Skip to main content

Perspectives on Developing and Implementing the Willamette River Mercury TMDL

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial


In September 2006, the Oregon Department of Environmental Quality (ODEQ) finalized the first phase of a Total Maximum Daily Load (TMDL) for mercury in the Willamette River. This final version illustrates both the strengths and the weaknesses of the TMDL program in achieving improved water quality. The TMDL was prepared because fish tissue from several species of fish in the Willamette Basin exceeded the recommended mercury concentration of 0.35 milligrams per kilogram (mg/kg, wet weight), prompting the Oregon Department of Human Services (ODHS) to issue fish consumption advisories for the mainstem of the Willamette River, and for the Dorena and Cottage Grove Reservoirs. On the basis of these fish advisories, the Willamette River and tributaries were designated as impaired waters, and ODEQ prepared a TMDL to determine actions needed to address this impairment. Submitted to the U. S. Environmental Protection Agency on September 21, 2006 and approved 8 days later, the first phase of this TMDL will help to focus mercury reduction efforts on pathways leading to the aquatic environment, complimenting mercury reduction efforts that are currently dominated within DEQ by a solid waste perspective. The challenge to those moving forward to implement the TMDL is twofold. For National Pollutant Discharge Elimination System (NPDES) permittees, the challenge is to maintain the mercury reduction focus over several adaptive management cycles in the face of scientific uncertainty about how to achieve detectable improvement in the measures of water quality in the Willamette River. For sources of non-point pollution, the challenge is to increase their pace of action toward measurable achievements in mercury load reduction, also in the face of uncertainty. After setting the framework for mercury reduction plans, ODEQ will ask for implementation plans for this TMDL required of NPDES permitted discharges to be finalized within 12 months. Directions will be set for obtaining technical information to substantiate the second phase of the TMDL scheduled to be developed in 201l. Strategies for compliance and mercury reduction being promoted by municipal dischargers in Oregon will be useful models for others facing similar TMDL challenges.


Document Type: Research Article


Publication date: 2007-10-01

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Learn about the many other WEF member benefits and join today
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more