Source Water Assessment Program (SWAP)
Under provisions of the Safe Drinking Water Act, states
are required to develop comprehensive Source Water Assessment Programs
that identify the watersheds that supply public tap water, provide
an inventory of contaminants present in the watershed, and assess
susceptibility to contamination in the watershed. Source water assessments
for the Water Authority’s watersheds were conducted by the
Virginia Department of Health. Based on the criteria developed by
the state, the Potomac River and the Occoquan Reservoir were determined
to be of high susceptibility to contamination. This determination
is consistent with the state’s finding of other surface waters
(rivers, lakes, streams) throughout the Commonwealth of Virginia.
The assessment consists of maps of the watershed
area that was evaluated, an inventory of known land use activities,
and documentation of any known source water contamination within
the last five years.