- Overview of the ERAGS process
- Data requirements in an ecological risk assessment
- Development of lines of evidence
- Matrix sampling
- Biological surveys
- Benthic invertebrate surveys
- Toxicity testing
- Food chain modeling
- Development of weight-of-evidence risk conclusions
- Preparation of the ecological risk assessment
Planned Maintenance — August 8-9, 2026
We will be performing scheduled website maintenance this weekend. During this time, the site may be temporarily unavailable.
We appreciate your patience. If you need to register for a course or have questions, please contact us at info@nwetc.org or 425-270-3274.







