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Ecology Publications & Forms |
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Ecology Publications & Forms |
| Title | Greater Lake Washington Watershed PFAS Survey: Final Report |
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Greater Lake Washington Watershed PFAS Survey: Final Report (Number of pages: 181) (Publication Size: 35198KB)
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| Author(s) | Siana Wong, Diane Escobedo | ||||
| Description | From 2020 to 2023, The Washington State Department of Ecology conducted a study to assess sources and pathways of PFAS to Lake Washington, a large urban freshwater lake. The need for the study arose because of high levels of PFAS found in fish from the lake. The goal of the study was to characterize, identify, and prioritize the major pathways and sources of PFAS to Lake Washington. Samples collected represented lake and tributary surface water and sediments, groundwater, stormwater, bulk atmospheric deposition, suspended sediments, surface runoff, road dust, biofilm, and aquatic macroinvertebrates (caddisfly larvae). Total PFAS (sum of 40 analytes) concentration ranges included: • 11.6 – 23.8 ng/L in Lake Washington surface water • Non-detect – 139 ng/L in tributary surface water • Non-detect – 946 ng/L in groundwater • 13.3 – 115 ng/L in stormwater discharge • 0.906 – 16.9 ng/g in lake surface sediments • 0.0518 – 50.6 ng/g in tributary surface sediments • 0.159 – 10.9 ng/g in tributary suspended sediments • Non-detect – 11.0 ng/L in surface runoff • 0.305 – 19.0 ng/g in road dust • Non-detect – 10.8 ng/L in bulk atmospheric deposition • Non-detect – 0.852 ng/g in biofilm tissue • 0.790 – 0.884 ng/g in caddisfly larvae tissue Results overall showed that PFAS detections were widespread in the watershed, with largely diffuse sources and pathways of PFAS to the lake, and some localized areas with higher concentrations. Further assessments are needed to better understand the relative importance of different pathways, identify specific land use activities contributing to PFAS in the watershed, and address localized areas where higher PFAS levels were found. |
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The mission of the Department of Ecology is to protect, preserve, and enhance Washington’s environment. To help us meet that goal, please consider the environment before you print or request a copy.
ADA Accessibility The Department of Ecology is committed to providing people with disabilities access to information and services by meeting or exceeding the requirements of the Americans with Disabilities Act (ADA), Section 504 and 508 of the Rehabilitation Act, and Washington State Policy #188. Visit Ecology’s website for more information. |
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| Contact | EAP Publications Coordinator at 564-669-3028 or EAPpubs@ecy.wa.gov | ||||
| Keywords | PFAS, Lake Washington, Nonpoint Pollution, source assessment, Per- and polyfluoroalkyl substances (PFAS), pathway, toxics monitoring, tributaries, sampling, point source, pollution, non point, freshwater, fish consumption advisory, watershed health and monitoring, PFOS, per-and poly-fluoroalkyl substances | ||||
| WATERSHED | Water Resource Inventory Area 08 Cedar-Sammamish | ||||
| DATA | Environmental Information Management (EIM) #SWON0003 |
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