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Defined as “the area where the impacts to drinking water from point and nonpoint sources of contamination can be minimized by preventive management.” This area was delineated to protect water users from long-term (chronic) health effects related to low levels of chemical contamination or the periodic presence of contaminants at low levels in the surface water used by the PWS. Criteria considered in defining this area included:
o Delineation of the outer source water management area is based on time of travel to respond to a potential contaminant threat and should consider the following criteria:
o contaminants or potential contamination sources that the public water supplier feels present a risk to the water supply;
o existing water resource management/protection programs that have identified areas of concern within a watershed or types of potential contamination sources that are of concern for overall water quality;
o the general types of land uses and contaminant sources believed to exist within the watershed, including the existence of major transportation routes (e.g., highways, bridges and railways) and pipelines;
o minor watershed boundaries within the watershed; topography; man-made and natural drainage patterns; wetlands or other contaminant attenuation features; and hydrology, including lakes, dams, etc.; and
o physical and chemical attributes of the source water being used. |