Data generated from the detection of Cryptosporidium oocysts and Giardia cysts in 463 groundwater samples were compiled.
Samples were taken from 199 sites in 23 of the 48 contiguous states.
The groundwater sources were vertical wells, springs, infiltration galleries, and horizontal wells.
Samples were analyzed using an immunofluorescence technique.
Inclusion of data from all sources showed that 12 percent of the sites were positive for Cryptosporidium or Giardia or both.
Cryptosporidium oocysts were found in 5 percent of the vertical wells, 20 percent of the springs, 50 percent of the infiltration galleries, and 45 percent of the horizontal wells.
Giardia cysts were found in 1 percent of the vertical wells, 14 percent of the springs, 25 percent of the infiltration galleries, and 36 percent of the horizontal wells.
These data suggest that springs are at a higher risk for contamination than vertical wells.
Because pathogens occur frequently in infiltration galleries and horizontal wells, these sources warrant further study.
Mots-clés Pascal : Pollution eau, Eau souterraine, Etats Unis, Amérique du Nord, Amérique, Eau potable, Résultat mesure, Qualité eau, Oocyste, Kyste, Cryptosporidium, Apicomplexa, Protozoa, Giardia
Mots-clés Pascal anglais : Water pollution, Ground water, United States, North America, America, Drinking water, Measurement result, Water quality, Oocyst, Cyst, Cryptosporidium, Apicomplexa, Protozoa
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 98-0200728
Code Inist : 001D16A04B. Création : 11/09/1998.