Vashon-Maury Island, WA
Vashon-Maury Island is located near the southern end of Puget Sound in the southwestern corner of King County, Washington. The Island covers an area of 36.7 square miles and its population has been estimated at approximately 7,800 persons.
Region 10 received a petition from the Seattle-King County Department of Public Health on April 2, 1992, which requested EPA to designate Vashon-Maury Island as a sole source aquifer.
EPA's review of the petition and other data determined that:
- The Vashon-Maury Island Aquifer System supplies approximately 71 percent of the drinking water to persons living on the Island;
- As the area's principal source of drinking water, contamination of the aquifer system would create a significant hazard to public health;
- The sole source aquifer boundary is coincident with the shoreline of the Island, and at depth includes all geologic units that can supply significant quantities of drinking water to wells;
The Island's glacial geologic deposits make the aquifer system vulnerable to contamination from a variety of activities occurring on the land surface.
- There are no reasonably available alternative sources of drinking water which could replace the aquifer system, should it become contaminated.
Designation (Federal Register - as proposed)
Sole Source Aquifer Maps
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