water

Groundwater Assessment

Locally-based Groundwater Information

Watershed planning groups often evaluate groundwater as part of locally-based water resource management efforts. To see if there's a planning group in your area, go to Watershed Planning in Washington. The website for Wellowner.org has helpful information related to groundwater and private water well systems, including tips on maintaining and testing your domestic well.

County agencies or partnerships can also be a good source of information about local groundwater conditions. Local health departments can provide helpful guidance on siting and maintaining water-supply wells and often provide a water-testing service if you're concerned about the quality of the water in your domestic well (usually focused on nitrates, bacteria, and, in some counties, arsenic). Here is a list of links for many of these local programs:

Adams County Environmental Health Services

Benton-Franklin County Health District Drinking Water Program

Chelan-Douglas County Health District Drinking Water Program

Clallam County Drinking Water Program

Clallam County Groundwater Quality Studies

Clark County Drinking Water Program

Columbia Basin Groundwater Management Area

Cowlitz County Environmental Health Drinking Water Program

Cowlitz County Environmental Health Unit - Water Wells

Garfield County Environmental Health Services Drinking Water Program

Grant County Health District Environmental Health Programs

Grays Harbor County Drinking Water and Wells Information

Island County Environmental Health Drinking Water Program

Island County Environmental Health Department Hydrogeology Program

Jefferson County Drinking Water Program

King County Public Health Drinking Water Program

King County Groundwater Management Program

Interactive database for King County Groundwater Data

King County Groundwater Maps and Reports

Kitsap County Health Department Drinking Water Program
See also: Bainbridge Island Groundwater Management Program

Kittitas County Drinking Water Program

Klickitat County Drinking Water Program

Lewis County Public Health Drinking Water Program

Lewis County Water Laboratory Program

Lincoln County Drinking Water Information

Mason County Wells and Drinking Water Program

Okanogan County Public Health Drinking Water Program

Pacific County Environmental Health Division Well Information

Pacific County Water Sampling Program

Tacoma-Pierce County Health Department Drinking Water Program

Tacoma-Pierce County Water Quality Program

South Tacoma Groundwater Protection District

San Juan County Drinking Water Program

San Juan County Water Resource Management

Skagit County Environmental Health Drinking Water Program

Skamania County Drinking Water Program

Snohomish County Environmental Health Division Drinking Water Program

Snohomish County Ground Water Management Program

Spokane Regional Health District Environmental Public Health

Spokane County Groundwater Monitoring Program

Spokane Aquifer Joint Board

Thurston County Health Department Drinking Water Program

Thurston County Groundwater Monitoring Data

Thurston County Special Groundwater Monitoring Projects

Walla Walla County Environmental Health Program

Whatcom County Health Department Drinking Water Program

Whitman County - Palouse Basin Aquifer Committee (Pullman, WA/Moscow, ID)

Whitman County Environmental Health Program

Yakima County Health District Drinking Water Program

Lower Yakima Valley Groundwater Management Area

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If you have any suggestions about additional resources to add to this page, please contact: Kirk Sinclair (kirk.sinclair@ecy.wa.gov).