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This Groundwater management area encompasses nearly 260 square miles mostly within of the Green-Duwamish Watershed. The boundaries from north to south are West Seattle to Federal Way and Pierce County. This area is bounded on the west by Puget Sound and Black Diamond to the east.

South King County Groundwater Management Area Map

The focus of the residential, commercial and industrial land uses are within the cities of Algona, Auburn, Black Diamond, Burien, Covington, Des Moines, Federal Way, Kent, Maple Valley, Milton, Normandy Park, Pacific, Renton, Seatac, Seattle, and Tukwila. The remainder of the management area outside the cities' limits has low density residential, neighborhood oriented commercial, forest and agricultural land uses.
The majority of the water used for private, municipal, and industrial and agricultural purposes in the South King County Groundwater Management Area is provided by groundwater sources.

Groundwater Data


South King County Groundwater Management Plan

Water Suppliers in South King County

This Groundwater Management Area has 42 Group A and 441 Group B Public Water Systems. The majority of the residents in this GWMA are serviced by the following Water Utility Service areas:

Algona KC Water District 20 Pacific
Auburn KC Water District 49 Renton
Black Diamond KC Water District 54 Seattle
Cedar River KC Water District 111 Soos Creek
Covington KC Water District 125 Tacoma
Highline Lakehaven Tukwila
Kent Milton  

This page is produced by the King County Groundwater Protection Program. To learn more about this group and its responsibilities, please read about the Groundwater Protection Program.