Water Quality Assessment (303[d]) & Water Quality Improvement
Water Quality Assessment (303[d])
The Water Quality Assessment lists the water quality status for a particular location in one of 5 categories recommended by EPA. The assessment represents the Integrated Report for Sections 303(d) and 305(b) of the Clean Water Act.
Water Quality Improvement
This website provides information to help residents, stakeholders, and policy makers understand the complex issues around improving water quality, find out what Ecology is doing to clean up our waters, and help each person learn what they can do to help keep our rivers, lakes, and marine waters clean.
Data Quality Assurance
Information on water quality data assurance - what it is, why it is important, and what the State of Washington is doing to support quality assurance of water quality data.
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