Pennsylvania Water Science Center



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Bruce Lindsey
(blindsey@usgs.gov)

 

In cooperation with the Pennsylvania Department of Environmental Protection Bureau of Water Supply and Wastewater Management

Relation between Well-Construction Practices and Occurrence of Bacteria in Private Household-Supply Wells in Southeastern Pennsylvania

Highlights of Study

  • Water from 62% of the wells sampled were positive for total coliform.
  • Water from 10% of the wells sampled were positive for E. coli.
  • Total coliform were just as likely in water from sanitary (grouted) wells as they were in nonsanitary (nongrouted) wells.
  • E. coli were more likely in water from nonsanitary (nongrouted) wells
  • Carbonate aquifers are more vulnerable to bacteria contamination than noncarbonate aquifers.
  • Relations exist between the presence of total coliform bacteria and select well-construction characteristics.

well cap vs seal well cap
(click thumbnails for larger images)

Final Report WRIR 01-4206:

Relation Between Selected Well-Construction Characteristics and Occurrence of Bacteria in Private Household-Supply Wells, South-Central and Southeastern Pennsylvania

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