Surface Water Health

Watershed Health Monitoring Data


We have a surface water quality monitoring program to assess watershed health. A watershed is an area of land where all the water that is under it or on it drains to the same place. The four major watersheds in Pierce County drain to Puget Sound. Pierce County regularly monitors water quality in all four watersheds. Want to know where the water from your neighborhood goes? Check out Where Does Your Water Go.

Surface water monitoring includes:

Web-Based Tool to Monitor Stream Health Data


Access stream and shellfish monitoring data we collect and analyze.

How Streams Get Their Grades


We issue an annual Surface Water Health Report Card on the health of surface water quality in each major watershed. The report card grades a number of streams on a scale of "A" to "F" based on a combination of WQI scores and BIBI scores. These factors combined provide a realistic overall understanding of stream health, and help direct our clean up efforts. The report card also includes an assessment of some lakes in the county.

View most recent report card | View all report cards

Additional Resources


  • Puget Sound Benthos Database
  • Washington's 2020 Clean Water Plan
  • Final Interagency Project Report
  • Glossary of terms for water quality
  • Contact Us
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    Carla Vincent
    Water Quality Scientist
    Phone: (253) 798-2467
    Fax: (253) 798-4225
    Monday-Friday
    7:30 a.m.–4:00 p.m.

    Mailing Address:
    2702 S 42nd St, Ste 201
    Tacoma, WA 98409-7322