Skip to main content
U.S. flag

An official website of the United States government

Here’s how you know

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

HTTPS

Secure .gov websites use HTTPS
A lock (LockA locked padlock) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

    • Environmental Topics
    • Air
    • Bed Bugs
    • Cancer
    • Chemicals, Toxics, and Pesticide
    • Emergency Response
    • Environmental Information by Location
    • Health
    • Land, Waste, and Cleanup
    • Lead
    • Mold
    • Radon
    • Research
    • Science Topics
    • Water Topics
    • A-Z Topic Index
    • Laws & Regulations
    • By Business Sector
    • By Topic
    • Compliance
    • Enforcement
    • Laws and Executive Orders
    • Regulations
    • Report a Violation
    • Environmental Violations
    • Fraud, Waste or Abuse
    • About EPA
    • Our Mission and What We Do
    • Headquarters Offices
    • Regional Offices
    • Labs and Research Centers
    • Planning, Budget, and Results
    • Organization Chart
    • EPA History

Breadcrumb

  1. Home
  2. Water Quality Criteria

Bioassessment and Biocriteria Program Status for Oregon: Streams and Wadeable Rivers

Related Information

Information on Bioassessment and Biocriteria Programs for Streams and Wadeable Rivers

State Program Contact

Oregon Department of Environmental Quality


Water Quality Standards

WQS Information

The link to Oregon's WQS that are in effect for Clean Water Act purposes is provided. These are the WQS approved by the U.S. Environmental Protection Agency.

  • Water Quality Standards Regulations: Oregon

The state of Oregon provided information and links to sections of their administrative code on designated aquatic life use, biological criteria, antidegradation, as well as technical support documents and information on its bioassessment and biocriteria programs. These are included for your convenience and may or may not reflect the most recently EPA-approved WQS.

  • Water Quality Standards: Beneficial Uses, Policies, and Criteria for Oregon

Designated Aquatic Life Uses

They vary by basin and include:

  • Salmon and Steelhead Migration Corridors
  • Salmon and Steelhead Spawning through Fry Emergence
  • Shad and Sturgeon Spawning and Rearing
  • Redband or Lahontan Cutthroat Trout
  • Cool Water Species (No Salmonid Use)
  • Redband and Hybrid Trout
  • Lahontan Trout
  • Borax Lake Chub
  • Bull Trout Spawning and Juvenile Rearing
  • Core Cold Water Habitat
  • Salmon and Trout Rearing and Migration

Biological Criteria

__X__ Narrative, with quantitative implementation procedures or translators
_____ Numeric
_____ No criteria

340-041-0011 Biocriteria
Waters of the State must be of sufficient quality to support aquatic species without detrimental changes in the resident biological communities.

Antidegradation Policy

Use of biocriteria or bioassessment not included in antidegradation policy.


Biological Assessment

What biological assemblages are used in the bioassessment program?
Benthic macroinvertebrates, fish, and amphibians

Are bioassessments used to support 303(d) listings?
Yes. Listing methodology: Methodology for Oregon’s 2018 Water Quality Report and List of Water Quality Limited Waters (pdf)

How are assemblages used to make impairment decisions?
Only macroinvertebrate data is used to make impairment decisions.

Other uses of biocriteria or bioassessment within the water quality program:
TMDL development and assessment, non-point source assessments, BMP evaluation, 305(b) surface water condition assessments, and restoration goals


Technical Support Information and Documents

Reference condition

The paper describes the approach the Oregon DEQ Watershed Assessment Section uses to select reference condition sites. The purpose of selecting reference condition sites is to establish an objective and systematic method for finding water bodies minimally disturbed by human activities.

Technical reference material

  • Selecting Reference Condition Sites: An Approach for Biological Criteria and Watershed Assessment (pdf)
  • Reference Condition Approach 2020: An Updated Water Quality Monitoring Approach to Defining Least Disturbed Areas (pdf)

Biocriteria

Development of biocriteria involves the collection and interpretation of biological data –e.g. benthic macroinvertebrates, fish, and periphyton. During this process entities typically use biological metrics (usually aggregated into a multimetric index) and/or multivariate analysis to assess whether a waterbody is meeting its designated aquatic life use(s). The reference materials include standard operation procedures used in data collection, compilation, technical approaches used to develop biocriteria as well as its implementation procedures.

Technical reference material

  • PREDATOR: Development and use of RIVPACS-type macroinvertebrate models to assess the biotic condition of wadeable Oregon streams (November 2005 models) (pdf)
  • DEQ Water Quality Standards & Assessment Interactive Viewer

Stressor identification/causal analysis approach

Not applicable.

Water Quality Criteria

  • Aquatic Life Criteria Table
  • Human Health Criteria Table
  • Human Health Toxics Criteria and Methods
  • Recreational Criteria and Methods
  • Aquatic Life Toxics Criteria and Methods
  • Nutrient Water Quality Criteria
  • Biological Water Quality Criteria
  • Other Aquatic Life Water Quality Resources
Contact Us about Water Quality Criteria
Contact Us to ask a question, provide feedback, or report a problem.
Last updated on March 11, 2025
  • Assistance
  • Spanish
  • Arabic
  • Chinese (simplified)
  • Chinese (traditional)
  • French
  • Haitian Creole
  • Korean
  • Portuguese
  • Russian
  • Tagalog
  • Vietnamese
United States Environmental Protection Agency

Discover.

  • Accessibility Statement
  • Budget & Performance
  • Contracting
  • EPA www Web Snapshot
  • Grants
  • No FEAR Act Data
  • Plain Writing
  • Privacy
  • Privacy and Security Notice

Connect.

  • Data
  • Inspector General
  • Jobs
  • Newsroom
  • Regulations.gov
  • Subscribe
  • USA.gov
  • White House

Ask.

  • Contact EPA
  • EPA Disclaimers
  • Hotlines
  • FOIA Requests
  • Frequent Questions
  • Site Feedback

Follow.