits for pH and chlorophyl a, redistributed allocations, and added a more comprehensive Water Quality Management and implementation framework to guide permits, monitoring, and on-the-ground projects. The Tualatin Subbasin TMDL Revision was approved by EPA on December 14, 2012.

TMDL Order Memo - Aug. 28, 2012

EPA Approval Letter

Fact Sheet: Working for Clean Water in the Tualatin River Subbasin
Executive Summary
Chapter 1: Overview and Background
Chapter 2: pH and Chlorophyll a (Total Phosphorus) TMDL; Amendment
Chapter 3: Amendment to 2001 Waste Load Allocations for; Ammonia Under 2001 Dissolved Oxygen TMDL for the Tualatin Basin
Chapter 4: Water Quality Management Plan
Appendix 2-A: Tualatin River Total Maximum Daily Loads: Total Phosphorus and Dissolved Oxygen Analysis for the Upper River Final Report
Appendix 2-B: Tualatin River Total Maximum Daily Loads for Total Phosphorus (4/20/2009) Phosphorus Control Period
Appendix 3-A: Changes to the 2001 Dissolved Oxygen TMDL for the Tualatin Basin

Response to Comments

Total Maximum Daily Load and Water Quality Management Plan
Appendix A: Temperature Technical Analysis
Appendix B: Bacteria Model Description
Appendix C: Supporting Documents for the Chlorophyll A/pH (Phosphorus) TMDL
Appendix D: Supporting Documents for the Dissolved Oxygen TMDL
Appendix E: Low pH Discussion
Appendix F: Tualatin Subbasin Fish Habitat and Fish Community Information
Appendix G: Toxics Discussion
Appendix H: Biological Criteria Discussion
Appendix I: Tualatin Subbasin Water Quality Management Plan

Response to Public Comment

Active Willamette Basin TMDLs: Tualatin Subbasin

2012 and 2001 Tualatin TMDL

2012 Tualatin TMDL and associated documents

2001 Tualatin TMDL and associated documents