Prior to downloading data, please download the README file.

This dataset contains water quality samples collected from Puget Sound, lakes, and streams in the region which can be filtered by "Site Type" and "Area".

To see where water quality samples are collected, see the WLRD Water Quality Collection Sites dataset.

Search for Hydrology data by parameter, for a specified site.

Search for hydrologic data across sites, by a specified parameter.

Welcome to the Lakes Data and Descriptions application! Use this application to search, view, and download water quality data resulting from volunteer monitoring efforts at more than 50 lakes in western King County. Choose a lake by location on the map below or by name on the list next to the map. For a synopsis of data and a discussion of long term trends among all small lakes of western King County, view the current regional assessment on the reports page.

The King County Groundwater Protection Program maintains a database of groundwater wells, water quality and water level sampling data. Users may search the database using Quick or Advanced Search OR use King County Groundwater iMap map set.

Search for King County well data by Well ID, Local Number, DoE Well Tag, or Parcel Number.

We are committed to monitoring the water quality of the County's lakes to ensure their continued health, as well as the health of the public who utilize the lake's many resources. We invite you to learn more about our program by looking through the pages listed on the left. This site contains detailed graphs of water quality data, photographs of water sampling, and general information about the water quality of King County's lakes.

Data collected from lake monitoring buoys throughout King County

This dataset contains water quality samples collected from Puget Sound, lakes, and streams in the region which can be filtered by "Site Type" and "Area".

To see where water quality samples are collected, see the WLRD Water Quality Collection Sites dataset.

Data taken from multiple depths in King County bodies of water.

Interactive map of current freshwater swimming beach sampling stations in King County, and downloadable data.