TABLE 2

Pathogenic Microorganisms Found in Well Water

BacteriaVirusesParasites
Escherichia coli, including O157:H7Norovirus, sapovirusGiardia intestinalis
Salmonella speciesRotavirusCryptosporidium
Shigella speciesEnterovirusesCyclospora
Campylobacter jejuniHepatitis A and EMicrosporidia
Yersinia enterocoliticaIsospora
Mycobacterium avium-intracellulareNaegleria fowleri