Oregon Department of Agriculture Tualatin River Watershed Agricultural Water Quality Management Area Plan March 2018 Developed by the Tualatin River Watershed Local Advisory Committee Oregon Department of Agriculture With support from the Tualatin Soil and Water Conservation District Tualatin River Watershed Management Area Contacts: Oregon Department of Agriculture Natural Resource Programs 635 Capitol Street NE Salem, OR 97301 (503) 986-4700 ODA Tualatin River Watershed Agricultural Water Quality Specialist Office: (503)-986-5141 Website: www.oregon.gov/ODA/programs/NaturalResources/Pages/Default.aspx Online Link to Area Plan: www.oregon.gov/ODA/programs/NaturalResources/AgWQ/Pages/AgWQPlans.aspx Tualatin Soil and Water Conservation District 7175 NE Evergreen Parkway #400 Hillsboro, Oregon 97124 (503) 334-2288 Website: www.swcd.net Table of Contents Acronyms and Terms Used in this Document ............................................................................................... i Foreword .................................................................................................................................................................. ii Required Elements of Area Plans .................................................................................................................... ii Plan Content ............................................................................................................................................................ ii Chapter 1: Agricultural Water Quality Management Program Purpose and Background ....... 1 1.1 Purpose of Agricultural Water Quality Management Program and Applicability of Area Plans ........................................................................................................................................................... 1 1.2 History of the Ag Water Quality Program ................................................................................. 1 1.3 Roles and Responsibilities .............................................................................................................. 2 1.3.1 Oregon Department of Agriculture ........................................................................................................ 2 1.3.2 Local Management Agency ........................................................................................................................ 3 1.3.3 Local Advisory Committee ......................................................................................................................... 5 1.3.4 Agricultural Landowners ........................................................................................................................... 5 1.3.5 PuBlic Participation ...................................................................................................................................... 6 1.4 Agricultural Water Quality ............................................................................................................. 6 1.4.1 Point and Nonpoint Sources of Water Pollution............................................................................... 6 1.4.2 Beneficial Uses and Parameters of Concern ....................................................................................... 6 1.4.3 Impaired Water Bodies and Total Maximum Daily Loads ............................................................ 7 1.4.4 Oregon Water Pollution Control Law – ORS 468B.025 and ORS 468B.050 .......................... 7 1.4.5 Streamside Vegetation and Agricultural Water Quality ................................................................ 8 1.5 Other Water Quality Programs ..................................................................................................... 9 1.5.1 Confined Animal Feeding Operation Program .................................................................................. 9 1.5.2 Groundwater Management Areas......................................................................................................... 10 1.5.3 The Oregon Plan for Salmon and Watersheds ................................................................................. 10 1.5.4 Pesticide Management and Stewardship ........................................................................................... 10 1.5.5 Drinking Water Source Protection ....................................................................................................... 11 1.5.6 Oregon’s Coastal Management Program and the Coastal Zone Management Act ReauthoriZation Amendments of 1990 .............................................................................................................. 11 1.6 Partner Agencies and Organizations ........................................................................................ 11 1.6.1 Oregon Department of Environmental Quality ............................................................................... 11 1.6.2 Other Partners .............................................................................................................................................. 12 1.7 Measuring Progress ........................................................................................................................ 12 1.7.1 MeasuraBle OBjectives ......................................................................................................................... 12 1.7.2 Land Conditions and Water Quality..................................................................................................... 13 1.7.3 Focused Implementation in Small Geographic Areas ................................................................... 14 1.8 Monitoring, Evaluation, and Adaptive Management ........................................................... 14 1.8.1 Agricultural Water Quality Monitoring .............................................................................................. 15 1.8.2 Biennial Reviews and Adaptive Management ................................................................................. 15 Chapter 2: Local Background ........................................................................................................................ 17 2.1 Local Roles .......................................................................................................................................... 17 2.1.1 Local Advisory Committee (LAC).......................................................................................................... 17 2.1.2 Local Management Agency ...................................................................................................................... 17 2.2 Geographical and Physical Setting ............................................................................................. 18 2.2.1 Tualatin River Watershed Overview ................................................................................................... 18 Water Resources ............................................................................................................................................. 22 2.3 Water Quality .................................................................................................................................... 23 2.3.1 Local Issues of Concern ............................................................................................................................. 23 2.3.2 Beneficial Uses .............................................................................................................................................. 24 2.3.3 303(d) List of Impaired Water Bodies ................................................................................................ 24 2.3.4 Total Maximum Daily Loads (TMDL) and Agricultural Load Allocations ............................ 25 Load Allocations ............................................................................................................................................. 26 2.4 Prevention and Control Measures ............................................................................................. 27 2.4.1 Voluntary Measures ................................................................................................................................... 27 2.4.2 Required Conditions .................................................................................................................................. 28 2.4.3 Erosion ............................................................................................................................................................. 28 2.4.4 Streamside Vegetation .............................................................................................................................. 29 2.4.5 Irrigation Water Discharges ................................................................................................................... 29 2.4.6 Nutrients ........................................................................................................................................................ 30 2.4.7 Waste ................................................................................................................................................................ 30 2.4.8 Complaints and Investigations .............................................................................................................. 31 Chapter 3: Goals, Objectives, and Strategies ..........................................................................................