On December 4, 2005, a petition was formally submitted to the Environmental Protection Agency (EPA), Region 10, Seattle, requesting that agency to designate the Troutdale and Unconsolidated Alluvium Aquifer System in Clark County, Washington, as a Sole Source Aquifer. The EPA defines the Sole Source Aquifer Program as a tool used to protect drinking water supplies in areas with few or no alternative sources to groundwater resources, and where if contamination occurred, using an alternative source for the potable water supply would be extremely expensive.
To qualify for Sole Source Aquifer designation, the proposed aquifer service area must prove to be at least 50% dependent on groundwater for the potable water supply. Factual analysis shows that 99.4% of the potable water currently used in the proposed Sole Source Aquifer service area in Clark County is obtained from groundwater, confirming that the Troutdale Aquifer System qualifies as a Sole Source Aquifer.
To view the Petition click here.
