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Ter Quality Program Home | WA Dept. of Ecology. Ter Quality Improvement Projects for Snohomish County | WA State Department of Ecology. Water Quality Improvement > Water Quality Improvement Projects by County > Snohomish County The following table lists overview information for water quality improvement projects (including total maximum daily loads, or TMDLs) for this county. Please use links (where available) for more information on a project. To get additional information about the water bodies in Snohomish County please use the Water Quality Assessment Query Tool. WRIAs in Snohomish County WRIA 3 - Lower Skagit-SamishWRIA 4 - Upper SkagitWRIA 5 - StillaguamishWRIA 7 - SnohomishWRIA 8 - Cedar-Sammamish.