Studies of Microbiological Contaminants in surface and ground water in Pennsylvania From 1993 to the present, the USGS Pennsylvania Water Science Center has conducted several studies of microbiological quality of water. The study topics range from contamination of private well water to recreational water quality in lakes. Each of these studies has provided important information to resource managers, helping them understand the factors affecting occurrence and transport of microbiological contaminants in the hydrologic system. This summarizes the studies that have been conducted, and the relevant findings of those studies. CONTACTS: Lower Susquehanna River Basin (NAWQA) (Bruce Lindsey blindsey@usgs.gov) Viruses in water from wells used for noncommunity supply (Bruce Lindsey blindsey@usgs.gov) Relation between Well-Construction Practices and Occurrence of Bacteria in Private Household-Supply Wells in Southeastern Pennsylvania (Tammy Zimmerman tmzimmer@usgs.gov) Blue Marsh Lake (Michele Zimmerman mlzimmer@usgs.gov) Helicobacter pylori (Michele Zimmerman mlzimmer@usgs.gov) PROJECTS & ON-LINE REPORTS: Lower Susquehanna River Basin (NAWQA) Viruses in water from wells used for noncommunity supply Relation between Well-Construction Practices and Occurrence of Bacteria in Private Household-Supply Wells in Southeastern Pennsylvania Blue Marsh Lake bacteria source identification pilot project (ongoing project) Helicobacter pylori Bacteria in the Brandywine Creek Watershed

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