Water Quality photo identifier

Water Quality Program

Ground and Surface Water Quality Information

Water quality standards provide protection and preservation of the waters of the state.

Along with regulations, monitoring helps Ecology to keep track of how well water cleanup plans and best management practices are working to help water bodies meet and maintain water quality standards. Water reclamation and reuse helps Washington efficiently use its waters.

Water Quality Standards

Ground Water Quality Information
Information on the Ground Water Quality Standards and implementation for the State of Washington.

Surface Water Quality Standards
Numeric standards and designated uses for surface waters that protect beneficial uses in the water by setting pollution limits, and provide goals for water clean-up projects.

Water Quality Monitoring Information

Ecology monitors water quality in streams; rivers; and other water bodies for a number of reasons. Some monitoring provides data on the condition of a water body and establishes trends in its environmental health. Monitoring also tracks the success and usefulness of best management practices (BMPs) for water cleanup. Monitoring is also used to determine whether water bodies are meeting state water quality standards.

Unless otherwise stated the following links are from the Environmental Assessment Program.

Environmental Conditions and Trends

River and Stream Water Quality Monitoring

Rivers and Streams

Rivers and Streams - Annual Water Quality Reports

Water Quality Monitoring Studies Bibliography

Whole Effluent Toxicity (WET) Testing (Water Quality Program)
WET tests are required in some wastewater discharge permits in order to measure the potential toxicity of effluents to the rivers, lakes, bays, and ocean waters of the state. WET testing is sometimes called "biomonitoring" or "bioassay testing."