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DEQ Laboratory releases Willamette River Basin Water Toxics Summary

Oregon Willamette Basin

If you have been wondering if the Willamette River Basin is safe for swimming, the overall answer is yes. However, whether or not the river is pollutant-free, requires more of a deeper dive.

This week, the Oregon Department of Environmental Quality released the Willamette Basin Toxics Monitoring Summary. It combines water, sediment and tissue sampling results from DEQ’s Toxics Monitoring Program in the Willamette River Basin from 2008 to 2010 and 2016. The goals of the assessment are as follow:

Clockwise above from upper left: DEQ’s Kara Goodwin collecting a sediment sample, crayfish collected in the Willamette River, DEQ’s Dan Brown collecting crayfish, sampling bottles and gear for a water collection.

Between the two studies included in the summary, 238 samples were collected from 47 monitoring locations. They were analyzed for various chemical groups, including current-use and legacy pesticides, consumer-use products, combustion by-products, dioxins and furans, flame retardants, industrial chemicals, PCBs and metals. The monitoring locations were divided into three sub-basins (Lower, Mid and Upper) to give attention to the diverse regions of the Willamette Basin.

In 2016, water samples were collected three times (spring, summer and fall), while sediment and tissue samples were collected once. Also, tissue samples, crayfish and mussels were collected to help gain an accurate picture of the environment at each sampling location.

Sub-basin Findings

Click here to see full infographic on findings.

Key findings in the sub-basins include:

Lower

Mid

Upper

Based on the results of this study, 11 monitoring locations were selected to become part of the Toxics Monitoring Program’s trend network. It consists of 60 monitoring sites across the state, representing each major river basin, as well as locations with elevated concentrations of chemicals of concern and background locations. DEQ’s Laboratory will collect water samples at these sites three times annually. Sediment and tissue samples will be collected once annually. All sampling depends on Lab resources and approval to travel during the pandemic.

Additionally, the results from the summary will be used to inform several existing DEQ efforts, including the DEQ Integrated Toxics Reduction Strategy, the Integrated 303 (b) and (d) Reports for the federal Clean Water Act, and Total Maximum Daily Load, National Pollution Discharge Elimination System and stormwater permitting and regulatory programs. This will ensure that the waters of the Willamette River Basin continue to meet water quality standards and are safe places for people to recreate.

Click here see the monitoring summary infographic

— Dan Brown, water quality assessment specialist

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