Abstract
Those who drink groundwater that has not been disinfected are at increased risk of infection and disease from pathogenic microorganisms. Recent stud- ies have shown that up to half of all US drinking- water wells tested had evidence of fecal contamination. A significant fraction of all waterborne disease outbreaks is associated with groundwater. An estimated 750,000 to 5.9 million illnesses per year result from contaminated groundwaters in the US. Mortality from these illnesses may be 1400-9400 deaths per year. Control of these pathogens starts with source-water protection activities to prevent fecal contamination of aquifers and wells. These include assessment of wellhead vulnerability to fecal contami- nation and correction of identified deficiencies. Cor- rection may include control of sources or rehabilitation of the well itself. Disinfection can serve as a useful barrier and is recommended as a prudent public-health policy for all groundwater systems.
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