Title: Revised Willamette Basin Mercury
Water Quality Limited Parameters: Mercury
Pollutants: Methylmercury and Total Mercury
Status: EPA Disapproved Nov. 29, 2019, EPA Issued TMDL Dec. 30, 2019
In Sept. 2006,
EPA approved DEQ’s mercury TMDL for the entire Willamette Basin. DEQ developed
the TMDL to meet a mercury target in place at the time. Northwest Environmental
Advocates filed a lawsuit in 2012, which argued the validity of the mercury
TMDL and EPA’s approval of the TMDL. In April 2017, the US District Court
issued a ruling requiring EPA to revise the TMDL by April 2019, and allowing
the 2006 TMDL to remain in effect until EPA issues or approves the revised
TMDL. The court has since approved a DEQ and EPA extension request to Nov. 29,
Dec. 30, 2019
EPA established the Willamette Basin Mercury TMDL. EPA will open a public comment period for this TMDL from Jan. 6, 2020 through Feb. 4, 2020. EPA’s TMDL used some of Oregon’s 2019 TMDL, with the major changes being revisions of some of the load and wasteload allocations. Additional information about EPA’s public comment period will be posted by EPA on Jan. 6, 2020.
Oregon DEQ and the U.S. Environmental Protection Agency are working together to revise the 2006 Willamette Basin Mercury Total Maximum Daily Load to meet the fish tissue methylmercury criterion adopted in 2011. This criterion allows Oregonians to safely consume higher amounts of fish (Approximately 23 8-oz fish meals a month) caught in Oregon's waterways.
DEQ issued the Revised Willamette Basin Mercury TMDL on Nov. 22, 2019. On Nov. 29, 2019, EPA disapproved the TMDL). Under the Clean Water Act and implementing federal regulations, EPA has establish a new TMDL.
Main TMDL documents
For requesting data, models or other information used in this TMDL, please complete a "Public Records Request".
Advisory committee meetings
June 13, 2019: Agenda, Presentation, Meeting Minutes
April 26, 2019: Agenda, Presentation, Meeting Minutes
March 7, 2019: Agenda, Webinar Presentation (Courtesy of Tetra Tech), Webinar Submitted Questions
July 17, 2018: Agenda , Modeling Updates (Courtesy of Tetra Tech)
March 21, 2019: Agenda, Meeting Minutes
Sept. 19, 2018: Agenda, Willamette Mercury TMDL Modeling Results (Courtesy of Tetra Tech)
Aug. 22, 2018: Agenda , Willamette Mercury TMDL Technical Approach (Courtesy of Tetra Tech), Point Source Implementation Options
Feb. 15, 2018: Agenda, Presentation: TMDL Technical Approach (courtesy of Tetra Tech), Meeting minutes
Public hearing and request for comments